Learning to fly means learning to make a lot of calculations: wind correction angle, groundspeed, crosswind component, and so much more. The old school way to do that is with a manual E6B, often called the “whiz wheel.” Newer electronic models are much easier to use, and are still allowed on FAA tests. In this video, learn how to perform some of the most common calculations on Sporty’s popular Electronic E6B Flight Computer.
https://media.flighttrainingcentral.com/wp-content/uploads/2018/09/05173657/Screen-Shot-2018-09-10-at-1.46.42-PM.png427782studentpltnewshttps://media.flighttrainingcentral.com/wp-content/uploads/2025/09/17092615/FTC_Redesign_2025_WhiteRed_WEB.pngstudentpltnews2018-09-13 09:58:192022-01-26 14:43:20How to use Sporty’s E6B Flight Computer
I had the pleasure of hosting a popular online panel discussion earlier this year featuring designated pilot examiners (DPEs) and Chief Instructors from around the country offering advice and insight on how to effectively prepare for, and pass, the checkride. If you haven’t had the opportunity to view it, the recording is available free (see below) and would be well worth your time, especially if you have an upcoming exam. Test anxiety is the norm rather than the exception, and the advice from this experienced panel will do wonders at calming the nerves. It also will help you identify common weaknesses of pilot applicants.
During some of the offline preparation and discussion, as the group haggled over busy schedules, the topic of commonly misunderstood procedures and regulations sparked strong opinions among the group. The topics mentioned could be classified into three categories: non-towered airport operations, equipment lists, and night operations.
Non-towered Airport Operations
Perhaps due to the volume of training taking place at towered airports, or due to non-standard practices at non-towered airports, DPEs tend to agree that non-towered airport operations are a source of confusion, and for the most part, lack standardization. The Aeronautical Information Manual (AIM) provides very specific guidance on traffic pattern operations as well as recommended communication procedures. Additionally, Advisory Circular 90-66, Non-Towered Airport Flight Operations, was updated just this year to provide even greater clarity.
Pattern Entry – Enter the pattern in level flight, at a 45-degree angle abeam the midpoint of the runway, at pattern altitude (1,000’ AGL is standard). Maintain pattern altitude until abeam the approach end of the landing runway on downwind leg. If you happen to be approaching the airport on the opposite side of the downwind leg, an accepted alternate entry method is to enter crosswind over midfield and turn downwind directly.
If the pattern is congested when approaching from the opposite side of the field, and it is not advisable to enter directly, it is then recommended to overfly midfield AT LEAST 500’ above pattern altitude and, when clear of the downwind leg, to make a descending turn to join the downwind leg using a standard 45-degree entry. This method requires extreme vigilance to avoid other traffic that also could be approaching for a standard pattern entry.
When approaching the airport from the opposite side of downwind, consider entering crosswind directly over midfield.
Pattern Departure – Continue to track the runway centerline and depart the pattern straight out, or exit with a 45-degree turn, based on ground track, in the direction of the pattern. In other words, the 45-degree turn should be made to the left if the runway has a left-hand pattern and, conversely, to the right if a right-hand pattern is in use. It is recommended to climb at least 500’ above the traffic pattern before completing departure procedure and initiating a turn on course.
Communication – When departing an airport, make an advisory call prior to taxi (include where you are and where you are going) and again before taking the runway for departure (include direction of flight). When inbound to a non-towered airport, make an advisory call 10 miles from the airport with your position and intentions and do so again when entering the downwind, base and final legs. Another call should be made once you have vacated the runway so departing traffic is aware that the runway is clear. Keep it simple, brief and informative as in, “Clermont County Traffic, Skyhawk Three Uniform Charlie, left downwind, Runway 22, Clermont County.”
Adhering to these standard practices is vitally important to avoiding collisions and ensuring pilots have consistent expectations throughout our airspace. While common sense should prevail and slight modifications may be necessary, especially in a particularly congested traffic pattern, pilots should routinely practice these standard procedures.
Equipment Lists
Inoperative equipment ultimately requires the PIC’s determination whether the flight may be conducted.
