air management system Flashcards
what does the air management system consist of?
pneumatic system
environmental control system
what does the AMS use bleed air for?
ECS (heating and cooling)
Engine start
pressurization
engine and wing anti-ice
water pressure
hot air leak detection (?)
how many AMS controllers are installed?
One controller with 2 channels which control the respective onside system.
in case of channel failure - the remaining channel is able to control the entire pneumatic, air conditioning and anti-ice system
what provides bleed air for the AMS?
engine bleeds
APU bleed
External pneumatic source
what is external pneumatic air used for?
ECS on the ground
Engine start on the ground
Where is the external ground source panel located?
lower fairing between the wings
what is the primary use for APU bleed air?
ECS on the ground
Engine starting on the ground
Electrical source (< FL330)
Assist with engine start (< FL 210)
bleed source for pressurization, heating and cooling (<15,000 ft MSL)
can engine bleed air flow-back to the APU?
No. a check valve prevents flow-back
where is bleed air tapped from the engines?
6th and 10th stage compressors (EBV (Engine bleed valve) and HSV respectively)
system alternates between valves to regulate an adequate and safe pressure
what is normal pressure for any engine operation
45 PSI
what is the purpose of the pre-cooler
cools the bleed air coming from the engine to the AMS
what cools the pre-cooler?
Ground N1 fan
Flight N1 fan or RAM air
what does the overheat detection system (ODS) observe?
engine bleeds and packs
APU bleed
Plumbing for wing and engine anti-icing system
Do both loops have to function in order to detect on overheat condition?
yes but if one fails, the other will work alone to detect the overheat
how many ECS packs are on the airplane? what provides air for the packs?
2 independent packs (pack 1 and pack 2)
each engine provides bleed air to its respective pack
can a single pack provide adequate temperature control and pressurization?
yes up to FL 310
can a single bleed source power both packs
yes thru the cross bleed valve