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altitudes below 30,000 feet. Loss of thrust at higher altitudes may require
driftdown to a lower altitude to improve windmill capability.
The inflight start envelope is provided to identify the region where windmill
starts were demonstrated during certification. It should be noted that this
envelope does not define the only areas where a windmill start may be
successful.
The APU start should be initiated as soon as practical so as to be available for a
starter assisted start attempt if the rapid relight does not succeed.
If the Immediate Action Items are not accomplished either during high engine
RPM and/or in the windmill regime, the engine(s) must be started from the APU
bleed source if both engines are inoperative or the Crossbleed Start procedure
on the ENGINE START- INFLIGHT checklist if only one engine successfully
started.
During descent, this condition may first be indicated by illumination of the
>>@ BUS OFF;BCD SOURCE OFF or LOW OIL PRESSURE lights. If
>>@ BUS OFF; BCD SOURCE OFF lights illuminate, check N2 and
EGT to verify engine operation.
Several attempts should be made while the engines are spooling down before
continuing with the non-memory items of the procedure. However, the number
of windmill start attempts could vary depending on altitude and other conditions.
If the engines have flamed out due to severe weather, volcanic ash, etc., it may
be appropriate to attempt additional windmill starts after exiting these
conditions. Based on circumstances, the Captain must make the decision when
to continue with the non-memory items of the procedure.
If the rapid relight is not successful and the windmilling RPM has stabilized and
a bleed air source (APU) is available, follow this checklist for one start attempt
for each engine then use the ENGINE START - INFLIGHT checklist. With no
bleed air available, increasing airspeed and decreasing altitude, if possible, will
enhance the windmill starting capability of the engines.
(Continued)
737
Flight Manual
Continental
ENGINES, APU
Sec. 2.7 Page 49
Rev. 11/15/02 #41
IMMEDIATE ACTION
Start Switches ....................................................................................FLIGHT
Start Levers.......................................................................................CUTOFF
Start Levers (After EGT Decreases).................................................... IDLE
The immediate action items should be accomplished expeditiously to hopefully
effect an immediate restart before the engines have spooled down completely.
This emergency is most likely the result of flight into areas of heavy/extreme
precipitation. In such conditions, it may take up to 3 minutes to accelerate to
idle thrust. Successful start(s) may not be possible until after leaving the
precipitation. Repeated attempts at restarting the engine(s) may be necessary
once clear of heavy rain, sleet, or hail.
The start levers should remain in cutoff only long enough to indicate a decrease
in EGT.
IF EGT Reaches >>@ 930 Degrees; BCD 950 Degrees:
Repeat above steps.
APU (If Available)............................................................START & ON BUS
Note: Do not wait for successful engine start prior to starting the APU.
The APU generator powers the respective generator Bus and both transfer
Busses. This provides electrical power to both igniters on each engine
which improves start capability.
BCD The APU has demonstrated the capability to provide electrical
and pneumatic power to 20,000 feet.
(Continued)
ENGINES, APU
Sec. 2.7 Page 50
Rev. 11/15/02 #41
Continental
737
Flight Manual
IF One Or Both Engines Start:
¶ When engine parameters have stabilized (either or both engines):
APU Bleed Air Switch..........................................................OFF
Start Switch............................................................................FLT
Thrust Lever .............................................................ADVANCE
Generator Switch....................................................................ON
Pack Switch ........................................................................AUTO
IF Only One Engine Has Restarted:
Accomplish the ENGINE START - INFLIGHT checklist.
IF Neither IRS Attitude Display Recovers After A Generator
Bus Is Restored:
IRS Mode Selector Switches........................................ATT
Magnetic Heading................................................... ENTER
* * * *
IF Neither Engine Has Restarted:
Start Levers ..........................................................................CUTOFF
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737 FLIGHT MANUAL 737飞行手册1(59)
