15.19

Question 1

What is the name of the fairing the engine is housed in?

Answer 1

Nacelle

Question 2

What type of aerodynamic smoothness must parts of the engine cowling have?

Answer 2

Class 1, maximum smoothness

Question 3

What is the other class of smoothness required on some parts of the engine cowling?

Answer 3

Class 2

Question 4

What does the acoustic lining do on engine cowlings?

Answer 4

Helps reduce noise

Question 5

What are the two angles you can latch a cowling open at?

Answer 5

40 or 55 degrees

Question 6

What does the fan reverse cowling do to airflow?

Answer 6

Directs it in the opposite direction

Question 7

Is the fan reverse cowling heavy or light?

Answer 7

Heavy

Question 8

What is the reverse cowling opened with assistance of?

Answer 8

Hydraulic pressure from hand pump

Question 9

What problems so reverse cowlings face with aerodynamics when shut?

Answer 9

They don’t line up and put high loads on engine inlet.

Question 10

What does high aerodynamic load on a cowling and deformation cause?

Answer 10

Tip rub with uneven clearances on both sides

Question 11

How to you prevent aerodynamic problems with the reverse cowling?

Answer 11

Use a stiff case

Question 12

What fire protection does the fan thrust reverse cowling have?

Answer 12

Fire protective coating, fire seal

Question 13

What engine section does the core cowling cover?

Answer 13

Hot section

Question 14

With acoustic panels what materials are used in low and high temperature areas?

Answer 14

Composites in low temp areas and fibrous metallics in high temp areas

Question 15

How is the pressure relief valve held in the closed position?

Answer 15

By a spring

Question 16

What are the names of the two mounts that connect the engine to the wing?

Answer 16

Aft and fwd mount

Question 17

What engine mount is engine thrust transferred through?

Answer 17

Fwd mount

Question 18

What do the engine attachment bolts carry? Load wise

Answer 18

All vertical loads

Question 19

Is the forward engine mount fail safe?

Answer 19

Yes

Question 20

What loads does the aft mount transfer?

Answer 20

Vertical and side loads

Question 21

How is the engine secured to the aircraft upper nacelle?

Answer 21

Resilient rubber mounts and links, and reduce vibration

Question 22

If there is pitting or cracking in the mount what happens?

Answer 22

Has to be replaced

Question 23

Connectors on modern aircraft have how many threads?

Answer 23

3 separate threads

Question 24

What are the 3 methods for lifting an engine?

Answer 24

Bootstrap, overhead crane, uplift loader

Question 25

Explain the bootstrap engine lifting method

Answer 25

Uses a sling and beam and can be used on any engine

Question 26

Explain the engine lifting crane supported method

Answer 26

Uses a crane and a sling, expensive but 30% more effective than bootstrap

Question 27

Explain the uplift loader engine lifting method

Answer 27

Very expensive, but 40% time reduction to bootstrap

Question 28

How are control lever knobs identified

Answer 28

By their shape or colour

Question 29

What does the HP shut off valve allow?

Answer 29

Isolate fuel flow to burners

Question 30

What should rigging pins always have?

Answer 30

Red flag

Question 31

What do engines have to drain fluid overboard?

Answer 31

Drain system

Question 32

What are the 2 components of a drain system?

Answer 32

Drain line and module assembly

Question 33

Fluid leaks are collected from…

Answer 33

All drive pad seals on the gearbox

Question 34

Where are drain outlets found on most aircraft?

Answer 34

Pylon