7.24
7.24
Condition: Static discharge around the windshield, bright glow in
the engine inlets, smoke or dust on the flight deck or
an acrid odor indicates the airplane is in volcanic ash.
Exit volcanic ash as quickly as possible. Consider a 180
degree turn.
OXYGEN MASKS AND SMOKE GOGGLES
(if required) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .ON
CREW COMMUNICATIONS
(if required) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ESTABLISH
AUTOTHROTTLE (if engaged) . . . . . . . . . . . . . . .DISENGAGE
[Allows thrust lever to remain where manually positioned.]
THRUST LEVERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CLOSE
Conditions permitting, operate at idle thrust.
[Reduces possible engine damage and/or flameout by decreasing EGT.]
ENGINE START SWITCHES. . . . . . . . . . . . . . . . . . . . . . . . . FLT
PACK SWITCHES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HIGH
WING ANTI–ICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .ON
[Increases bleed air extraction to improve engine stall margin.]
ENGINE ANTI–ICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .ON
[Increases bleed air extraction to improve engine stall margin.]
APU (if available) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .START
[Provides backup electrical and pneumatic source, if required.]
Note: Encountering volcanic ash can lead to abnormal
systems reactions such as:
• Engine malfunctions, increasing EGT, engine stall
or flameout.
• Decrease or loss of airspeed indications.
• Equipment cooling OFF light.
Continued on next page
VOLCANIC ASH
June 3, 2005
737 Flight Crew Operations Manual
Copyright © The Boeing Company. See title page for details.
7.25
7.25
Continued from previous page
If engines have flamed out or stalled, or EGT rapidly
approaches or exceeds limit:
Accomplish the LOSS OF THRUST ON BOTH ENGINES
checklist.
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.
Plan to land at the nearest suitable airport.
June 3, 2005
737 Flight Crew Operations Manual
Copyright © The Boeing Company. See title page for details.
7.26
7.26
Intentionally
Blank
June 3, 2005
737 Flight Crew Operations Manual
Non-Normal Checklists Chapter NNC
Fire Protection Section 8
Copyright © The Boeing Company. See title page for details.
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