Leap-1A - 75

Question 1

Within the air system, which is the only one that uses an RVDT?

Answer 1

SB/BAI valve

Question 2

Describe the operation of the SB/BAI valve?

Answer 2

Between 0% and 22% - Anti-ice is supplied only

Above 22% - Anti-ice and start bleed air is supplied

Question 3

Where does the HPC stage 7 air go from the SB/BAI valve with regards to anti-ice?

Answer 3

Exhausts from the flow splitter fairing through the 188 notches located on the forward fairing lip

Question 4

When would you expect the MTC valve to be open?

Answer 4

At high power settings, where there is no reduction of cooling air flow to the HPT 1st stage

Question 5

Why do the EEC cooling fans (if fitted) have a check valve?

Answer 5

Prevents reverse Δ pressure in flight from allowing warm fan case air to be drawn over the EECs

Question 6

When will the EEC cooling fans (if fitted) operate?

Answer 6

• EEC units temperature > 90°C
• AIrcraft is on the ground
• Aircraft’s speed is under Mach 0.1

Question 7

What happens if one of the EEC cooling fans (if fitted) is unserviceable?

Answer 7

Other cooling fan has the capacity to supply both with sufficient cooling

Question 8

Describe the operation of the VBVs?

Answer 8

Door assemblies located around the fan hub are mechanically moved inwards by an actuating ring, crank assemblies and two actuators

Question 9

What do the VBVs do?

Answer 9

Controls the airflow leaving the LPC booster before it is fed into the HPC

Question 10

How many VBV actuators are there?

Answer 10

2

Question 11

Typically, when will the TBV be open?

Answer 11

During engine decelerations

Question 12

What stage does the TBV bleed?

Answer 12

10th stage air

TENsient bleed valve

Question 13

What is the result of the modification to the TBV system?

Answer 13

Only two ducts on RHS of LPT case which exhaust through TRF

Question 14

How has the MTC been modified?

Answer 14

Now only single valve on LHS actuator/valve

Question 15

In what state can the MTC be locked?

Answer 15

Open

Question 16

What is the Core Compartment Cooling (CCC)?

Answer 16

Holes in core panels