IPAS

Question 1

What does IPAS stand for?

Answer 1

Integrated Pressurized air system

Question 2

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.

Answer 2

50, 100

Question 3

What is the purpose of the low pressure venturi?

Answer 3

limits the flow of bleed air to 6.5% of the total engine compressor core flow in the event of an IPAS leak.

Question 4

What is located on both engines and the APU between the source and the IPAS ducting?

Answer 4

Pressure regulating shut off valve (prsov)

Question 5

Which component limits maximum normal bleed air supply temperature to 450F?

Answer 5

Bleed air pre-cooler

Question 6

What are the low pressure IPAS Users?

Answer 6

(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

Question 7

What is the psi of the lowe pressure IPAS users?

Answer 7

25 +/- 3, fuel system uses 19 +/- 3 psi

Question 8

What are the high pressure IPAS users?

Answer 8

Primary and utility hydraulic reservoirs

Question 9

Why does the hydraulic need IPAS?

Answer 9

To prevent pump cavitation and foaming

Question 10

What is the psi of the high pressure psi?

Answer 10

31 +/- 3 PSI

Question 11

when the APU is on and both engine are running which supplies IPAS air?

Answer 11

Any time the APU is on, it provides all the IPAS air..

Question 12

What regulates IPAS from each engine and from the APU?

Answer 12

PRSOV on each engine, Load Control Valve from the APU

Question 13

To complete a cross-bleed engine start what NG must the other engine achieve?

Answer 13

95%

Question 14

At what Ng percentage with the SP display “ATS Hang”?

Answer 14

68% Ng

Question 15

EP ATS1/2 Hang?

Answer 15

ENG start Switch to IGN ORIDE, Then Off

Question 16

EP Bleed At Hot?

Answer 16

Identify high TGT engine and turn off affected bleed air.

Question 17

What keep IPAS from flowing backwards through the system?

Answer 17

A series of one way Check Valves

Question 18

What does the message “ENG1/2 BLD Air Fail” mean?

Answer 18

The PRSOV does not move as directed by the SP

Question 19

Where does the engine bleed air PRSOV get its pressure?

Answer 19

Down stream from the 5 stage of the Engine compressor

Question 20

What is the normal temperature range for IPAS air?

Answer 20

450-500 degrees F

Question 21

when will the “Bleed air Hot” message display?

Answer 21

If the over temperature switch detects greater that 490 degrees

Question 22

Where does the HYD system get IPAS when the engines are running ?

Answer 22

From the High pressure manifold that is connected directly to the engine diffuser.

Question 23

Where does the HYD system get its IPAS when only on the APU?

Answer 23

From the IPAS low pressure manifold to the reservoirs