PNEUMATICSMultiple-choice exercise

Top of Form1APU bleed air used to start NO.1 engine is

Routed direct to the No.1 engine starter valve.

Routed via the No. 1 engine bleed air valve to the No.1engine starter valve.

Controlled by the modulating and shut-off valve.

2The amount of fan air that is ducted through the pre-cooler is controlled by the

Thermostatic pre-cooler valve.

Modulating and shut-off valve.

Ram air controller

3With the Isolation Valve switch in AUTO, both engine bleed switches ON and both Air Conditioning Pack switches selected to AUTO or HIGH

The isolation valve will be open.

The isolation valve will be closed when the flaps areextended.

The isolation valve will be closed.

4The DUAL BLEED light will be on

With the airconditioning panel set for a bleeds-off takeoff.

With No. 1 and No. 2 bleed valves closed and APU bleed valve open.

With No. 2 engine bleed valve open, the isolation valve open and APU bleed valve open.

5An engine BLEED TRIP OFF light will illuminate

Only if engine bleed air temperature exceeds a predetermined limit.

When engine bleed air temperature or pressure exceeds a predetermined limit.

Only if engine bleed air pressure exceeds a predetermined limit.

6The pneumatic duct pressure gauge

Indicates pressure in left and right pneumatic ducts.

Is DC powered.

Indicates pressure available for engine anti-icing.

7With a ground pneumatic source connected and the isolation valve switch selected to CLOSE

The pneumatic pressure would be indicated by both the left and right pointers on the pneumatic duct pressure indicator.

The pneumatic pressure would be indicated by the left hand pointer on the pneumatic duct pressure indicator.

The pneumatic pressure would be indicated by the right hand pointer on the pneumatic duct pressure indicator.

8The sources of engine bleed are

5th and 9th stages of the compressor section.

5th and 9th stages of the turbine section.

5th and 13th stages of the fan section.

9The 9th stage modulating and shut-off valve

Will open if the 5th stage air is insufficient in maintaining proper pressure.

Will open if the APU is insufficient in maintaining proper pressure.

Is open at all times irrespective of 5th stage air pressure output.

10The engine bleed valves are

Pneumatically activated and operated.

AC activated and pneumatically operated.

DC activated and pneumatically operated.

11Water tank pressurisation in flight is normally provided by

Bleed air from the APU.

5th and 9th stage air from the No. 2 engine.

5th and 9th stage air from the No. 1 engine.

12Both hydraulic reservoirs are pressurised by

Air from the pneumatic manifold.

Separate engine bleeds directly to the reservoirs.

5th and 9th stage air from engine No. 2 only.

13The source air ducted through the pre-cooler is

Pressure controlled ram air.

Fan air.

5th stage bleed air.

14The A.P.U. bleed valve is

AC controlled and pneumatically operated.

Pneumatically controlled and operated.

DC controlled and pneumatically operated.

15The isolation valve is

AC controlled and pneumatically operated.

AC operated.

DC operated.

16What initial action is required in the event of a WING BODY OVERHEAT light illuminating.

Close the isolation valve and switch off the associated engine bleed.

Close the isolation valve and switch off the associated air-conditioning pack.

Switch off the associated engine bleed.

17The DUAL BLEED light is illuminated. Engine thrust

Should be limited to idle.

Should be limited to 40% N1.

Is unlimited. Dual bleed light is advisory only.