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How do you start a APU on a 737?
Assuming that the aircraft is parked and not connected to a GPU, Turn Aircraft main battery to the on position. Give it at least 30 seconds to make sure the APU inlet door opens. Then turn the APU master switch to START hold it for 2 seconds and release it. The switch should go and stay by it self in the ON position.
Where is the APU located on a 737?
tail
For Boeing B737 and B747 aircraft, the APU is located inside a compartment in the tail section of the aircraft and is completely enclosed by a sound-reduction fire-proof titanium shroud.
Which of the following will make the APU auto shutdown?
The APU will auto-shutdown for the following reasons: Fire. Low oil pressure. High oil temperature / Fault.
What are the procedures on how do you start the APU of Airbus and Boeing?
To start the APU, first press the master switch button, then the start button. The start sequence begins when the APU inlet flap is fully open. To shut down the APU, turn off the master switch. If the APU bleed has been used, the shutdown sequence incorporates a delay of between 60 and 120 seconds before shutting down.
How does an APU work?
The APU is a turbine engine that sits in the tail of the aircraft. Like any jet engine, it takes in air, compresses it, adds a fuel mixture and ignites it. Once started, the APU powers both an electrical generator and an air compressor, Plumb explained. The generator powers cabin lights and flight-deck avionics.
How does a APU work?
What is a 737 800 plane?
The Boeing 737-800 is a stretched version of the 737-700. It replaced the 737-400. The Boeing 737-800 competes primarily with the Airbus A320. The 737-800 seats 162 passengers in a two-class layout or 189 passengers in a one-class layout. The 737−800 was launched on September 5, 1994.
What is the start procedure for an APU?
What does it mean when the Apu does not start?
If the APU appears to have started but no APU GEN OFF BUS light is observed then you may have a hung start. The current limit is 125A -air and 150A -ground, due to better airflow cooling on the ground. The galley power will automatically be load shed if the APU load reaches 165A.
How long can I operate the APU when the qty/MAINT is illuminated?
LOW OIL QTY/MAINT – When illuminated, you may continue to operate the APU for up to 30 hrs. Note: this light is only armed when APU switch is ON.
Why does my Apu only power one bus in the air?
Because of these limits, the APU may only power one bus in the air. However, if you should accidentally take-off with the APU on the busses then it will continue to power both busses. If the APU EGT reaches 620-650 ° C, the bleed air valve will modulate toward closed.
What is the function of the APU in an aircraft?
The APU is a source of bleed air and AC electrics for the aircraft, this gives independence during turnarounds, electrical backup in the event of engine failure and provides air conditioning & pressurisation during an engine bleeds off take-off.
https://www.youtube.com/watch?v=bgopb1s9CkA