Cabin Pressurization Panel Flashcards

1
Q

OFF SCHED DESCENT light

A
  • aircraft has started descent at least 1,000 ft prior to reaching the altitude set in the FLT ALT window
  • if the FLT ALT indicator is changed, the automatic abort capability to the original takeoff field elevation is cancelled
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2
Q

ALTN light

A
  • indicates pressurization system operating in alternate mode
  • selected automatically or manually
  • if the mode selector is in AUTO, illumination of both the ALTN and AUTO FAIL lights indicate a single controller failure and automatic transfer to the ALTN mode
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3
Q

MANUAL light

A
  • pressurization system operating in MANual mode, selected with the mode switch
  • operate the outflow valve to maintain proper cabin altitude and cabin rate of change
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4
Q

DIGITAL PRESS MODE SELECTOR
AUTO -
ALTN -
MAN -

A

AUTO
- automatic pressurization control (normal mode of operation) uses a DC motor
ALTN
- automatic pressurization control (alternate mode of operation) uses another DC motor
- second of two digital cabin pressure controllers, so auto mode has dual redundancy
- the green ALTN light illuminates if ALTN is selected
MAN
- overrides and bypasses the two cabin pressure controllers
- has its own valve motor system for triple redundant architecture
- 28v dc bat bus power source

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5
Q

AUTO FAIL light

A
  • illuminates if automatic pressurization system failure detected:
  • indicates a single controller failure when ALTN light is also illuminated
  • indicates a dual controller failure when illuminated alone
  • MASTER CAUTION and AIR COND annunciator lights come on
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