Pneumatics

Question 1

True or False: The Pneumatics system provides air for airstair door seal pressurization?

Answer 1

True

Question 2

True or False: The Pneumatics Electronic Control Unit (ECU) uses left and right digital channels for control with no associated backup channels.

Answer 2

False

Question 3

Prior to engine start, what source provides bleed air for the pneumatic system?

Answer 3

APU

Question 4

When BLEED 1 or BLEED 2 switches are selected OFF, what is the result in the associated bleed air system?

Answer 4

• The nacelle SOV closes

- HP SOV closes

Question 5

How many engine bleed ports are used to supply bleed air to the pneumatic system?

Answer 5

2 for each engine

Question 6

After engine start, bleed air is primarily provided by what sources?

Answer 6

Left and Right Engines

Question 7

True or False: Bleed air is continuously supplied to the deicing system, regardless of flightdeck bleed switch positions.

Answer 7

True

Question 8

True or False: If the DC starter/generator were to fail, the engines can still be started using APU bleed air.

Answer 8

False

Question 9

If one or more protective bleed air sensors exceed normal values, what will the ECU system do?

Answer 9

Takes source offline by closing SOV

Question 10

The ECU and _____ are used to determine whether the HP port or the LP port will be used for bleed air.

Answer 10

Power Lever Position

Question 11

During lower power settings, the ECU uses which port(s) for bleed air?

Answer 11

HP Port

Question 12

During higher power settings, the ECU uses which port(s) for bleed air?

Answer 12

LP Port

Question 13

Prior to engine start, the bleed control switches should be in the _____ position?

Answer 13

Off

Question 14

When the engines are running, the bleed control switches should be set to what position?

Answer 14

1 and 2 ON

Question 15

How many different positions are there on the bleed flow control selector?

Answer 15

3

Question 16

Which of the following does not use bleed air?

Answer 16

Propeller Pitch Control, Engine Starter

Question 17

Which of the following is NOT a condition that will cause the pneumatics ECU to automatically shut down the affected bleed system?

Answer 17

Failure of the HP SOV

Question 18

The ECU uses _____ to determine whether the HP port or the LP port will be used for bleed air?

Answer 18

Power Lever Position

Question 19

Which conditions will cause the ECU to shut down the bleed air system?

Answer 19

Over Temp, Over Pressure, Bleed Leak

Question 20

True or False: APU bleed air and engine bleed air can supply bleed air to the environmental system simultaneously.

Answer 20

False