V2500 - ATA 75

Question 1

What component controls the single actuator of the VSV system, under the control of the EECs?

Answer 1

Electro-hydraulic servo valve (torque motor & servo valve)

Question 2

What are the components of the VSV actuator?

Answer 2

• Constant pressure valve
• Dual wound torque motor
• Servo valve
• LVDT

Question 3

Which air control system is EEC controlled using muscle air?

Answer 3

Handling bleed valves

Question 4

What is the failsafe condition of the handling bleed valves?

Answer 4

Spring loaded open

Question 5

Which handling bleed valve is also connected to the customer bleed air?

Answer 5

7c

Question 6

As you look forward, which of the BSBV actuators is the master?

Answer 6

Left

Question 7

What position will the BSBV be in when starting?

Answer 7

Fully open

Question 8

Which ACC butterfly valve can move to the reverse open position?

Answer 8

LPT valve

Question 9

What stage of air is used to seal the #4 bearing?

Answer 9

12th stage air

Question 10

How many unison rings are moved by the crankshaft in the VSV?

Answer 10

4

Question 11

What is the purpose of the wrenching flat point on the crankshaft assembly of the VSV?

Answer 11

Used to put the system into high-speed position for the insertion of the rigging pins

Question 12

When is the BSBV fully open?

Answer 12

• Starting
• Deceleration
• Reverse thrust

Question 13

What input signals does the EEC monitor to control the opening and closing of the ACC valve?

Answer 13

• Corrected N2
• Altitude

Question 14

Describe the Turbine Cooling Air (TCA) system?

Answer 14

Four passive pipes pass HPC air to the turbine case for cooling purposes

Question 15

What does the continuous flow adaptor do?

Answer 15

Supplies supplemental air, from the HPC 10th stage, to cool the stage 2 blades and the HP 1 turbine disc bore

Question 16

What are the locations of the components for the Fan Case (Zone 1) cooling?

Answer 16

• NACA duct on top of the intake provides cooling and ventilation
• Air is exhausted through grills in the bottom of the Fan Cowl Doors (FCD)