Chapter 8: Powerplant Installation

Question 1

what does nacelles do?

Answer 1

provide smooth aerodynamic flow with minimum drag, protected components on engine

Question 2

what does nacelle consist of?

Answer 2

1) skin cowlings
2) firewall
3) engine mounts

Question 3

engine accessibility reasons

Answer 3

1) troubleshooting
2) checking of engine oil level & FOD
3) remove/install components
4) adding oil

Question 4

what does engine firewall do?

Answer 4

isolate location where fire takes place (protects components)

Question 5

what does a pylon do?

Answer 5

transmit loads produced by engine and other loads (side, vertical, gyroscopic, moments)

Question 6

what does pylon houses?

Answer 6

1) fuel
2) hydraulics
3) electrics
4) engine controls

Question 7

what is the engine front mount designed to resist?

Answer 7

translational & rotational forces and moments

Question 8

what is the engine rear mount designed and do?

Answer 8

transmit engine torque load, vertical loads, side loads to pylon, allow thermal growth on engine to move axially

Question 9

purpose of vibration isolators

Answer 9

isolate APU/engine from structure to minimise 2 way transmission of vibration & shock between aircraft and engine

Question 10

components that leak waste to engine drain mast

Answer 10

1) hydraulic pump
2) fuel control unit
3) pneumatic starter
4) fuel drain tank
5) oil tank scupper
6) electric generator
7) starter motor

Question 11

factors affecting auto throttle system

Answer 11

1) flight level
2) flight phase
3) environmental conditions
4) altitude