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If after 30 seconds the engine fire warning switch or ENG
OVERHEAT light remains illuminated:
ENGINE FIRE
WARNING SWITCH . . . . . . . . . . . . . . . . . . . . ROTATE TO
REMAINING BOTTLE
Rotate to the opposite stop and hold for one
second.
June 3, 2005
737 Flight Crew Operations Manual
Copyright © The Boeing Company. See title page for details.
 7.7
7.7
Continued from previous page
If high airframe vibration occurs and continues after engine
is shut down:
Without delay, reduce airspeed and descend to a safe
altitude which results in an acceptable vibration level. If
high vibration returns and further airspeed reduction and
descent are not practicable, increasing airspeed may
reduce vibration.
ISOLATION VALVE SWITCH . . . . . . . . . . . . . . . . . . . . . CLOSE
PACK SWITCH (affected side). . . . . . . . . . . . . . . . . . . . . . .OFF
[Causes operating pack to regulate to high flow in flight with flaps up.]
APU BLEED AIR SWITCH . . . . . . . . . . . . . . . . . . . . . . . . . .OFF
APU (if available) . . . . . . . . . . . . . . . . . . . . . START & ON BUS
FUEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .BALANCE
TRANSPONDER MODE SELECTOR
(TCAS equipped airplanes) . . . . . . . . . . . . . . . . . . TA/TA ONLY
[Prevents climb commands which can exceed single engine performance
capability.]
If wing anti–ice is required:
ISOLATION VALVE SWITCH (after fire has been
extinguished) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AUTO
Plan to land at the nearest suitable airport.
Accomplish the ONE ENGINE INOPERATIVE LANDING
checklist when appropriate.
June 3, 2005
737 Flight Crew Operations Manual
Copyright © The Boeing Company. See title page for details.

7.8
7.8
Condition: The FAULT light illuminated indicates both loops on
an engine have failed.
The fire detection system in one or both engines is
inoperative.
Condition: Engine oil temperature is in the yellow band, or at or
above the red radial.
If temperature is at or above the red radial:
Accomplish the ENGINE FAILURE/SHUTDOWN checklist.
If temperature is in the yellow band:
AUTOTHROTTLE (if engaged) . . . . . . . . . . . . .DISENGAGE
[Allows thrust lever to remain where manually positioned.]
THRUST LEVER (affected engine) . . . . . . . . . . . . . RETARD
Retard until engine oil temperature is within normal
operating range or thrust lever is closed.
If temperature is in the yellow band for more than 15
minutes:
Accomplish the ENGINE FAILURE/SHUTDOWN
checklist.
ENGINE FIRE/OVERHEAT
DETECTOR FAULT
ENGINE HIGH OIL TEMPERATURE
June 3, 2005
737 Flight Crew Operations Manual
Copyright © The Boeing Company. See title page for details.
 7.9
7.9
Intentionally
Blank
June 3, 2005
737 Flight Crew Operations Manual
Copyright © The Boeing Company. See title page for details.

7.10
7.10
Condition: Engine start is needed after a shutdown with no fire or
apparent damage.
Complete the ENGINE FAILURE AND SHUTDOWN checklist
before attempting an inflight engine start.
IN-FLIGHT START ENVELOPE . . . . . . . . . . . . . . . . . . . CHECK
CAUTION: Starter assist should be used if N2 is below 15%.
THRUST LEVER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CLOSE
ENGINE START LEVER . . . . . . . . . . . . . . . . . . . . . . . . CUTOFF
If starter assist is needed:
PACK SWITCH (affected side) . . . . . . . . . . . . . . . . . . . .OFF
DUCT PRESSURE . . . . . . . . . . . . . . . . . . . MINIMUM 30 PSI
If needed, advance the thrust lever to increase duct
pressure.
IGNITION SELECT SWITCH . . . . . . . . . . . . . . . . . . . . BOTH
ENGINE START SWITCH . . . . . . . . . . . . . . . . . . . . . . .GRD/FLT
ENGINE START LEVER . . . . . . . . . . . . . . . . . . . .IDLE DETENT
Move engine start lever to IDLE detent at a minimum of
15% N2.
If EGT does not increase in 30 seconds or another abort
start condition as listed in normal procedures occurs:
ENGINE START LEVER . . . . . . . . . . . . . . . . . . . . . . CUTOFF
ENGINE START SWITCH. . . . . . . . . . . . . . . . . . . . . . . . .OFF
Engines may accelerate to idle very slowly, especially at
high altitudes. Slow acceleration may be incorrectly
interpreted as a hung start or an engine malfunction. If N2 is
steadily increasing, and EGT remains within limits, the start
is progressing normally.
Continued on next page
ENGINE IN-FLIGHT START
June 3, 2005
　
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