15.21, 15.14, 15.20

Question 1

What’s a hot start and give 3 causes

Answer 1

When EGT rise above allowable limit
Compressor stall
Low starter air pressure
FOD

Question 2

What’s a hung start and give 3 causes

Answer 2

When engine lights up but speed doesn’t increase
Low starter air pressure
FOD
Faulty starter valve

Question 3

SOAP

Answer 3

spectrometric oil analysis program is a method to check engine status , sample of oil is taken and analysed

Question 4

Which parameters are monitored on an engine for trend monitoring purposes

Answer 4

N1 , N2 , EGT , fuel flow

Question 5

Describe a monitoring wash
RPM
PSI

Answer 5

15-25% RPM

20-50psi

Question 6

Describe a running wash
RPM
PSI

Answer 6

60% RPM

15-25 psi

Question 7

What’s runway made of

Answer 7

Concrete

Question 8

Decibels of sound from engine test

Answer 8

140db

Question 9

Appropriate distance from inlet

Answer 9

Nobody within 20m

Question 10

Temperature of a hot wash for engine gas path washing

Answer 10

60-90 degrees

Question 11

Anti freeze mixtures …. 5 to -5 degrees

Answer 11

25% isopropyl, 75% water

Question 12

Anti freeze mixtures …. -5 to -10 degrees ?

Answer 12

35% isopropyl 65% water

Question 13

When should you not wash engine gas path

Answer 13

Below -10 degrees

Question 14

What’s used to measure EGT for purpose of temp indication

Answer 14

Thermocouples

Question 15

What’s EPR and what does it measure

Answer 15

Engine pressure ration

It measures turbine discharge pressure / intake pressure

Question 16

Sensors used to measure speed

Answer 16

Tachometer generator ( older aircraft )
Magnetic pickup ( phonic wheel )

Question 17

What is it when engine is measured for performance

Answer 17

Condition monitoring

Question 18

Secondary engine indications

Answer 18

Oil pressure , oil temp , fuel pressure , fuel temp , oil quantity

Question 19

What metal is EGT probes

Answer 19

Chrome lane Alumel
Chromel= white
Alumel= green

Question 20

Where is EPR normally measured

Answer 20

Pt2 probe from intake bullet

Pt7 probe in manifold aft of turbine final stage

Question 21

Sensors used to measure oil temp

Answer 21

Most common is the resistance bulb

It’s made of pure nickel

Question 22

How are engine oil contents measured

Answer 22

Reed switch transmitter

Variable capacitance transmitter

Question 23

How is fuel temp measured

Answer 23

Measured by a temp bulb

Question 24

How is fuel pump tank pressure monitored

Answer 24

A simple pressure switch

Question 25

How is fuel flow monitored

Answer 25

The synchronous mass flow meter | The motor less mass flow meter

Question 26

2 methods used to monitor engine speed on N1 and N2

Answer 26

``` N1= magnetic pickup ( phonic disk ) N2= tachometer generator ```

Question 27

2 devices used to monitor engine vibration

Answer 27

Sprung magnet type ( older engines ) | Piezoelectric type

Question 28

How is power of engine expressed

Answer 28

Turbo prop= RPM | Gas turbine= EPR

Question 29

Fire protection system consists of what systems

Answer 29

Detector circuit , alarm circuit , test circuit

Question 30

Fire bottle made from?

Answer 30

Steel

Question 31

Why are C02 bottles charged with nitrogen

Answer 31

To provide pressure to complete discharge of agent

Question 32

Indication given in event of fire

Answer 32

Bell and fire warning light

Question 33

What type of detectors are fenwal

Answer 33

Continuous loop detectors

Question 34

Describe a Walter kidde fire detector

Answer 34

Continuous loop detector with 2 conducting cores

Question 35

Systron donner?

Answer 35

A pneumatic fire loop ( filled with helium )