11.3.5 Nacelles And Pylons

Question 1

What is a nacelle

Answer 1

Entire engine cowling system which includes nose cowl, hinged removable cowl panels, exhaust nacelle and thrust reverser

Question 2

Functions of nacelle

Answer 2

• Smooth airflow around and into engine
• prevent engine damage
• gives additional strength to engine structure
• permit serice door access

Question 3

Hinged cowling

Answer 3

• Usually quick release latches

* Divided into 2 sections: cold section and hot section

Question 4

Function of hot section

Answer 4

• fire protection

Question 5

Plyons

Answer 5

•connects engine to wing

Question 6

Where are pylons mounted

Answer 6

Under wing or or at rear fuselage

Question 7

Functions of pylon

Answer 7

• Enable routing and attachments of systems with the engine

* serves as fire barrier between engine and aircraft structure

Question 8

Pylon primary section function

Answer 8

Carrys the loads

Question 9

What are firewalls made of

Answer 9

Stainless steel and titanium

Or thermoplastics

Question 10

Function of fire seal

Answer 10

• Prevent entry of combustible matter into areas where ignition may occur
• contains fire in one area

Question 11

Engine mounts

Answer 11

• are failsafe due to multiple load paths

Question 12

3 engine attachment configurations used to transport aircraft

Answer 12

• wing mounted
• tail side mounted
• tail mounted

Question 13

ATA chapter for nacelles

Answer 13

54

Question 14

What loads must engine mounts be able to carry

Answer 14

Side , vertical, thrust, and torque loads

Question 15

What are stub wings

Answer 15

Side pylons

Question 16

Material used for firewall

Answer 16

Titanium and steel

Question 17

Whici engine mount takes thrust loads

Answer 17

Forward mount