Note if you are landing at an airport that is at a 4000ft altitude, you want the cabin altitude to be about the same before you 'pop open' the cabin door. When descending from 30,000ft the general overall process is reversed. So if you wanted the cabin to reach 10,000ft just as the a/c reaches 30,000ft, you would want the cabin altitude to climb at a rate of 1000ft/min. The a/c may be climbing to 30,000ft at an average VS of 3000ft/min (just to pick a convenient value). The rate info has to do with how fast the cabin reaches its 10,000ft altitude. The a/c bleed air system is used to provide this pressure differential through the cabin pressure control system. Therefore, to have a cabin altitude of 10,000ft when the aircraft is at 30,000ft requires a cabin differential pressure of 10.1- 4.4 = 5.7 psi. For example, on a standard day at 30,000ft the pressure is about 4.4 psi (pounds per square inch). Pressure drops as altitude increases, so if the a/c is at 30,000ft and the cabin altitude at 10,000ft, the pressure inside the aircraft is greater than outside the aircraft - the difference is the differential pressure. So you can set what you want the cabin's altitude to be, and the rate at which it reaches that altitude. For example, if the a/c is at 30, 000ft you would like the cabin's effective altitude to be something like 10,000ft or below so passengers do not have to wear oxygen masks. The general idea of the cabin pressure system is to maintain the 'effective' altitude of the cabin lower than the aircraft's actual altitude. The Emergency Power switch is on the overhead panel just to the right of the Generator3 switch.
Flightgear autopilot how to#
I don't understand the Cabin Pressure system (selector, controler, how one should select the cabin altitude - #30 and #34 of the Main Panel Information picture)Īs this has been obviously simulated with great care, I would love to learn how to use them. I was not able to find the Emergency Battery SW (after start checklist) I had seen before the recommandation of climb + IAS / versus descent + VS, but I was missing the information that IAS was compatible with ALTSEL.Īnd just discovered that speed "reference marker" was not used for the AP.Īnother unrelated question, if I may : trying to stick to the checklist,
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