Pilots are notorious for confusing themselves when it comes to required functioning equipment aboard the airplane. The first rule is that all equipment should be functioning; if it is not, it’s right to be cautious and skeptical as to your ability to conduct your flight safely. If you do make an initial determination that a flight may be conducted safely with non-functioning equipment, refer to FAR 91.213, Inoperative instruments and equipment, as your governing source.
FAR 91.213 first references a Minimum Equipment List (MEL) for potential relief from instruments or equipment not in working order. Most likely, small, training aircraft do not have a MEL. It is in flying large, turbine aircraft or aircraft used in airline operations that one would encounter a MEL. MELs must be physically aboard the aircraft and must be individually approved by the FAA. A MEL includes a detailed listing of instruments, equipment and procedures that allow an aircraft to be operated under specific conditions with inoperative equipment and is often developed by the aircraft manufacturer.
Instead, most flight training aircraft are governed by 91.213 (d), which allows for small, piston-powered aircraft (such as Skyhawks, Cherokees and Cirrus) to be operated with certain inoperative equipment as long as that equipment is not required as part of the aircraft’s certification (airworthiness certificate), not required by the manufacturer in the Kinds of Operation Equipment List, and/or not required by some other regulation or directive.
Should you encounter a piece of equipment that is inoperative and wish to investigate further as to whether the aircraft may still be operated, consult the Equipment List provided in Section 6 (Weight and Balance) of the Pilot Information Manual. If the equipment is required by the manufacturer, your investigation is finished–you can’t fly. If the equipment is not required, you should inquire as to whether some other regulation may apply and ultimately, whether you, the PIC, determine the flight can be conducted safely.
During discussions of necessary equipment or inoperative equipment, pilots commonly get confused by what is provided in FAR 91.205, which is an inventory of the bare essential items required for Day/Night VFR and IFR flight. It is good practice to be familiar with the equipment listed in 91.205, but it also is safe to assume that a manufacturer is NOT going to list a piece of equipment as optional if it is included here. In other words, the manufacturer’s list and your own common sense should prevent you from attempting any operation in violation of the bare minimum equipment provided in FAR 91.205.
Night definitions
If it’s dark, turn your lights on and stay night current.
When it comes to logging night experience, illuminating navigation lights when required, or obtaining currency for night operations with passengers, many pilots confuse the various definitions.
Logging night time – Night time is the end of evening twilight to beginning of morning twilight. If there is a hint of daylight in the air, you have not reached the time period when you would log night time.
Lights on – From sunset to sunrise, your position lights need to be illuminated. If you notice the sun setting, turn your lights on. This helps your visibility to others any time of day or night.
Night currency – From one hour after sunset to one hour before sunrise, if you wish to carry passengers, you must have accomplished three takeoffs and landings to a full stop within the previous 90 days. Don’t get bogged down staring at your watch and doing the mental math– if it’s dark, you should be night current in the interest of safety.
Are there other procedures and regulations that consistently give you fits? You’re probably not alone. Please share, and we’ll clarify those in a future post. Email us at [email protected].
https://media.flighttrainingcentral.com/wp-content/uploads/2018/09/05163745/inoperative-instrument-1.jpg12001200studentpltnewshttps://media.flighttrainingcentral.com/wp-content/uploads/2025/09/17092615/FTC_Redesign_2025_WhiteRed_WEB.pngstudentpltnews2018-09-10 10:00:022021-06-08 19:23:26The most commonly misunderstood regulations and procedures
The place: New Smyrna Beach Municipal Airport (KEVB), New Smyrna Beach, FL
The aircraft: Cessna 172
The memory: This is from my final approach on my first solo flight – my last landing to complete the milestone. Thanks to my instructor Eric Milkowski and all the guys at Daytona Aviation. After the landing the feeling was incredible knowing that I had accomplished something few people have done.
