15.21 Operation and Monitoring

Question 1

What position must the thrust reverser lever be in before they can be deployed?

Answer 1

Idle

Question 2

What 3 parameters are monitored to prevent an engine hot or hung start?

Answer 2

Engine speed indicator, oil pressure and EGT

Question 2

What type of fire extinguisher must be available during an engine run-up?

Answer 2

CO2

Question 2

Do you want the aircraft positioned into or away from the wind during an engine run-up?

Answer 2

Into

Question 3

When carrying out acceleration checks on aircraft engines, what engine must be used as the datum?

Answer 3

Oldest engine

Question 3

What is switched of when an engine reaches idle?

Answer 3

Start and ignition

Question 3

When is the attendance of fire service required during an engine run-up?

Answer 3

If cowlings open or carrying out a pressure engine run

Question 3

Why is there an engine cooldown period after an idle or high power run?

Answer 3

Prevent possible seizure of rotors

Question 4

What is the cool-down period when an engine has been operated at idle or high power?

Answer 4

5 mins at idle

Question 5

What is data recording on aircraft performed by?

Answer 5

ACMS (aircraft condition monitoring system

Question 6

What additional data recording computer is required if the engine has hydro mechanical fuel controls?

Answer 6

PMUX (power plant data multiplexer)

Question 7

What is the function of the DMU (data management unit)?

Answer 7

Records data and compiles the ACMS reports to send to ground via datalink

Question 8

What are the 3 types of ACMS reports used?

Answer 8

Routine, on request and advisory

Question 9

How often are ACMS reports generated?

Answer 9

First 4 takeoffs then every 35 takeoffs

Question 10

What does SOAP stand for?

Answer 10

spectrometric oil analysis programme

Question 11

How do you separate ferrous from non ferrous particles?

Answer 11

Magnet

Question 12

If cast iron is present, what colour will it turn when nitric acid solution is added?

Answer 12

Dark brown

Question 13

If carbon steel is present, what colour will it turn when nitric acid solution is added?

Answer 13

Yellow or light brown

Question 14

If stainless steel is present, what colour will it turn when nitric acid solution is added?

Answer 14

Unaffected

Question 15

If bronze is present, what colour will it turn when nitric acid is added?

Answer 15

White powder

Question 16

If white metal is present, what colour will it turn when nitric acid is added?

Answer 16

Turn black and the nitric acid will turn pale green

Question 17

What are the 4 primary groups of magnetic particles?

Answer 17

Swarf, magnetic fines, metal flakes and chip

Question 18

Why do modern engines have vibration monitoring equipment fitted to monitor?

Answer 18

GTEs have low vibration levels so failure may go unnoticed

Question 19

Are cracks tolerated on a compressor blade?

Answer 19

No

Question 20

When can trailing edge damage of compressor vanes be blended?

Answer 20

If 1/3 weld seam remains after repair

Question 21

When is a wax marking pencil use?

Answer 21

On combustion section parts that are not directly exposed to gas path

Question 22

What method is used to inspect the combustion chamber for cracks?

Answer 22

Using visible dye or fluorescent penetrant inspection method

Question 23

What is a desalination wash?

Answer 23

Washing the engine with fresh water whilst running at idle.

Question 24

What is carried out when a desalination wash isn’t enough?

Answer 24

A performance recovery wash

Question 25

What is a performance recovery wash?

Answer 25

Spraying emulsion type surface cleaner into an engine running at idle

Question 26

How are fan blades sometimes cleaned?

Answer 26

Spraying coke into fan whilst rotating

Question 27

What treatment is used to harshly clean centrifugal compressor engines if fluid doesn’t work?

Answer 27

Injecting abrasive grit into the engine intake whilst running at idle

Question 28

What must be used as an antifreeze?

Answer 28

Isopropyl alcohol

Question 29

What does FOD stand for?

Answer 29

Foreign object damage