APU FAULT due to “No Flame Shutdown” - The increase in APU exhaust gas temperature (EGT) does not rise more than 100°F (37.8°C) for 23 seconds and the APU speed is more than 7% during an APU start cycle. Aircraft will be dispatched iaw MEL 49-01 APU inop. You can see APU BITE (built-in test equipment) to confirm that the APU Fuel Valve operates normally (there is fuel flow). Another engineer is inspecting the APU during the start. If the APU Fuel Valve isn’t operating, aircraft would need to be
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APU FAULT due to “No Flame Shutdown” - The increase in APU exhaust gas temperature (EGT) does not rise more than 100°F (37.8°C) for 23 seconds and the APU speed is more than 7% during an APU start cycle. Aircraft will be dispatched iaw MEL 49-01 APU inop. You can see APU BITE (built-in test equipment) to confirm that the APU Fuel Valve operates normally (there is fuel flow). Another engineer is inspecting the APU during the start. If the APU Fuel Valve isn’t operating, aircraft would need to be
10.5K viewsAug 9, 2022
FacebookThe 737 Handbook
Check out this video showcasing the Auxiliary Power Unit (APU) starting up on an aircraft. Notice the smoke coming out from the APU exhaust? What’s Happening? I think , It’s primarily due to the combustion process as the APU powers up, especially if the unit hasn't been used recently. Importance of APU ! - Provides electrical power and air conditioning while the aircraft is on the ground. - Supplies bleed air to start the main engines. - Enhances passenger comfort and operational efficiency. APU
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Check out this video showcasing the Auxiliary Power Unit (APU) starting up on an aircraft. Notice the smoke coming out from the APU exhaust? What’s Happening? I think , It’s primarily due to the combustion process as the APU powers up, especially if the unit hasn't been used recently. Importance of APU ! - Provides electrical power and air conditioning while the aircraft is on the ground. - Supplies bleed air to start the main engines. - Enhances passenger comfort and operational efficiency. APU
3.5K viewsFeb 20, 2025
FacebookAeroclub
The Airbus A320’s Auxiliary Power Unit (APU) is vital on the ground — powering electrics and starting engines — but it can’t be started above 25,000 feet. In thin air, the APU’s small turbine simply can’t spool up safely, so Airbus designed it primarily for ground use and low-altitude emergencies. Once running, it can provide backup power in flight, but at cruise, you’re relying on the main engines and redundancy systems. A clever compromise of weight, safety, and design. #avgeek #planespotting
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The Airbus A320’s Auxiliary Power Unit (APU) is vital on the ground — powering electrics and starting engines — but it can’t be started above 25,000 feet. In thin air, the APU’s small turbine simply can’t spool up safely, so Airbus designed it primarily for ground use and low-altitude emergencies. Once running, it can provide backup power in flight, but at cruise, you’re relying on the main engines and redundancy systems. A clever compromise of weight, safety, and design. #avgeek #planespotting
12.5K views7 months ago
FacebookCockpit King
Aircraft Auxiliary Power Unit (APU) Functions and Benefits
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Aircraft Auxiliary Power Unit (APU) Functions and Benefits
16K viewsNov 5, 2024
TikTokaircraft_engineer_
Uncover the APU showdown between Boeing and Airbus 🔧✈️ — two very different philosophies in aviation engineering. The Auxiliary Power Unit (APU) isn’t just a backup engine; it’s a critical lifeline for electrical power and air systems when the main engines aren’t running. Airbus takes redundancy to the skies, with APUs certified to operate even at cruise altitudes above 35,000 feet — giving pilots extra safety options during emergencies. Boeing, on the other hand, leans into weight efficiency a
2:07
Uncover the APU showdown between Boeing and Airbus 🔧✈️ — two very different philosophies in aviation engineering. The Auxiliary Power Unit (APU) isn’t just a backup engine; it’s a critical lifeline for electrical power and air systems when the main engines aren’t running. Airbus takes redundancy to the skies, with APUs certified to operate even at cruise altitudes above 35,000 feet — giving pilots extra safety options during emergencies. Boeing, on the other hand, leans into weight efficiency a
3K views8 months ago
FacebookCockpit King
Auxiliary Power Unit - APU Explained
Auxiliary Power Unit - APU Explained
Apr 21, 2022
wingtalkers.com
Did you know commercial jets usually have a "secret" engine hidden in the tail? 🤫 It is called the Auxiliary Power Unit (APU). This small turbine engine plays a massive role when the aircraft is parked on the ground. Since the main engines are usually turned off at the gate, the APU kicks in to generate electricity for the aircraft's systems. Most importantly, it powers the Air Conditioning (AC) to keep the cabin cool before departure. It is the unsung hero of ground operations! ❄️ 👉 Follow us
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Did you know commercial jets usually have a "secret" engine hidden in the tail? 🤫 It is called the Auxiliary Power Unit (APU). This small turbine engine plays a massive role when the aircraft is parked on the ground. Since the main engines are usually turned off at the gate, the APU kicks in to generate electricity for the aircraft's systems. Most importantly, it powers the Air Conditioning (AC) to keep the cabin cool before departure. It is the unsung hero of ground operations! ❄️ 👉 Follow us
474 views2 months ago
FacebookHong Kong Professional Airline Pilots Associati…
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Multiple crew reports of APU auto shutdowns triggered a focused inspection of the ignition system. Igniter plugs and leads were replaced to eliminate potential high-energy ignition faults and ensure reliable light-off, proper flame detection, and stable combustion during start and operation. On the A320, the APU is a self-contained gas turbine that provides electrical power and pneumatic bleed air on the ground - and as backup in flight if required. It supports engine starts, powers aircraft sys
1.5K views1 month ago
TikTokmuc_maintenance
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Technology on Instagram: "That grinding sound you hear before an A320 takes off is actually the plane’s auxiliary power unit (APU) coming to life. The APU is a small jet engine in the tail that provides electricity and pressurized air for systems like cabin air conditioning, avionics, and engine start—essentially powering the plane while it’s on the ground. The grinding or whirring noise comes from the mechanical components spooling up, and once the main engines start, the APU quiets down. It’s
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