Want to share your “Friday Photo” of your solo or checkride moment? Send your photo and description (using the format above) to: [email protected]
https://media.flighttrainingcentral.com/wp-content/uploads/2018/09/05173709/Carlos-Bultron.jpg14221242studentpltnewshttps://media.flighttrainingcentral.com/wp-content/uploads/2025/09/17092615/FTC_Redesign_2025_WhiteRed_WEB.pngstudentpltnews2018-09-07 10:00:352021-06-08 19:23:26Friday photo: Carlos Bultron first solo
Learning to fly an airplane is intimidating for new pilots, but learning to hover a helicopter can seem like a truly impossible task. As this video shows, though, that’s not the case at all. Once you understand the aerodynamics, it’s just a matter of keeping everything balanced. Ride along on this first lesson to see what it’s like to fly an Enstrom helicopter.
https://media.flighttrainingcentral.com/wp-content/uploads/2018/08/05173726/Helicopter-hover.jpg450800studentpltnewshttps://media.flighttrainingcentral.com/wp-content/uploads/2025/09/17092615/FTC_Redesign_2025_WhiteRed_WEB.pngstudentpltnews2018-08-31 09:19:222021-06-08 19:23:26Video: learning to hover a helicopter
In this series, we ask the pilots at Sporty’s what gear they carry when they go flying. While every pilot’s flight bag is unique, some common principles apply to everyone: carry enough to be prepared but not too much so that you’re weighed down with unnecessary junk. In this episode you’ll see what JC Mayerle, a product designer at Sporty’s, has in his flight bag.
https://media.flighttrainingcentral.com/wp-content/uploads/2018/08/05173717/whats-in-my-flight-bag-jc.jpg506900studentpltnewshttps://media.flighttrainingcentral.com/wp-content/uploads/2025/09/17092615/FTC_Redesign_2025_WhiteRed_WEB.pngstudentpltnews2018-08-28 09:18:492021-06-08 19:23:26What’s in your flight bag?
There are a number of fuel related myths and misrepresentations floating around the general aviation industry. While I can’t touch them all, I hope to provide some enlightenment around a couple of them in this post. Starting with one about aircraft fuel gauges.
Fuel Gauges
At some point in your past, have you ever heard a pilot or a mechanic make a statement about the accuracy of the fuel gauges? It usually goes something like this, “The only time that the regulations require the fuel gauges to be accurate is when they are empty.”
This statement is a misrepresentation of what the regulation actually said. I am putting this in the past tense because the regulation under 14 CFR Part 23 has been rewritten in the last year or so.
At first glance, the “empty” statement appeared to be true but you needed to read the whole regulation to put it into context.
(b) Fuel quantity indicator. There must be a means to indicate to the flightcrew members the quantity of usable fuel in each tank during flight. An indicator calibrated in appropriate units and clearly marked to indicate those units must be used. In addition–
(1) Each fuel quantity indicator must be calibrated to read “zero” during level flight when the quantity of fuel remaining in the tank is equal to the unusable fuel supply determined under [Sec. 23.959(a);]
(2) Each exposed sight gauge used as a fuel quantity indicator must be protected against damage;
(3) Each sight gauge that forms a trap in which water can collect and freeze must have means to allow drainage on the ground;
(4) There must be a means to indicate the amount of usable fuel in each tank when the airplane is on the ground (such as by a stick gauge);
(5) Tanks with interconnected outlets and airspaces may be considered as one tank and need not have separate indicators; and
(6) No fuel quantity indicator is required for an auxiliary tank that is used only to transfer fuel to other tanks if the relative size of the tank, the rate of fuel transfer, and operating instructions are adequate to–
(i) Guard against overflow; and
(ii) Give the flight crewmembers prompt warning if transfer is not proceeding as planned.
…
The often misunderstood portion of the regulation is §23.1337(b)(1) “Each fuel quantity indicator must be calibrated to read “zero” during level flight when the quantity of fuel remaining in the tank is equal to the unusable fuel supply determined under [Sec. 23.959(a);]” At first glance, it could be read as “it only needs to accurate when it is at zero” but this is not the case. What this portion is trying to clarify is that it needs to read “zero” when the usable fuel is gone even though there may still be “unusable” fuel in the system. It is not saying that is the only time it needs to be accurate.
If we go back to the stem of §23.1337(b), it says, “(b) Fuel quantity indicator. There must be a means to indicate to the flightcrew members the quantity of usable fuel in each tank during flight. An indicator calibrated in appropriate units and clearly marked to indicate those units must be used. In addition—” This seems pretty clear if you don’t skip over it. The indicating system needs to provide an accurate indication to the pilots during flight of how much usable fuel is left in the tanks at all times. There is no specification as to how accurate but it needs to provide an accurate indication.
