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If the APU does not reach the proper speed with the proper acceleration rate within the time limit of the starter, the start cycle automatically terminates. The start cycle may take as long as 135 seconds.
Operate the APU for one full minute before using it as a bleed air source. This one minute stabilization is recommended to extend the service life of the APU.
APU Shutdown
Operate the –129 APU for one full minute with no bleed air load prior to shutdown. This cooling period is recommended to extend the turbine wheel life of the APU.
Copyright . The Boeing Company. See title page for details.
7.30.2  December 7, 2001

Engines, APU -APU System Description
737 Operations Manual
For the –129 APU, moving the APU switch to OFF shuts down the APU, trips the APU generator, and closes the APU bleed air valve. Shutdown can also be accomplished by pulling the APU fire switch.
For the –280 APU, moving the APU switch to OFF trips the APU generator and closes the APU bleed air valve. Shutdown occurs automatically after 90 seconds. Immediate shutdown can be accomplished by pulling the APU fire switch.
For the APS 2000 APU, moving the APU switch to OFF trips the APU generator and closes the APU bleed air valve. Shutdown occurs automatically after 30 seconds or 60 seconds, or with no delay at all, depending on the installation. Immediate shutdown can be accomplished by pulling the APU fire switch.
Fuel Control Unit (FCU)
A Fuel Control Unit (FCU) controls APU engine speed and exhaust gas temperature. Automatic shutdown protection is provided for overspeed conditions, low oil pressure, high oil temperature, APU fire, and fuel control unit failure. Control air input is provided to the fuel control unit through a solenoid operated three-way control valve.
The control air pressure is modulated in response to EGT changes. When electrical load and bleed air extraction combine to raise the EGT above acceptable levels, the bleed air valve will modulate toward the closed position. With the –129 APU, in the event of an overtemperature, the bleed air valve will close rapidly, but the APU will continue to run without initiating an automatic shutdown With the –280 or APS 2000 APU, the APU will shut down and the FAULT light will illuminate.
APU Automatic Galley Load Shedding
On some airplanes, galley electrical loads will automatically be shed should the total airplane electrical power requirements exceed design limits with the APU generator providing electrical power.
Copyright . The Boeing Company. See title page for details.
December 1, 2000  7.30.3
Engines, APU -APU System Description 737 Operations Manual

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Copyright . The Boeing Company. See title page for details.
7.30.4  December 1, 2000

Controls and Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  8.10.1
Overheat/Fire Protection Panel Switches . . . . . . . . . . . . . . . . . . .  8.10.1
Overheat/Fire Protection Panel Lights . . . . . . . . . . . . . . . . . . . . .  8.10.3
Cargo Fire Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  8.10.5
Master Fire Warning Light. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  8.10.6
APU Ground Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  8.10.7
Lavatory Fire  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  8.10.8
Lavatory Fire Extinguisher . . . . . . . . . . . . . . . . . . . . . . . . . . .  8.10.8
System Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  8.20.1
Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  8.20.1 Engine Fire Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  8.20.1 Engine Overheat and Fire Detection . . . . . . . . . . . . . . . . . . . .  8.20.1 Engine Fire Extinguishing . . . . . . . . . . . . . . . . . . . . . . . . . . .  8.20.2 Engine Fire Extinguisher Schematic  . . . . . . . . . . . . . . . . . . .  8.20.3 APU Fire Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  8.20.3 APU Fire Detection  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  8.20.3 APU Fire Extinguishing . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  8.20.4 Main Wheel Well Fire Protection  . . . . . . . . . . . . . . . . . . . . . . . .  8.20.4 Main Wheel Well Fire Detection  . . . . . . . . . . . . . . . . . . . . . .  8.20.5 Cargo Compartment Fire Protection (as installed) . . . . . . . . . . .  8.20.5 Cargo Compartment Smoke Detection . . . . . . . . . . . . . . . . . .  8.20.5 Cargo Compartment Fire Warning  . . . . . . . . . . . . . . . . . . . . .  8.20.5 Cargo Compartment Fire Extinguishing . . . . . . . . . . . . . . . . .  8.20.5 Cargo Fire Extinguisher Schematic . . . . . . . . . . . . . . . . . . . .  8.20.6 Lavatory Fire Protection  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  8.20.6 Lavatory Smoke Detection . . . . . . . . . . . . . . . . . . . . . . . . . . .  8.20.6 Lavatory Fire Extinguisher System . . . . . . . . . . . . . . . . . . . .  8.20.6 Fire and Overheat System Tests . . . . . . . . . . . . . . . . . . . . . . . . . .  8.20.7 FAULT/INOP Test Detection  . . . . . . . . . . . . . . . . . . . . . . . . .  8.20.7
　
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