Pneumatics

Question 1

What PSI bleed air is supplied for the surface de-ice system?

Answer 1

18 PSI

Question 2

Can only one engine supply enough bleed air for the pneumatic and vacuum systems?

Answer 2

Yes

Question 3

Where is the bleed air ducted to when it leaves the engine?

Answer 3

The respective L or R flow control unit

Question 4

What type of line tees off the engine bleed-air line forward of the firewall and flow control unit?

Answer 4

A pressure supply line

Question 5

What does the pressure supply line contain pneumatic pressure for?

Answer 5

To operate surface de-ice system, rudder boost, door seal, and flight hour meter

Question 6

What is used to change the pressure to a vacuum to operate the gyro instruments?

Answer 6

An ejector

Question 7

What unit is used to regulate the mixture of engine bleed air for pressurization along with the ambient air?

Answer 7

The flow control unit

Question 8

What are things the pressurization air is used for?

Answer 8

Heating, cooling, pressurizing

Question 9

What’s the suction gage indicate?

Answer 9

The gyro suction (vacuum system)

Question 10

What does the pneumatic pressure gage indicate?

Answer 10

Air pressure available to the de-ice distribution valve, vacuum system, bleed air warning, rudder boost, hour meter, and door seal.

Question 11

What’s the purpose of the bleed air warning system?

Answer 11

Used to alert the pilot when a pressurization line or pneumatic line ruptures

Question 12

At what temperature will the bleed air warning system alert?

Answer 12

204 degrees F

Question 13

How does the bleed air warning system alert?

Answer 13

Warning lights labeled L BL AIR FAIL or R BL AIR FAIL

Question 14

What could a severe bleed air leak do to engine power and ITT?

Answer 14

Decreased torque, increased ITT

Question 15

If the bleed air valve is in the INST AND ENVIR OFF position, what should you look for?

Answer 15

Increase in torque and decrease in ITT

*would indicate a severe leak was isolated

Question 16

What should be done anytime a warning light illuminates?

Answer 16

Respective bleed air valve switch positioned to INST AND ENVIR OFF

Question 17

What switches controls the pressurization of the cabin?

Answer 17

BLEED AIR VALVES

Question 18

What are the 3 positions?

Answer 18

OPEN, ENVIR OFF, and INST & ENVIR OFF

Question 19

What happens when the bleed air valve switches are in OPEN?

Answer 19

Environmental flow control unit and pneumatic instrument air valve open

Question 20

What happens when the bleed air valve switch is in the ENVIR OFF position?

Answer 20

Environmental flow control unit closes and pneumatic instrument air valve remains open

Question 21

What happens when the bleed air valve switches are in the INST & ENVIR OFF position?

Answer 21

Environmental and pneumatic flow valves are closed

Question 22

When does the door seal inflate?

Answer 22

After liftoff

Question 23

What landing gear safety switch controls the door seal 4PSI valve?

Answer 23

The left

Question 24

What is required to make the flight hour meter work?

Answer 24

Bleed air and DC power

Question 25

What landing gear squat switch controls the hour meter?

Answer 25

The right

Question 26

What’s the limitations of the bleed air system for the: Pneumatic Gage? Vacuum gage?

Answer 26

Pneumatic: 12-20PSI

Vacuum:
15-30k ft MSL — 3.0-4.3in Hg
SL - 15k ft MSL — 4.3-5.9in Hg

Question 27

What’s 2 malfunctions could lead to a lack of sufficient heat in cruise that cannot be remedied by switch from AUTO to MAN HEAT?

Answer 27

A dead flow pack or because a bypass valve motor has failed