If we look at the more familiar “§91.205 Powered civil aircraft with standard category U.S. airworthiness certificates: Instrument and equipment requirements,” we’ll see a requirement there as well. When we learn to fly, parts of this regulation are often set to memory. Most student pilots that are approaching their private checkride can tell you that fuel gauges are required for VFR operations. What the regulation actually says is that a “Fuel gauge indicating the quantity of fuel in each tank.” is required. The fact that the gauge is there and showing something is not enough. It must indicate the quantity of fuel in its associated tank.
The new 14 CFR Part 23 regulation related to the fuel system and its gauges is §23.2430 Fuel systems. The “zero” statement is no longer a part of the text. The simplified regulation now states:
(a) Each fuel system must—
…
(4) Provide the flightcrew with a means to determine the total useable fuel available and provide uninterrupted supply of that fuel when the system is correctly operated, accounting for likely fuel fluctuations;
…
As the new version of the regulation indicates, the design must tell the pilots the useable fuel available.
All that said, the fuel gauges on light aircraft are notorious for having problems. Some seem to develop a kind of dead spot when refueled to the same level every time (such as full). Rocking the wings may fix that problem on the ground and a bit of bouncing in the air seems to keep it working while in flight. There are newer sensor designs which purport to alleviate this issue.
You should also not rely solely on the gauge indication to determine how much fuel you have left. If you start with a known quantity of fuel, you should calculate your expected fuel burn prior to your flight and keep track of the time while flying. If either the fuel gauges or your calculations indicate that you are starting to run low on fuel, land at the nearest suitable airport and take on additional fuel.
Fuel in the Tanks
Many a flight instructor has told his or her students a partial truism that the only time you can have too much fuel is when your aircraft is on fire. In a training aircraft with two people on board, this may have some validity. But when you start filling all the seats in an airplane or start flying higher performance aircraft, this may not be the case. Your weight and balance calculations may not allow you to take full fuel on every flight. Depending on the manufacturer, there may also be zero safety tolerance when flying the airplane over its maximum gross weight if you decide to keep adding fuel. For more about topping off the tanks, check out Bret Koebbe’s post, Top off the airplane fuel tanks? Maybe…. For more about weight and balance check out my post, Back to Basics – Weight and Balance.
Flying Safely Is No Accident
We often hear about how safe flying is when compared to driving, and in the carefully calculated and safety managed environment of the airline world, this is true.
In general aviation, safety requires a deliberate approach to risk management that includes determining the fuel required and the fuel available for every flight. It is only through appropriate training and by mitigating as many of the risks as possible that we can have a long and safe experience as a general aviation pilot.
How to use Sporty’s E6B Flight Computer
/in Pilot Gear/by studentpltnewsLearning to fly means learning to make a lot of calculations: wind correction angle, groundspeed, crosswind component, and so much more. The old school way to do that is with a manual E6B, often called the “whiz wheel.” Newer electronic models are much easier to use, and are still allowed on FAA tests. In this video, learn how to perform some of the most common calculations on Sporty’s popular Electronic E6B Flight Computer.
https://www.youtube.com/watch?v=a9jlI4ZCUEU
More information about Sporty’s Electronic E6B Flight Computer.
The most commonly misunderstood regulations and procedures
/in Regulations, Tips and technique/by studentpltnewsI had the pleasure of hosting a popular online panel discussion earlier this year featuring designated pilot examiners (DPEs) and Chief Instructors from around the country offering advice and insight on how to effectively prepare for, and pass, the checkride. If you haven’t had the opportunity to view it, the recording is available free (see below) and would be well worth your time, especially if you have an upcoming exam. Test anxiety is the norm rather than the exception, and the advice from this experienced panel will do wonders at calming the nerves. It also will help you identify common weaknesses of pilot applicants.
During some of the offline preparation and discussion, as the group haggled over busy schedules, the topic of commonly misunderstood procedures and regulations sparked strong opinions among the group. The topics mentioned could be classified into three categories: non-towered airport operations, equipment lists, and night operations.
