737 Flight Crew Operations Manual
Air Systems -
Controls and Indicators
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
2.10.10 D6-27370-866-EGP
3 Flight Altitude (FLT ALT) Indicator
• indicates selected cruise altitude
• set before takeoff.
Note: A panel failure detected after a DC power interruption will result in the
display of “88888” or all dashes. If cabin altitude and cabin rate are
normal, automatic control of cabin pressure is not affected by the failure.
Note: FLT ALT indicator failure may result in the display of non-numbers or a
blank display. If the indicator cannot be changed by rotating the flight
altitude selector, it may be necessary to monitor the pressurization system
to ensure normal operation, especially during climb and descent.
4 Flight Altitude Selector
Rotate – set planned cruise altitude (-1,000 ft. to 42,000 ft. in 500 ft. increments).
5 Landing Altitude (LAND ALT) Indicator
• indicates altitude of intended landing field
• set before takeoff.
Note: A panel failure detected after a DC power interruption will result in the
display of “88888” or all dashes. If cabin altitude and cabin rate are
normal, automatic control of cabin pressure is not affected by the failure.
Note: LAND ALT indicator failure may result in the display of non-numbers or
a blank display. If the indicator cannot be changed by rotating the flight
altitude selector, it may be necessary to monitor the pressurization system
to ensure normal operation, especially during climb and descent.
6 Landing Altitude Selector
Rotate – select planned landing field altitude. (-1,000 ft. to 14,000 ft. in 50 ft.
increments).
7 MANUAL Light
Illuminated (green) – pressurization system operating in the manual mode.
8 Alternate (ALTN) Light
Illuminated (green) – pressurization system operating in the alternate automatic
mode:
• Illumination of both ALTN and AUTO FAIL lights indicates a single
controller failure and automatic transfer to ALTN mode
• pressurization mode selector in ALTN position.
September 15, 2016
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