737 Flight Crew Operations Manual
7.39
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D6-27370-4Q8-SJA
7.39
9 APU switch
(if APU available) . . . . . . . . . . . . . . . . . . START
This step supplies backup electrical and
pneumatic sources, if needed.
10 If failed, the engine(s) can accelerate to idle very
slowly, especially at high altitudes. If N2 is steadily
increasing and EGT stays within limits, do not
interrupt the start.
11 Plan to land at the nearest suitable airport.
12 Choose one:
▼Volcanic Ash continued▼
Note: Volcanic ash can cause non-normal system
reactions such as:
•Engine malfunctions, increasing EGT,
engine stall or flameout
•Decrease in indicated airspeed or loss of
airspeed indications
•Equipment cooling OFF light.
Engines run normally:
■ ■ ■ ■
Engines do not run normally:
►►Go to the Loss Of Thrust On Both
Engines checklist on page 7.6
■ ■ ■ ■
December 15, 2019
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