Non-towered Airport Operations
Perhaps due to the volume of training taking place at towered airports, or due to non-standard practices at non-towered airports, DPEs tend to agree that non-towered airport operations are a source of confusion, and for the most part, lack standardization. The Aeronautical Information Manual (AIM) provides very specific guidance on traffic pattern operations as well as recommended communication procedures. Additionally, Advisory Circular 90-66, Non-Towered Airport Flight Operations, was updated just this year to provide even greater clarity.
Pattern Entry – Enter the pattern in level flight, at a 45-degree angle abeam the midpoint of the runway, at pattern altitude (1,000’ AGL is standard). Maintain pattern altitude until abeam the approach end of the landing runway on downwind leg. If you happen to be approaching the airport on the opposite side of the downwind leg, an accepted alternate entry method is to enter crosswind over midfield and turn downwind directly.
If the pattern is congested when approaching from the opposite side of the field, and it is not advisable to enter directly, it is then recommended to overfly midfield AT LEAST 500’ above pattern altitude and, when clear of the downwind leg, to make a descending turn to join the downwind leg using a standard 45-degree entry. This method requires extreme vigilance to avoid other traffic that also could be approaching for a standard pattern entry.
When approaching the airport from the opposite side of downwind, consider entering crosswind directly over midfield.
Pattern Departure – Continue to track the runway centerline and depart the pattern straight out, or exit with a 45-degree turn, based on ground track, in the direction of the pattern. In other words, the 45-degree turn should be made to the left if the runway has a left-hand pattern and, conversely, to the right if a right-hand pattern is in use. It is recommended to climb at least 500’ above the traffic pattern before completing departure procedure and initiating a turn on course.
Communication – When departing an airport, make an advisory call prior to taxi (include where you are and where you are going) and again before taking the runway for departure (include direction of flight). When inbound to a non-towered airport, make an advisory call 10 miles from the airport with your position and intentions and do so again when entering the downwind, base and final legs. Another call should be made once you have vacated the runway so departing traffic is aware that the runway is clear. Keep it simple, brief and informative as in, “Clermont County Traffic, Skyhawk Three Uniform Charlie, left downwind, Runway 22, Clermont County.”
Adhering to these standard practices is vitally important to avoiding collisions and ensuring pilots have consistent expectations throughout our airspace. While common sense should prevail and slight modifications may be necessary, especially in a particularly congested traffic pattern, pilots should routinely practice these standard procedures.
Equipment Lists
Inoperative equipment ultimately requires the PIC’s determination whether the flight may be conducted.
Pilots are notorious for confusing themselves when it comes to required functioning equipment aboard the airplane. The first rule is that all equipment should be functioning; if it is not, it’s right to be cautious and skeptical as to your ability to conduct your flight safely. If you do make an initial determination that a flight may be conducted safely with non-functioning equipment, refer to FAR 91.213, Inoperative instruments and equipment, as your governing source.
FAR 91.213 first references a Minimum Equipment List (MEL) for potential relief from instruments or equipment not in working order. Most likely, small, training aircraft do not have a MEL. It is in flying large, turbine aircraft or aircraft used in airline operations that one would encounter a MEL. MELs must be physically aboard the aircraft and must be individually approved by the FAA. A MEL includes a detailed listing of instruments, equipment and procedures that allow an aircraft to be operated under specific conditions with inoperative equipment and is often developed by the aircraft manufacturer.
Instead, most flight training aircraft are governed by 91.213 (d), which allows for small, piston-powered aircraft (such as Skyhawks, Cherokees and Cirrus) to be operated with certain inoperative equipment as long as that equipment is not required as part of the aircraft’s certification (airworthiness certificate), not required by the manufacturer in the Kinds of Operation Equipment List, and/or not required by some other regulation or directive.
Should you encounter a piece of equipment that is inoperative and wish to investigate further as to whether the aircraft may still be operated, consult the Equipment List provided in Section 6 (Weight and Balance) of the Pilot Information Manual. If the equipment is required by the manufacturer, your investigation is finished–you can’t fly. If the equipment is not required, you should inquire as to whether some other regulation may apply and ultimately, whether you, the PIC, determine the flight can be conducted safely.
