Term
How many sources of IPAS air?
What are they? |
|
Definition
How many sources of IPAS air? THREE
What are they? APU AND BOTH ENGINES
|
|
|
Term
| What is the hierarchy of supplying IPAS air? |
|
Definition
| What is the hierarchy of supplying IPAS air? The APU supplies 100% of IPAS air when running, regardless of engine status. Engines only provide IPAS air when APU is off. Either engine can supply 100% IPAS air by itself, but share 50% of the load when both are running. |
|
|
Term
| What is the general flow of IPAS air? |
|
Definition
What is the general flow of IPAS air?
Source (APU/ENG) --> PRSOV --> IPAS Manifold --> IPAS users |
|
|
Term
| At what pressure does IPAS air leave the engines? |
|
Definition
| At what pressure does IPAS air leave the engines? Normally between 45-55 psi |
|
|
Term
| The engine bleed air PRSOV regulates the IPAS air from 45-55 psi down to what? |
|
Definition
| The engine bleed air PRSOV regulates the IPAS air from 45-55 psi down to what? 25 psi, +/- 3 |
|
|
Term
What component(s) connect the PRSOVs together?
What do they do? |
|
Definition
What component(s) connect the PRSOVs together? Flow share sense lines
What do they do? Ensure that both engines are supplying an equal amount of bleed air |
|
|
Term
| At what APU speed does the APU load control valve allow IPAS air from the APU into the IPAS manifold? |
|
Definition
| At what APU speed does the APU load control valve allow IPAS air from the APU into the IPAS manifold? 95% |
|
|
Term
| For engine cross-bleed starts, what Ng speed must be maintained on the running engine? |
|
Definition
| For engine cross-bleed starts, what Ng speed must be maintained on the running engine? 95% |
|
|
Term
| What are the low pressure IPAS users? |
|
Definition
What are the low pressure IPAS users?
ECS
ATS
Fuel system (19 psi +/-3)
Ice detector probe
NIU
Engine firewall/cooling
Utility receptacle
Canopy Defog |
|
|
Term
At what pressure is IPAS air supplied to the hydraulic manifolds?
What does this prevent?
|
|
Definition
At what pressure is IPAS air supplied to the hydraulic manifolds? 31 psi +/- 3
What does this prevent? Pump cavitation and foaming
|
|
|
