IPAS

Question 1

What is the primary pneumatic power source for the Integrated Pressurized Air System (IPAS)?

Answer 1

ENG #1 and ENG #2

Question 2

What is the secondary pneumatic power source for the IPAS?

Answer 2

One ENG or bleed air from single operating engine

Question 3

What is used for external air source for the IPAS?

Answer 3

Aviation Ground Power Unit or AGPU

Question 4

Which components maintain the pressure of low pressure IPAS air?

Answer 4

PRSOVs

Question 5

Which component limits maximum normal bleed air supply temperature to 450 degree Fahrenheit (231 degree celsius)?

Answer 5

Bleed Air Precooler

Question 6

When does the APU load control valve open during APU starts?

Answer 6

95%

Question 7

At what temperature does the overtemperature switch close?

Answer 7

490 degrees F (253 degrees C) sending a signal to the MPD which activates an advisory for display on the EUFD

Question 8

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?

Answer 8

Low Pressure Venturi

Question 9

What does the Environment Control System (ECS) use IPAS air?

Answer 9

Heating the crew stations and the Air Particle Separator

Question 10

What does the Nitrogen Inerting Unit (NIU) do with IPAS air?

Answer 10

Cools, dries, and removes oxygen from IPAS air then routes to the fuel cells in inhibit explosive vapor build up

Question 11

What does the fuel system pressure regulator valve reduce IPAS pressure down to?

Answer 11

19 +/- 3 PSIG

Question 12

Which components control the pressure of high-pressure air?

Answer 12

Primary and Utility hydraulic reservoir pressure regulators

Question 13

What is the purpose of the Engine No 1 and Engine No 2 high-pressure check valves?

Answer 13

Backflow of the stage 5 bleed air from engine to engine

Question 14

The primary and utility hydraulic reservoir pressure regulator reduce high-pressure bleed air to what pressure?

Answer 14

31 +/- 3 PSIG

Question 15

Where are the bleed air controls located?

Answer 15

Aircraft Utility Page

Question 16

When one or both engines are at 101% Np and the APU is still operating, what supplies pressurized air to the low-pressure manifold?

Answer 16

APU

Question 17

When does air from the low-pressure manifold pressurize the primary and utility hydraulic reservoirs?

Answer 17

During APU only operations

Question 18

What does the advisory BLD AIR 1 on the EUFD indicate?

Answer 18

The MP commanded the engine 1 bleed PRSOV OPEN or CLOSED, and it did not move as directed

Question 19

What does the advisory BLD AIR OFF indicate?

Answer 19

Engine one and engine two bleed air have been manually shut off

Question 20

What does the advisory BLD AIR HOT indicate?

Answer 20

MP had detected a bleed air over temperature (>490 degree F)