Left Wing Root, Pack, and Lower Fuselage
Leading edge flaps .........................................................................Check
Probes, sensors, ports, vents, and drains (as applicable)................Check
Exterior lights.................................................................................Check
Pack and pneumatic access doors ................................................. Secure
Ram air deflector door .............................................................. Extended
Preflight Procedure – First Officer
The first officer normally does this procedure. The captain may do this procedure as needed.
Flight control panel ........................................................................Check FLIGHT CONTROL switches – Guards closed Verify that the flight control LOW PRESSURE lights are
illuminated.
Flight SPOILER switches – Guards closed
YAW DAMPER switch – ON
Verify that the YAW DAMPER light is extinguished.
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Normal Procedures -Amplified Procedures 737 Flight Crew Operations Manual
Verify that the standby hydraulic LOW QUANTITY light is
extinguished.
Verify that the standby hydraulic LOW PRESSURE light is
extinguished.
YD651 - YK104 Verify that the STBY RUD ON light is extinguished. ALTERNATE FLAPS master switch – Guard closed ALTERNATE FLAPS position switch – OFF Verify that the FEEL DIFF PRESS light is extinguished. Verify that the SPEED TRIM FAIL light is extinguished. Verify that the MACH TRIM FAIL light is extinguished. Verify that the AUTO SLAT FAIL light is extinguished. NAVIGATION panel ...........................................................................Set VHF NAV transfer switch – NORMAL IRS transfer switch – NORMAL FMC transfer switch – NORMAL DISPLAYS panel .................................................................................Set SOURCE selector – AUTO CONTROL PANEL select switch – NORMAL Fuel panel ............................................................................................Set Verify that the ENG VALVE CLOSED lights are illuminated dim. Verify that the SPAR VALVE CLOSED lights are illuminated dim. Verify that the FILTER BYPASS lights are extinguished. CROSSFEED selector – Closed Verify that the VALVE OPEN light is extinguished.
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Normal Procedures -Amplified Procedures 737 Flight Crew Operations Manual
FUEL PUMP switches – OFF
Verify that the center tank fuel pump LOW PRESSURE lights are extinguished. Verify that the main tank fuel pump LOW PRESSURE lights are
illuminated. Electrical panel .................................................................................... Set BATTERY switch – Guard closed YD651 - YK104 CAB/UTIL power switch – ON YD651 - YK104 IFE/PASS SEAT power switch – ON
YA613 - YC413 GALLEY power switch – ON STANDBY POWER switch – Guard closed
Verify that the STANDBY PWR OFF light is extinguished.
Verify that the BAT DISCHARGE light is extinguished.
Verify that the TR UNIT light is extinguished.
Verify that the ELEC light is extinguished.
Generator drive DISCONNECT switches – Guards closed
Verify that the DRIVE lights are illuminated.
BUS TRANSFER switch – Guard closed Verify that the TRANSFER BUS OFF lights are extinguished. Verify that the SOURCE OFF lights are extinguished. Verify that the GEN OFF BUS lights are illuminated.
Overheat and fire protection panel.................................................Check
Do this check if the flight crew did not do the Electrical Power Up supplementary procedure. This check is needed once per flight day. Verify that the engine No. 1, APU, and engine No. 2 fire switches are
in.
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Normal Procedures -Amplified Procedures 737 Flight Crew Operations Manual
Alert ground personnel before the following test is accomplished: OVERHEAT DETECTOR switches – NORMAL TEST switch – Hold to FAULT/INOP
Verify that the MASTER CAUTION lights are illuminated. Verify that the OVHT/DET annunciator is illuminated. Verify that the FAULT light is illuminated.
If the FAULT light fails to illuminate, the fault monitoring system is inoperative.
Verify that the APU DET INOP light is illuminated. Do not run the APU if the APU DET INOP light does not illuminate.
Note: The fire warning light flashes and the horn sounds on the APU ground control panel when this test is done with the APU running. This can be mistaken by the ground crew as an APU fire.
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