IPAS Flashcards
(21 cards)
What is the primary pneumatic power source for the Integrated Pressurized Air System (IPAS)?
ENG #1 and ENG #2
What is the secondary pneumatic power source for the IPAS?
One ENG or bleed air from single operating engine
What is used for external air source for the IPAS?
Aviation Ground Power Unit or AGPU
Which components maintain the pressure of low pressure IPAS air?
PRSOVs
Which component limits maximum normal bleed air supply temperature to 450 degree Fahrenheit (231 degree celsius)?
Bleed Air Precooler
When does the APU load control valve open during APU starts?
95%
At what temperature does the overtemperature switch close?
490 degrees F (253 degrees C) sending a signal to the MPD which activates an advisory for display on the EUFD
What is mounted directly on the engines at the low-pressure bleed air port and connects to the IPAS ducting leading to the engine bleed air PROSOVs?
Low Pressure Venturi
What does the Environment Control System (ECS) use IPAS air for?
Heating the crew stations and the Air Particle Separator
What does the Nitrogen Inerting Unit (NIU) do with IPAS air?
Cools, dries, and removes oxygen from IPAS air then routes to the fuel cells and inhibit explosive vapor build up
What does the fuel system pressure regulator valve reduce IPAS pressure down to?
19 +/- 3 PSIG
Which components control the pressure of high-pressure air?
Primary and Utility hydraulic reservoir pressure regulators
What is the purpose of the Engine No 1 and Engine No 2 high-pressure check valves?
Backflow of the stage 5 bleed air from engine to engine
The primary and utility hydraulic reservoir pressure regulator reduce high-pressure bleed air to what pressure?
31 +/- 3 PSIG
Where are the bleed air controls located?
Aircraft Utility Page
When one or both engines are at 101% Np and the APU is still operating, what supplies pressurized air to the low-pressure manifold?
APU
When does air from the low-pressure manifold pressurize the primary and utility hydraulic reservoirs?
During APU only operations
What does the advisory BLD AIR 1 on the EUFD indicate?
The MP commanded the engine 1 bleed PRSOV OPEN or CLOSED, and it did not move as directed
What does the advisory BLD AIR OFF indicate?
Engine one and engine two bleed air have been manually shut off
What does the advisory BLD AIR HOT indicate?
MP had detected a bleed air over temperature (>490 degree F)
IPAS pressurizes, regulates, and distributes air to:
(FUNIWHALE)
-Fuel boost and transfer pumps
-Utility receptacle
-Nitrogen Inerting Unit (NIU)
-Ice detect probe aspirator
-Windshield defog
-Hydraulic reservoirs (Only high pressure system)(31 +/- 3 PSI)
-Air Turbine Starter
-Louver Doors
-ECS
