Term
| Describe the NORM position of the Cabin Altitude Selector |
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Definition
| Cabin Altitude Controller A or B is selected as the primary controller automatically on alternate flights |
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Term
| What happens if the primary controller selected by the Cabin Altitude Selector fails? |
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Definition
| Automatically selects secondary controller |
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Term
| What action would allow you to gain manual operation of the pressurization system? |
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Definition
Turn both Outflow Manual switches to ON
All automatic cabin altitude control functions are bypassed |
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Term
| How do the cabin altitude controllers calculate a cabin pressurization schedule? |
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Definition
| They use ambient pressure and flight plan data from the FMC |
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Term
| What is maximum cabin altitude in cruise mode? |
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Definition
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Term
| What is the assumed cruise altitude if a cruise altitude is unavailable from the FMC in AUTO? |
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Definition
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Term
| Does the cabin altitude continue to increase or level-off if there is a planned level segment during the climb phase? |
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Definition
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Term
| When do the cabin altitude controllers enter descent mode? |
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Definition
T/D or
Initial descent of ~1,000' |
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Term
| When in descent mode, do the cabin altitude controllers program a positive or a negative pressurization at touchdown? |
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Definition
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Term
| EICAS advisory LANDING ALT |
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Definition
Landing altitude is unavailable from FMC and not set in MAN
Cabin altitude controllers assume a landing altitude of 2000' |
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Term
| How can you gain manual control of the landing altitude, if the airport for takeoff or landing is not in the data base? |
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Definition
Landing Altitude switch (LDG ALT)
MAN (amber) displays on primary EICAS |
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Term
| When does the cabin rate limiter close both outflow valves? |
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Definition
| Cabin altitude exceeds 11,000' |
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Term
| What provides positive pressure relief? |
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Definition
Two positive pressure relief valves
Pack 2 shuts down to assist in relieving pressure |
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Term
| What provides negative pressure relief? |
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Definition
| Negative pressure relief valves in cargo doors |
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