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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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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