M15.7 (thrust Reversers)

Question 1

Does a a/c need a thrust reverser?

Answer 1

No the brakes are sufficing enough

Question 2

How does a reverse thruster produce braking force?

Answer 2

By deflecting exhaust gas in the opposite direction

Question 3

What is the ideal angle for a thrust reverser?

Answer 3

180 degrees

Question 4

At what angle is air deflected forward on a cold stream thrust reverser?

Answer 4

45 to 60 degrees

Question 5

What are the 4 types of thrust reverse systems?

Answer 5

Clamshell
Bucket
Translating cowling
Pivoting door

Question 6

How is the clamshell door operated?

Answer 6

Pneumatically

Question 7

What a/c will you find a clamshell door on?

Answer 7

Old a/c

Question 8

How is the bucket door operated?

Answer 8

Hydraulically

Question 9

On a modern fan reverser what air is deflected?

Answer 9

Cold fan air

Question 10

What is a blocker door?

Answer 10

A door that closes of fan discharge so all fan air only discharges through cascade vanes

Question 11

How is the pivoting door actuated?

Answer 11

Hydraulically

Question 12

What are the negatives on reverser operation?

Answer 12

Doesn’t operate well at low speeds
Compressor can stall
Engine can invest its own thrust
Can cause a air cushion bellow the wing
Whirls up a lot of dust and dirt

Question 13

What is done to the airflow to minimise the disadvantages?

Answer 13

Reverse airflow is matched to the engine position

Question 14

What problem can occur with 4 engine a/c?

Answer 14

Inboard engines can blow into outboard engines

Question 15

What do engines use to direct airflow in the correct direction?

Answer 15

Cascade vanes

Question 16

What must be done to a faulty thrust reverser?

Answer 16

Must be de activated

Question 17

What does the control system do?

Answer 17

Activates thrust reverser and increases engine power for reverse thrust

Question 18

What does the reverser actuation system do?

Answer 18

Moves airflow deflection mechanism by signals from the reverser control system

Question 19

What does the airflow deflection system do?

Answer 19

Deflects air flow in optimum position for safe reveres thrust

Question 20

What does the thrust reverser interlock do?

Answer 20

Ensures engine power is only increased after reverser is fully deployed

Question 21

What 3 parts make up a thrust reverse system?

Answer 21

Control system
Actuation system
Deflection system

Question 22

What are the 2 means of actuating a thrust reverser?

Answer 22

Hydraulic and pneumatic

Question 23

What reverser systems have a actuation system?

Answer 23

Reverse thruster with a large blocker door

Question 24

The pneumatic reverser only used on what reverser systems?

Answer 24

Cascade type
Cam shell type

Question 25

What is the purpose of the locking system?

Answer 25

Ensure reverser is kept locked in its stowed position

Question 26

How does the lock mechanism work?

Answer 26

By using a hook to hold it in place

Question 27

Cascade vanes are bolted to what?

Answer 27

A fixed part of the reverser cowling

Question 28

Cascade vanes can deflect air at what angles?

Answer 28

45degree upwards
45degree downward
90degree straight

Question 29

What happens if you put a RH upward pointing cascade vane on the LH side?

Answer 29

It will point downwards

Question 30

What does a amber indication for the thrust reverser system indicate?

Answer 30

Reverser is moving to deployed or stowed position

Question 31

What 2 methods are available for latching hydraulically operated T/R doors in position?

Answer 31

Latch mechanism
Locks in the actuator

Question 32

What does a reverser unlock message indicate?

Answer 32

Reverser not safe in stowed position

Question 33

What does a green light show?

Answer 33

Reverser gulley deployed so thrust can be applied