Engines and Related Systems

Question 1

How many sections is the engine divided into?

Answer 1

4
Hot
Cold
Accessory
Power Turbine

Question 2

What is included in the cold section?

Answer 2

Inlet particle separator, the compressor, the output shaft and line replaceable units

Question 3

How many stages does the compressor have?

Answer 3

6, 5 axial and 1 centrifugal

Question 4

How many subassemblies are there in the hot section?

Answer 4

3
Gas generator turbine
Stage 1 nozzle assembly
Combustion liner

Question 5

What sections does the power turbine have?

Answer 5

Two stage power turbine, exhaust frame, shaft and C sump assembly

Question 6

What does the accessory section include?

Answer 6

accessory gear box, HMU, engine driven boost pump, oil filter, oil cooler, oil pressure sensor, fuel pressure sensor

Question 7

What makes up the engine fuel system supply?

Answer 7

boost pump, fuel filter, fuel filter bypass, fuel pressure sensor, ODV

Question 8

What are the two mechanical inputs from the cockpit to the HMU?

Answer 8

Load demand spindle and Power available spindle

Question 9

What does the load demand spindle do?

Answer 9

Provides mechanical input from the collective output to the HMU to reduce transient engine and NR droop.

Question 10

What does the sheer pin/roll pin in the LDS provide?

Answer 10

It prevents flight control jam in the event of a load demand malfunction. The pin will sheer causing the LDS to the HMU to drive fully aft and produce the most demand, may present as a torque split

Question 11

What operates the Power Available Spindle in the HUM?

Answer 11

The engine power control levers

Question 12

What does the ODV do?

Answer 12

Sends fuel to the fuel manifold for starting, acceleration, and engine operations.

It purges fuel

It will shut of fuel flow to prevent engine overspeed and hot starts

Question 13

What does the engine alternator supply?

Answer 13

AC power to the ignition excited, DEC/EDECU, NG signal to the cockpit

Question 14

What do the two bleed airports provide?

Answer 14

Cabin heating and air for crossbleed starts

Question 15

What do the 2 sensors on the exhaust frame provide?

Answer 15

Power turbine governor and tachometer signal to DEC/EDEC

Question 16

What does appearance of the INLET ANTI ICE advisory indicate above 13*C?

Answer 16

indicates a system malfunction

Question 17

What does the failure of the INLET ANTI ICE advisory below 4*C indicate?

Answer 17

System malfunction, do not fly the aircraft in known icing

Question 18

Due to engine bleed limits, what Q levels will inhibit inlet anti icing?

Answer 18

10% Q

Question 19

When will you see the ENG 1 OIL PRESS or ENG 2 OIL PRESS caution?

Answer 19

22 PSI or below

Question 20

What is the capacity of the oil tank?

Answer 20

7 qts

Question 21

How is oil cooled?

Answer 21

It passes through the oil cooler and transfers its heat to fuel. It then passes through scroll vanes, further cooling the oil and preparing the anti-ice system

Question 22

What are the 3 pneumatic sources for engine starts?

Answer 22

APU, crossbleed, ground source

Question 23

When should the engine starter on caution disappear?

Answer 23

Cutoff speed of 52-65% NG

Question 24

When will fuel flow automatically shut off?

Answer 24

If TGT reaches 900*C

Question 25

Can you start the engine with the ignition off?

Answer 25

No, but you can motor it

Question 26

What bias does the DEC incorporate?

Answer 26

-112*C

Question 27

What signals does the DEC provide to the cockpit?

Answer 27

NP1/NP2, Q, TGT

Question 28

What does hot start prevention do?

Answer 28

Prevents over temp during engine start or shut down

Question 29

When does HSP activate?

Answer 29

When NG < 60%, NP < 50%, TGT>900*C

Question 30

When does the DEC command the HMU to limit fuel?

Answer 30

Dual engine: 10 minute, 879*C +/- 9 Single engine: 2.5 minute, 903 +/- 10

Question 31

When will the DEC switch to contingency power?

Answer 31

When the opposite Q is less than 50% (engine failure or torque split)

Question 32

When is the NP overspeed protection tripped?

Answer 32

NP 120% +/- 1

Question 33

How do you know you have an EDECU installed?

Answer 33

25 on the TQ code

Question 34

For an engine with an EDECU, when will you get contignecy power?

Answer 34

NP drops below 96% Greater than 3% droop between the reference and actual NP Greater than 5% per second NP droop rate

Question 35

When will NG display on the power pod?

Answer 35

Either engine NG exceeds 100% Difference between NG 1 and NG 2 is 5% Either engine is out

Question 36

When does TGT display on the power pod?

Answer 36

Either engine exceeds 793C Difference between TGT 1 and TGT 2 is greater than 75C Either engine is out

Question 37

What happens when the DCU miscompares?

Answer 37

The parameter that has miscompared will turn black with a yellow background