Engines

Question 1

What engines?

Answer 1

4x PW F117 -PW - 100 fly by wire turbofan engines

Dual Spool
Single fan stage
High bypass 6:1
Max flat rated thrust 40,440 pounds (at sear level)

Question 2

Dual spool?

Answer 2

Referees to the compressor and turbine and shaft systems

Dual spool means to separate components

High pressure compressor and Turbine are connected separately to the low p C and T

Question 3

Fire protection

Answer 3

The nacelles are isolated by a firewall in the middle wing pylons connecting the wings

Also two additional fire walls around the engine

Question 4

N1 + N2

Answer 4

N1
- fan
- x4 comp
-X 5 low pressure turb

N2
- x12 height pressure comp
- x2 highl pressure turbine

Question 5

6th-9th comp stage

Answer 5

Variable stator vanes
Allow variable amounts of air through

SVA stator Vain Actuator System

Question 6

Combustion chamber

Answer 6

Singular annular burner
24 injections

Question 7

How is the engine inlet anti iced?

Answer 7

Re circled bleed air

Question 8

Advantages of an annular combustion

Answer 8

Uniform combustion
Better efficiency

Question 9

Which stage and engine provides OBIGSS

Answer 9

14th stage inboard engines

Question 10

Which states are responsible for bleed air

Answer 10

10-17th

Question 11

EEC

Answer 11

Electronic engine control
After N2 = 10%
It is Powered by PMA - permenant magnet alternator
Dual channel A+B
Also can be Powred by DC bus engine bus

Question 12

Loss of EEC

Answer 12

Degraded control state with slower accel and decel

Question 13

What are the ECC modes?

Answer 13

EPR normal
N1 alternate primary - still good
N2 alternate - cannot control settings of N1 no ATS no reverse thrust. Engine limit protection is not available N2 must be monitored

Question 14

Hung start

Answer 14

Engine normal combustion but does not accelerate to idle.

Airflow thought the system is insufficient

Could be caused by premature engine bleed

Question 15

Max thrust ambient temp OAT

Answer 15

31 deg cel 87 far
@ SL

Question 16

What does EGT margin give us?

Answer 16

EGT margin compares the EGT at max thrust compared with the 655 deg limit

655-645 = 10

This shows the current efficiency of the engine

When it decreases below 5 degrees it must be recored low EGT

Question 17

Engine Thrust Ratings

Answer 17

Maximum

Intermediate

Max continuous thrust

De- rated

Question 18

MAX

Answer 18

Limited to 5 mins for t/o
(10 for 3 engines)

T/o and GA

Question 19

INT

Answer 19

Max thrust certified for continuous use

Only used if MCT isn’t sufficient

Question 20

MCT

Answer 20

Max thrust used for normal climb operations. It is the max recommended power for four engine cruise

Question 21

DRT

Answer 21

Min MC thrust required to safely perform take off

Less than MAX and equal to or greater than MCT

DRT with EPR limit No
DRT with EPR limit yes
DRT CAT II

Question 22

When will Thrust Loss appear

Answer 22

When EPR of one engine is 0.15 less than the rest

Question 23

Hung start parameters

Answer 23

Measure N2 every 10 seconds if it does now increase 1%

Question 24

Sun idle hung start

Answer 24

Same as hung start but condition occurs for longer than 60 seconds after start button disengages

Question 25

Engine Oil tank volume

Answer 25

28 Quarts
5 unusable

On display

Min 4

Max 23

Question 26

Oil temp less than 50 deg

Answer 26

On t/o there will be a warning

Question 27

Where is Eng oil temp sensor?

Answer 27

Downstream of the filter

Question 28

2.5 and 14th Stage bleed on start?

Answer 28

To help prevent flame outs and surges

Question 29

Engine cooling

Answer 29

Fan duct bleed air to the high pressure compressor

Question 30

Fuel system

Answer 30

2 pumps

1 low pressure pump
- oil fuel heat Ex
- cools oil
- heats fuel

Fuel filter (with by pass valve)

2nd high pressure pump

Fuel control uni (FCU)

Question 31

Master caution / fuel filter captions

Answer 31

Comes on when pressure across the filter reacher 5psi

Question 32

Shut of valves

Answer 32

4 . One for each engine
Stops fuel at the FCU

Opening the valve also energies the engine ignition if selector at A or B

Question 33

Ignition A and B power supply

Answer 33

A from the AC Emergancy BUS
B from the AC bus 1,2,3,4 (from the engines)

Question 34

NORM/ORIDE

Answer 34

Located next to the ignition selector

Normal enables rotary ignition system. The ignition switch

ORIDE activities two over ride relays and and energises both A & B ignition systems on all 4.l engines and arms all 4 engine start buttons

Relay 1 power A for Eng 1,2 and B for 3,4

Relay 2 powers the opposite

Question 35

Amber light on starter button

Answer 35

Indicated starter valve opens
Allows pneumatic pressure to rotate the Eng starter
Stays in until N2 52%

Question 36

No.2 eng lightabove starter button?

Answer 36

Illuminates if there is a fire or if the fire handle has been pulled stays illuminated until the fuel shut of valve for the associated engine is turned

Question 37

Reverse thrust operation

Answer 37

Blocker doors on both the fan duct and core duct

Move air out the top of the engine

Each system is operated by its own engine hydraulics

Question 38

Thrust revers use in the air and on the ground? Slats?

Answer 38

Slats must be stowed in air and on the ground unless rejected takeoff or Landing

Question 39

UNLK yellow message on MFD

Answer 39

Thrust reverse has started to deploy

When fully deployed will change to cyan and will read REV

Question 40

MX THR TIME over/ rem

Answer 40

Over yellow counts up to 15mins

Green REM counts down from 5

Question 41

FF PPH if it goes blank?

Answer 41

Fuel flow pounds per hour

Any of the four meters are inoperative