Air Conditioning & Pressurization Flashcards
How is the Boeing 737 pressurized?
The Boeing 737 utilizes the air conditioning/pressurization system, known as AC Packs, which combines outside cold air with hot bleed air from the engines, compresses it, and pumps it into the cabin through the AC Packs. Cabin pressure is regulated by outflow valves.
How many Air Conditioning Packs are on the 737?
2 – left and right.
How many outflow valves are on the 737?
5 total (MOPPN):
* 1 Main outflow valve
* 1 Overboard exhaust valve
* 2 Pressure relief valves
* 1 Negative pressure release valve
Which outflow valve can be manually closed on the 737?
The main outflow valve can be closed if necessary.
Which cargo area is heated and carries live animals?
The forward cargo area.
What is the maximum altitude the 737 may be dispatched to with 1 AC pack inop?
25,000 ft (Always check the MEL!)
What is the maximum altitude the 737 may be dispatched to with both AC packs inop?
10,000 ft (Always check the MEL!)
If the 737 loses both AC packs inflight, what altitude does it need to operate at and how would you know?
14,000 ft. Check the AFM!
Are you able to dispatch a flight with 1 or both AC packs inop?
Yes, but always check the MEL!
Which engines provide bleed air to the AC packs?
Both main engines.
Where are the AC packs located on the 737?
Located in the belly (underside) of the aircraft, just forward of the main landing gear.
