777 Air Systems Flashcards
What. is the air source for the packs?
- Engines, APU, high pressure ground air.
How.many air conditioning pack controllers are there?
- Two.
Following a pack shut down, how is the pack reset?
- Push the AIR CONDITIONING RESET switch.
Which pack supplies 100% fresh conditioned air to the flight deck?
- The left pack.
Why is the conditioned air in the flight deck maintained at a higher pressure than the cabin?
- To prevent cabin smoke from entering the flight deck.
What is the purpose of the Recirculation Fans?
- Assists the packs to maintain a constant ventilation rate through the cabin.
In standby cooling mode, which messages are displayed on:
a. EICAS.
b. Air synoptic.
- a. PACK MODE (L/R) – Advisory
b. STBY COOLING (amber).
Under what conditions will packs operate continuously in Standby Cooling mode regardless of altitude and temperature?
- Both packs are in standby cooling, or one pack is inoperative with the other in standby cooling.
What determines the pack outlet temperature?
- The zone requiring the coolest temperature.
What is the source of Trim Air?
- Engine bleed air.
Over what range of temperature can the cabin crew adjust the cabin zones about the reference you set?
- Plus/minus 6 degrees (within the range of 18 to 29C).
Are all zones supplied with trim air?
Yes
What temperature is maintained in all zones if a trim air supply is lost?
- An average target temperature.
- Which air conditioning panel switches remain operable following a dual temperature controller failure?
- The pack switches.
- Are the shoulder and foot heaters available on the ground?
No
- Where are the controls for the Aft and Bulk Cargo heat?
- Overhead Maintenance Panel
- What is the source of air for the Aft and Bulk Cargo heating?
- Bleed air.