Flashcards in IPAS Deck (23):
What does IPAS stand for?
Integrated Pressurized air system
The primary IPAS air source is bleed air from both engines when both engines are operating. Each engine supplies approximately ___% of the IPAS air required by the using systems. Either engine is capable of supplying ____% of the pressurized air for the IPAS.
What is the purpose of the low pressure venturi?
limits the flow of bleed air to 6.5% of the total engine compressor core flow in the event of an IPAS leak.
What is located on both engines and the APU between the source and the IPAS ducting?
Pressure regulating shut off valve (prsov)
Which component limits maximum normal bleed air supply temperature to 450F?
Bleed air pre-cooler
What are the low pressure IPAS Users?
(1) Environmental Control System (ECS)
(2) Engine Air Turbine Starters (ATS)
(3) Fuel system components
(4) Ice detector probe
(5) Nitrogen Inerting Unit (NIU)
(6) Engine firewall/cooling
(7) Utility receptacle
(8) Canopy defog
What is the psi of the lowe pressure IPAS users?
25 +/- 3, fuel system uses 19 +/- 3 psi
What are the high pressure IPAS users?
Primary and utility hydraulic reservoirs
Why does the hydraulic need IPAS?
To prevent pump cavitation and foaming
What is the psi of the high pressure psi?
31 +/- 3 PSI
when the APU is on and both engine are running which supplies IPAS air?
Any time the APU is on, it provides all the IPAS air..
What regulates IPAS from each engine and from the APU?
PRSOV on each engine, Load Control Valve from the APU
To complete a cross-bleed engine start what NG must the other engine achieve?
At what Ng percentage with the SP display "ATS Hang"?
EP ATS1/2 Hang?
ENG start Switch to IGN ORIDE, Then Off
EP Bleed At Hot?
Identify high TGT engine and turn off affected bleed air.
What keep IPAS from flowing backwards through the system?
A series of one way Check Valves
What does the message "ENG1/2 BLD Air Fail" mean?
The PRSOV does not move as directed by the SP
Where does the engine bleed air PRSOV get its pressure?
Down stream from the 5 stage of the Engine compressor
What is the normal temperature range for IPAS air?
450-500 degrees F
when will the "Bleed air Hot" message display?
If the over temperature switch detects greater that 490 degrees
Where does the HYD system get IPAS when the engines are running ?
From the High pressure manifold that is connected directly to the engine diffuser.