During discussions of necessary equipment or inoperative equipment, pilots commonly get confused by what is provided in FAR 91.205, which is an inventory of the bare essential items required for Day/Night VFR and IFR flight. It is good practice to be familiar with the equipment listed in 91.205, but it also is safe to assume that a manufacturer is NOT going to list a piece of equipment as optional if it is included here. In other words, the manufacturer’s list and your own common sense should prevent you from attempting any operation in violation of the bare minimum equipment provided in FAR 91.205.
Night definitions
If it’s dark, turn your lights on and stay night current.
When it comes to logging night experience, illuminating navigation lights when required, or obtaining currency for night operations with passengers, many pilots confuse the various definitions.
Logging night time – Night time is the end of evening twilight to beginning of morning twilight. If there is a hint of daylight in the air, you have not reached the time period when you would log night time.
Lights on – From sunset to sunrise, your position lights need to be illuminated. If you notice the sun setting, turn your lights on. This helps your visibility to others any time of day or night.
Night currency – From one hour after sunset to one hour before sunrise, if you wish to carry passengers, you must have accomplished three takeoffs and landings to a full stop within the previous 90 days. Don’t get bogged down staring at your watch and doing the mental math– if it’s dark, you should be night current in the interest of safety.
Are there other procedures and regulations that consistently give you fits? You’re probably not alone. Please share, and we’ll clarify those in a future post. Email us at [email protected].
Friday photo: Carlos Bultron first solo
/in Friday Photo/by studentpltnewsThe moment: first solo
The pilot: Carlos Bultron
The place: New Smyrna Beach Municipal Airport (KEVB), New Smyrna Beach, FL
The aircraft: Cessna 172
The memory: This is from my final approach on my first solo flight – my last landing to complete the milestone. Thanks to my instructor Eric Milkowski and all the guys at Daytona Aviation. After the landing the feeling was incredible knowing that I had accomplished something few people have done.
Want to share your “Friday Photo” of your solo or checkride moment? Send your photo and description (using the format above) to: [email protected]
Video: learning to hover a helicopter
/in Fun Flying Videos/by studentpltnewsLearning to fly an airplane is intimidating for new pilots, but learning to hover a helicopter can seem like a truly impossible task. As this video shows, though, that’s not the case at all. Once you understand the aerodynamics, it’s just a matter of keeping everything balanced. Ride along on this first lesson to see what it’s like to fly an Enstrom helicopter.
Video courtesy of FlightChops.
What’s in your flight bag?
/in Pilot Gear/by studentpltnewsIn this series, we ask the pilots at Sporty’s what gear they carry when they go flying. While every pilot’s flight bag is unique, some common principles apply to everyone: carry enough to be prepared but not too much so that you’re weighed down with unnecessary junk. In this episode you’ll see what JC Mayerle, a product designer at Sporty’s, has in his flight bag.
Common Aircraft Fuel Myths
/in Regulations, Tips and technique/by studentpltnewsThere are a number of fuel related myths and misrepresentations floating around the general aviation industry. While I can’t touch them all, I hope to provide some enlightenment around a couple of them in this post. Starting with one about aircraft fuel gauges.
Fuel Gauges
At some point in your past, have you ever heard a pilot or a mechanic make a statement about the accuracy of the fuel gauges? It usually goes something like this, “The only time that the regulations require the fuel gauges to be accurate is when they are empty.”
This statement is a misrepresentation of what the regulation actually said. I am putting this in the past tense because the regulation under 14 CFR Part 23 has been rewritten in the last year or so.
At first glance, the “empty” statement appeared to be true but you needed to read the whole regulation to put it into context.
