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.21.29
• failure of the ENGINE START switch to stay in GRD until the
starter cutout RPM can cause a hot start. Do not re–engage the
ENGINE START switch until engine RPM is below 20% N2.
• If a fluid leak (other than a continuous stream) from any of the
engine drains is discovered during the Exterior Inspection, the
engine can be started. If during engine start, the ground crew
reports a fluid leak from an engine drain, the engine start may be
continued. In either case, run the engine at idle thrust for up to 5
minutes. If the fluid leak stops during this time, no maintenance
action is needed. If the fluid leak continues after 5 minutes, shut
down the engine for maintenance action.
• For the first flight of the day, at airport elevations at or above 2,000
feet MSL, if the temperature is below 5°C/41°F, consider placing
the Ignition select switch to BOTH before starting the engines.
This may increase the likelihood of a successful engine start on the
first attempt.
Do the ABORTED ENGINE START checklist for one or more of the
following abort start conditions:
• the N1 or N2 does not increase or increases very slowly after the
EGT increases
• there is no oil pressure indication by the time that the engine is
stable at idle
• the EGT does not increase by 10 seconds after the engine start lever
is moved to IDLE detent
• the EGT quickly nears or exceeds the start limit
Select the secondary engine indications. F/O
Air conditioning PACK switches...................................OFF F/O
Start sequence .......................................................Announce C
Call “START ___ ENGINE” C
ENGINE START switch ...............................................GRD F/O
Verify that the N2 RPM increases. C, F/O
When N1 rotation is seen and N2 is at 25%, or (if 25% N2 is not
possible), at maximum motoring and a minimum of 20% N2:
Note: Maximum motoring occurs when N2 acceleration is less
than 1% in approximately 5 seconds.
Engine start lever ....................................IDLE detent C
Monitor fuel flow and EGT indications. C, F/O
September 15, 2016
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