Timeline for Why does the cabin pressurisation switch have a manual mode?
Current License: CC BY-SA 3.0
10 events
| when toggle format | what | by | license | comment | |
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| Sep 29, 2019 at 5:15 | comment | added | Ralph J♦ | @Sean Because you have the switch on the pressurization control panel. Pulling circuit breakers to do what you have switches for, has gotten crews in serious trouble, because it's far too easy to lose track of what systems you no loner have working. And the interrelationships between them. | |
| Sep 28, 2019 at 23:35 | comment | added | Vikki | Regarding unpressurised ferry flights, why not simply pull the pressurisation system's circuit breakers? | |
| Nov 15, 2018 at 16:47 | comment | added | Ralph J♦ | @Sean The inverter provides some AC power, but the load to move the outflow valve may be more than it can deliver. Going back to the analog pressurization panel, the "Stby-AC" mode moved the valve rapidly, while the Stby-DC mode was much slower. My inference there is that the AC motor used more power, since AC power is typically plentiful, while the DC motor used less since its envisioned use case was to run from the battery. | |
| Nov 14, 2018 at 22:08 | comment | added | Vikki | Wouldn't AC power be available even when on battery, via the emergency inverters? | |
| Dec 30, 2015 at 13:47 | comment | added | mins | Also in case of ditching, it may be desirable to close the relief valves to extend buoyancy time. | |
| Dec 30, 2015 at 7:45 | vote | accept | Fabrizio Mazzoni | ||
| Dec 30, 2015 at 1:10 | history | edited | Ralph J♦ | CC BY-SA 3.0 |
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| Dec 30, 2015 at 1:05 | history | edited | Ralph J♦ | CC BY-SA 3.0 |
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| Dec 30, 2015 at 0:59 | history | edited | Ralph J♦ | CC BY-SA 3.0 |
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| Dec 30, 2015 at 0:53 | history | answered | Ralph J♦ | CC BY-SA 3.0 |