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tower and ensure that the area to the rear is clear. Increase thrust on the
operating engine until there is a minimum of 30 PSI duct pressure and use this
air source to start the remaining engine.
Engine Bleed Air Switches...........................................................................ON
APU Bleed Air Switch................................................................................OFF
Air Conditioning Pack Switches ...............................................................OFF
Isolation Valve Switch.............................................................................OPEN
Ensures pneumatic air supply for engine start.
Throttle (Operating Engine) .........................................................ADVANCE
Duct Pressure ...........................................................................................30 PSI
(Continued)
ENGINES, APU
Sec. 2.7 Page 24
Rev. 11/15/02 #41
Continental
737
Flight Manual
Non-Operating Engine..........................................................................START
Use normal start procedures with crossbleed air. After starter cutout,
reduce thrust.
Isolation Valve Switch............................................................................ AUTO
After Start / Delayed Engine Start Checklist .....................ACCOMPLISH
* * * *
ENGINE START – FIRE DURING START
IF Reported By Ground Personnel And No Fire Warning:
This is an internal fire. Place the start lever to CUTOFF position and
continue to motor the engine with the start switch. If the start switch
has been previously released, re-engage starter at 20% N2 or less to
motor the engine. Engine air will purge fuel quickly and eliminate the
fire.
* * * *
IF Fire During Start With Fire Warning:
Bell and light indicate the fire has progressed to the area between the
cowling and the engine to where the fire detector units are located.
Complete the ENGINE / APU FIRE ON GROUND checklist.
* * * *
OR
737
Flight Manual
Continental
ENGINES, APU
Sec. 2.7 Page 25
Rev. 11/15/02 #41
>>@ ENGINE START - HIGH ALTITUDE
At high-altitude airports with a field elevation above 7000 feet MSL a normal
engine start may not occur.
This would be indicated when after normal starter cutout at 46% N2, if:
· N2 decreases below 40%,
· Or EGT rises rapidly toward 725° C,
· Or engine does not reach idle RPM within 5 minutes.
If this situation occurs, you would:
· Place Start Lever in CUT OFF.
· Motor Engine for 60 seconds. If starter has disengaged, do not re-engage
starter until N2 is below 20%.
· Place Start Switch to OFF.
For the second start attempt:
· Manually hold the start switch to GRD to keep the starter engaged until N2
reaches 50%.
· If possible, use the Cross Bleed Start procedure on the second engine to
ensure maximum start pressure and volume.
The above procedures should only be used for specific cases and should not
become the norm. If an APU is consistently weak for engine start, enter a
maintenance discrepancy.
Note: If normal start procedures do not provide a normal start for the
specified engine, consideration may be given to starting the opposite
engine next, then use the Cross Bleed Start procedure on the initial
engine.
* * * *
ENGINES, APU
Sec. 2.7 Page 26
Rev. 11/15/02 #41
Continental
737
Flight Manual
ENGINE START - IN FLIGHT
Complete the ENGINE FAILURE / FIRE / SHUTDOWN / SEVERE DAMAGE /
SEPARATION checklist before attempting a restart. Evaluate engine
indications for evidence of damage, which would preclude a restart attempt.
Inflight Start Envelope .......................................................................CHECK
To determine if a windmilling start or starter assist is required check:
>>@ Caution: Crossbleed start should be used if N2 is below 15
percent.
Fire Handle (Affected Engine) ..........................................................PUSH IN
Throttle (Affected Engine) ............................................................... CLOSED
Start Lever (Affected Engine).......................................................... CUTOFF
IF Crossbleed Start Required:
Ensure that the aircraft is pressurized with engine bleed air.
Pack Switch (Affected Side) .......................................................OFF
Isolation Valve Switch............................................................. AUTO
CROSSBLEED WINDMILL
>>@ BCD
~ (Continued)
OR
737
Flight Manual
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