7.16
7.16
Condition: An engine tailpipe fire is reported on the ground with
no engine fire warning.
Engine start lever (Affected engine). . . . . . . . . . . . . . CUTOFF
Advise the cabin.
If bleed air is available:
PACK switches (Both). . . . . . . . . . . . . . . . . . . . . . . . . . .OFF
[Allows maximum bleed air for engine motoring.]
ISOLATION VALVE switch . . . . . . . . . . . . . . . . . . . . . AUTO
Engine BLEED AIR switches (Both) . . . . . . . . . . . . . . . .ON
If APU is on:
APU BLEED air switch . . . . . . . . . . . . . . . . . . . . . . . . .ON
If the affected engine start switch is not in GRD:
Allow the affected N2 to decrease below 20%.
ENGINE START switch
(Affected engine) . . . . . . . . . . . . . . . . . . . . . . . . . . . GRD
Continue to motor engine until tailpipe fire is
reported extinguished.
Advise the tower.
If the engine is being motored:
Continue to motor until the tailpipe fire is
extinguished.
ENGINE START SWITCH . . . . . . . . . . . . . . . . . . . . . .OFF
ENGINE TAILPIPE FIRE
June 3, 2005
737 Flight Crew Operations Manual
Copyright © The Boeing Company. See title page for details.
 7.17
7.17
Condition: VIB levels are in excess of 4.0 units accompanied by
airframe vibrations.
If not in icing conditions:
AUTOTHROTTLE (if engaged) . . . . . . . . . . . . .DISENGAGE
[Allows thrust lever to remain where manually positioned.]
THRUST LEVER . . . . . . . . . . . . . . . . . . . . . . . . . . . . RETARD
Retard to maintain VIB below 4 units.
Note: If the VIB indication does not decrease when the
thrust lever is retarded, check other engine
indications. If other engine indications are normal,
no further action is required.
If in icing conditions:
During descent or holding accomplish the following on
one engine at a time at approximately 15 minute
intervals:
ENGINE START SWITCH. . . . . . . . . . . . . . . . . . . . . . . . . FLT
THRUST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ADJUST
Adjust thrust to 45% N1. After approximately five
seconds, advance thrust lever slowly to a minimum of
80% N1.
If vibration does not decrease:
Accomplish the procedure for “If not in icing
conditions.”
HIGH ENGINE VIBRATION
June 3, 2005
737 Flight Crew Operations Manual
Copyright © The Boeing Company. See title page for details.

7.18
7.18
Condition: Loss of all thrust on both engines or loss of thrust
lever response from both engines.
If EGT reaches 930°C, repeat the above steps.
Note: In moderate to heavy rain it may take up to 3 minutes
to accelerate to idle.
APU (if available) . . . . . . . . . . . . . . . . . . . . . START & ON BUS
Do not wait for successful engine start(s) prior to starting
APU.
[The APU has demonstrated the capability to provide electrical and
pneumatic power up to 20,000 feet.]
If neither restart is successful and N2 is below 15%:
WING ANTI–ICE SWITCH . . . . . . . . . . . . . . . . . . . . . . . .OFF
PACK SWITCHES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .OFF
APU BLEED AIR SWITCH . . . . . . . . . . . . . . . . . . . . . . . . .ON
IGNITION SELECT SWITCH . . . . . . . . . . . . . . . . . . . . BOTH
EITHER ENGINE START SWITCH . . . . . . . . . . . . . . . . GRD
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
LOSS OF THRUST ON BOTH ENGINES
ENGINE START SWITCHES. . . . . . . . . . . . . . . . . . . . . . . . . FLT
ENGINE START LEVERS . . . . . . . . . . . . . . . . . . . . . . . CUTOFF
EGT decreasing:
ENGINE START LEVERS. . . . . . . . . . . . . . . . .IDLE DETENT
June 3, 2005
737 Flight Crew Operations Manual
Copyright © The Boeing Company. See title page for details.
 7.19
7.19
Continued from previous page
When engine parameters have stabilized:
APU BLEED AIR SWITCH . . . . . . . . . . . . . . . . . . . . . . . .OFF
ENGINE START SWITCH. . . . . . . . . . . . . . . . . . . . . . . . . FLT
THRUST LEVER . . . . . . . . . . . . . . . . . . . . . . . . . . .ADVANCE
ENGINE GENERATOR SWITCH . . . . . . . . . . . . . . . . . . . .ON
　
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