and APU DET INOP lights are illuminated.
If the FAULT light fails to illuminate, the fault monitoring system
is inoperative.
Normal Procedures -Amplified Procedures 737 Operations Manual
If APU DET INOP light fails to illuminate, do not operate APU. Fire/Overheat warning ...................................................................Check Note: Alert ground personnel before this test is accomplished with the
APU operating. The fire warning light flashes and the horn sounds on the APU ground control panel.
TEST switch – Hold to OVHT/FIRE Verify fire warning bell sounds, master FIRE WARN lights, MASTER CAUTION lights and OVHT/DET annunciator illuminate.
Master FIRE WARNING light – Push Verify master FIRE WARN lights and fire warning bell cancel. Verify engine No. 1, APU, and engine No. 2 fire warning switch
and engine No. 1 and engine No. 2 OVERHEAT lights are illuminated. If AC busses are powered, verify WHEEL WELL fire warning light is illuminated.
Verify FAULT light and APU DET INOP light remain extinguished. If FAULT light illuminates, a detection loop is inoperative.
EXTINGUISHER TEST switch ....................................................Check Position TEST Switch to 1, verify the green extinguisher test lights are illuminated. Release switch and verify the lights are extinguished. Repeat for test position 2. APU .............................................................................. Start & on busses
When the APU GEN OFF BUS light illuminates:
APU GENERATOR bus switches – ON
BUS OFF lights – Extinguished
Note: It is recommended that the APU be operated for one minute before using as a bleed air source. FLAP lever .......................................................................................... Set Position the FLAP lever to agree with the FLAPS position indicator. CARGO FIRE system (as installed) ..............................................Check
Copyright . The Boeing Company. See title page for details.
NP.20.2 June 4, 2004
Normal Procedures -Amplified Procedures 737 Operations Manual
DETECTOR SELECT switches – NORM TEST switch – Push Verify fire warning bell sounds and master FIRE WARN lights illuminate.
Master FIRE WARN light – Push Verify master FIRE WARN lights and fire warning bell cancel. Verify cargo fire (FWD, AFT) warning lights are illuminated. Verify DETECTOR FAULT light remains extinguished.
Note: If a cargo fire warning light does not illuminate and the DETECTOR FAULT light illuminates, a detection loop is inoperative.
Verify the green EXTINGUISHER test lights are illuminated. Verify the cargo fire bottle DISCHARGE light is illuminated. Emergency equipment ................................................................... Check Fire extinguisher – Check and stow
Verify safetied. Crew oxygen valve .......................................................................... Open Circuit breakers (P–6).................................................................... Check
Verify circuit breakers are in or collared in compliance with dispatch
requirements. Emergency locator transmitter switch (as installed) .........................................................................ARM
Flight Recorder .................................................................................. Test FLIGHT RECORDER OFF light – Illuminated Trip and date encoder (as installed) – Set FLIGHT RECORDER test switch – TEST
FLIGHT RECORDER OFF light – Extinguished
FLIGHT RECORDER test switch – NORMAL
Normal Procedures -Amplified Procedures
737 Operations Manual
MACH AIRSPEED WARNING TEST switches ............................ Push Verify clacker sounds.
STALL WARNING TEST switches ................................................ Push Verify control column vibration when each switch is pushed. Note: With hydraulic power off, the leading edge flaps may droop enough to cause an asymmetry signal, resulting in a failure of the stall warning system test. Should this occur, place the “B” system electric pump ON and retract the flaps. When flaps are retracted, repeat the test.
REVERSER lights .............................................................. Extinguished