The regulation in question was §23.1337 titled, “Powerplant instruments installation.” The relevant text starts at §23.1337(b):
…
(b) Fuel quantity indicator. There must be a means to indicate to the flightcrew members the quantity of usable fuel in each tank during flight. An indicator calibrated in appropriate units and clearly marked to indicate those units must be used. In addition–
(1) Each fuel quantity indicator must be calibrated to read “zero” during level flight when the quantity of fuel remaining in the tank is equal to the unusable fuel supply determined under [Sec. 23.959(a);]
(2) Each exposed sight gauge used as a fuel quantity indicator must be protected against damage;
(3) Each sight gauge that forms a trap in which water can collect and freeze must have means to allow drainage on the ground;
(4) There must be a means to indicate the amount of usable fuel in each tank when the airplane is on the ground (such as by a stick gauge);
(5) Tanks with interconnected outlets and airspaces may be considered as one tank and need not have separate indicators; and
(6) No fuel quantity indicator is required for an auxiliary tank that is used only to transfer fuel to other tanks if the relative size of the tank, the rate of fuel transfer, and operating instructions are adequate to–
(i) Guard against overflow; and
(ii) Give the flight crewmembers prompt warning if transfer is not proceeding as planned.
…
The often misunderstood portion of the regulation is §23.1337(b)(1) “Each fuel quantity indicator must be calibrated to read “zero” during level flight when the quantity of fuel remaining in the tank is equal to the unusable fuel supply determined under [Sec. 23.959(a);]” At first glance, it could be read as “it only needs to accurate when it is at zero” but this is not the case. What this portion is trying to clarify is that it needs to read “zero” when the usable fuel is gone even though there may still be “unusable” fuel in the system. It is not saying that is the only time it needs to be accurate.
If we go back to the stem of §23.1337(b), it says, “(b) Fuel quantity indicator. There must be a means to indicate to the flightcrew members the quantity of usable fuel in each tank during flight. An indicator calibrated in appropriate units and clearly marked to indicate those units must be used. In addition—” This seems pretty clear if you don’t skip over it. The indicating system needs to provide an accurate indication to the pilots during flight of how much usable fuel is left in the tanks at all times. There is no specification as to how accurate but it needs to provide an accurate indication.
If we look at the more familiar “§91.205 Powered civil aircraft with standard category U.S. airworthiness certificates: Instrument and equipment requirements,” we’ll see a requirement there as well. When we learn to fly, parts of this regulation are often set to memory. Most student pilots that are approaching their private checkride can tell you that fuel gauges are required for VFR operations. What the regulation actually says is that a “Fuel gauge indicating the quantity of fuel in each tank.” is required. The fact that the gauge is there and showing something is not enough. It must indicate the quantity of fuel in its associated tank.
The new 14 CFR Part 23 regulation related to the fuel system and its gauges is §23.2430 Fuel systems. The “zero” statement is no longer a part of the text. The simplified regulation now states:
(a) Each fuel system must—
…
(4) Provide the flightcrew with a means to determine the total useable fuel available and provide uninterrupted supply of that fuel when the system is correctly operated, accounting for likely fuel fluctuations;
…
As the new version of the regulation indicates, the design must tell the pilots the useable fuel available.
All that said, the fuel gauges on light aircraft are notorious for having problems. Some seem to develop a kind of dead spot when refueled to the same level every time (such as full). Rocking the wings may fix that problem on the ground and a bit of bouncing in the air seems to keep it working while in flight. There are newer sensor designs which purport to alleviate this issue.
Fuel in the Tanks
Many a flight instructor has told his or her students a partial truism that the only time you can have too much fuel is when your aircraft is on fire. In a training aircraft with two people on board, this may have some validity. But when you start filling all the seats in an airplane or start flying higher performance aircraft, this may not be the case. Your weight and balance calculations may not allow you to take full fuel on every flight. Depending on the manufacturer, there may also be zero safety tolerance when flying the airplane over its maximum gross weight if you decide to keep adding fuel. For more about topping off the tanks, check out Bret Koebbe’s post, Top off the airplane fuel tanks? Maybe…. For more about weight and balance check out my post, Back to Basics – Weight and Balance.
Flying Safely Is No Accident
We often hear about how safe flying is when compared to driving, and in the carefully calculated and safety managed environment of the airline world, this is true.
In general aviation, safety requires a deliberate approach to risk management that includes determining the fuel required and the fuel available for every flight. It is only through appropriate training and by mitigating as many of the risks as possible that we can have a long and safe experience as a general aviation pilot.
Stay safe out there!