PNUEMATICS & A/C System

Question 1

How is BLEED AIR normally supplied to the CENTER Duct?

Answer 1

From the Crossover manifold which is supplied from either engine or the APU

Question 2

Which Systems use BLEED AIR from the CENTER Duct?

Answer 2

1. ADP (Air Driven Pump) for C HYD Sys
2. AFT & BULK Cargo Compartment heat
3. C HYD Sys Resv

Question 3

If the OVHT warning light illuminated simultaneously with the ENG BLEED OFF light, what has happened?

Answer 3

A Bleed Air malfunction has occurred (excessive bleed air temp) and the ENG BLEED VALVE has closed

Question 4

How are the BLEED VALVES actuated?

Answer 4

Electro-pneumatic- Electronically charged, pneumatically operated

Question 5

There are LOOPS outside of each duct, if hot air is sensed, what light will illuminate?

Answer 5

DUCT LEAK

Question 6

If you see the OVRHT light, what will the aircraft attempt to do?

Answer 6

Close the ENG BLEED VALVE

Question 7

On the Cabin Rate knob, there is a tick mark. What does this mean?

Answer 7

Cabin rate between 300-500 FPM

Question 8

Which temperature zone controls the output of the air conditioning PACs during automatic temperature control?

Answer 8

The compartment demanding the coolest temperature

Question 9

What is the purpose of the TRIM AIR SYSTEM?

Answer 9

Adds warm air to control individual zone

temperature as required by the Zone

Temperature Controller