737 Flight Crew Operations Manual
Normal Procedures -
Amplified Procedures
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
D6-27370-866-EGP NP.21.53
Verify that the parking brake warning light is illuminated.
Electrical power ...............................................................Set F/O
If APU power is needed:
Verify that the APU GENERATOR OFF BUS light is illuminated.
APU GENERATOR bus switches – ON
Verify that the SOURCE OFF lights are extinguished.
If external power is needed:
Verify that the GRD POWER AVAILABLE light is illuminated.
GRD POWER switch – ON
Verify that the SOURCE OFF lights are extinguished.
Engine start levers ................................................CUTOFF C
Operate the engines at or near idle thrust for a minimum of
three minutes before shutdown to thermally stabilize the
engines and reduce undercowl soak-back temperatures.
Taxi thrust can be considered idle thrust for this purpose.
If idle reverse thrust or no reverse thrust is used during the landing
rollout, the three minute period can begin when thrust is reduced to
idle for landing.
Routine cooldown times of less than three minutes before engine
shutdown can cause engine degradation.
If towing is needed:
Establish communications with ground handling personnel C
WARNING: If the nose gear steering lockout pin is not
installed and hydraulic system A is pressurized,
any change to electrical or hydraulic power with
the tow bar connected may cause unwanted tow
bar movement.
Verify that the nose gear steering lockout pin is installed, or,
if the nose gear steering lockout pin is not used C
System A HYDRAULIC PUMP switches – OFF
Verify that the system A pump LOW PRESSURE lights are
illuminated.
CAUTION: Do not hold or turn the nose wheel steering wheel
during pushback or towing. This can damage the
nose gear or the tow bar.
September 15, 2016
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