Chapter 2 - Air Systems Flashcards
Does the compartment INOP light illuminate if the temperature control is OFF or trim air is OFF ?
Yes.
What is the meaning of the pack INOP light ?
- Pack overheat
- Fault
What is the meaning of the PACK OFF light ?
Pack valve is closed.
Does the recirculation INOP light illuminate if the recirculation switch is OFF ?
Yes.
How is the air warmed from the should and foot heaters ?
Electrically.
When is the equipment cooling NO COOLING light illuminated ?
Only in OVRD mode. No reverse air flow is being delivered !
What is the approximate ROC and ROD of the cabin altitude when the auto rate control is set at the index mark ?
+500 fpm, -300fpm
When does the cabin pressurization AUTO INOP illuminate ?
When both controllers are inop or when MAN has been selected.
When does the CABIN ALT light extinguish again ?
When cabin altitude is less than 8,500ft.
When does the APU VALVE light illuminate ?
Valve disagreement.
What is the meaning of the engine BLEED light ?
Bleed overpressure. The HPSOV or/and PRV are open, and should be closed.
Which has priority: high bleed air demand or high pack output ?
high bleed air demand. In this situation, high pack output is not possible.
What does the standby N(ormal) pack control do ?
Delivers constant, moderate temperature air.
How is temperature controlled with trim air OFF ?
Average air temperature for all zones.
What is the difference in equipment cooling on the ground or in-flight ?
On the ground, the supply and exhaust fan are active, hot air is expelled overboard if needed. In-flight it is normally only recirculated using the exhaust fan.
What is the normal cargo temperature when heated ? What about the vented bulk cargo temperature ?
- 7 deg
- 18 deg
When does the cargo OVHT light illuminate ?
> 32deg, the heating shutoff valve is automatically closed.
What happens with cabin pressure during T/O ?
Slight positive pressure
What happens with cabin pressure shortly before landing ? And at touchdown ?
Cabin pressure slightly below landing altitude. At touchdown, the outflow valve opens.
When is the outflow valve automatically closed ?
When cabin altitude > 11,000ft, in both automatic and manual modes.
Do the engine bleed valves close automatically under certain normal operations ?
Yes. (low demand on the ground, engine start,..)
Is reverse air flow to the APU possible ?
No, because of a check valve.
Until which altitude is APU bleed available ?
17,000 ft.
Are the L/R isolation valve normally open ?
No, normally closed, except for engine start.
Do the HPSOV and PRV normally close when the engine bleed air valves closes ?
Yes.
Engine bleed air valve is closed, but engine anti-ice is activated. Is EAI available ?
Yes, the PRV opens but the engine bleed air valve remains closed.
Which side of the bleed air system is ground pneumatic air added ?
To the L side, between the L isolation valve and the L pack.
Is reverse thrust affected if the respective engine bleed valve is closed ?
Yes, it may be affected. The PRV is located before reverse thrust bleed air, and may be closed.
