Starting with Ground Air Source (AC electrical power available)
Engine No. 1 must be started first.
When cleared to start: APU BLEED air switch...............................................................OFF Engine No. 1 start ............................................................Accomplish
Use normal start procedures.
WARNING:To minimize the hazard to ground personnel, the external air should be disconnected, and engine No. 2 started using the Engine Crossbleed Start procedure.
Engine Crossbleed Start
Prior to using this procedure, ensure that the area to the rear is clear. Engine BLEED air switches............................................................... ON APU BLEED air switch ....................................................................OFF PACK switches..................................................................................OFF
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Supplementary Procedures -Engines, APU
737 Flight Crew Operations Manual
ISOLATION VALVE switch .........................................................AUTO Ensures bleed air supply for engine start.
Engine thrust lever (operating engine) ................................ Advance thrust lever until bleed duct pressure indicates 30 PSI
Non–operating engine.......................................................................Start Use normal start procedures with crossbleed air.
After starter cutout, adjust thrust on both engines, as required.
Setting N1 Bugs with an Inoperative FMC
Reference the Performance – Inflight section to determine N1 setting for desired phase of flight.
N1 SET outer knob ........................................................................BOTH The last FMC computed value is displayed by reference N1 bugs and readouts. If the FMC has not calculated an input since power up, a default value of 104% is displayed.
N1 SET inner knob ........................................................................Set N1
Note: If the N1 SET outer knob is returned to the AUTO position, the bugs and readouts will revert to the last FMC computed value or 104% if the FMC has not calculated an input since power up.
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Supplementary Procedures -Engines, APU 737 Flight Crew Operations Manual
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SP.7.6 July 28, 2000
737 Flight Crew Operations Manual
Fire and Overheat System Test with an Inoperative Loop
To determine the specific inoperative loop:
OVHT DET switches .......................................................................A
Test switch ......................................................................OVHT/FIRE If the FAULT light remains extinguished and both ENG
OVERHEAT lights and engine fire warning switches illuminate,
loop A is good.
If the FAULT light illuminates and one of the ENG OVERHEAT
lights and corresponding engine fire warning switch remain
extinguished, there is a fault in loop A of the detection system of
that engine.
OVHT DET switches .......................................................................B
Test switch ......................................................................OVHT/FIRE If the FAULT light remains extinguished and both ENG
OVERHEAT lights and engine fire warning switches illuminate,
loop B is good.
If the FAULT light illuminates and one of the ENG OVERHEAT
lights and corresponding engine fire warning switch remain
extinguished, there is a fault in loop B of the detection system of
that engine.
OVHT DET switches .......................................................As required Select the good loop for each engine (NORMAL if both loops tested good).
Test switch ......................................................................OVHT/FIRE If the test is successful leave the fire panel in this configuration for flight.
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