Engines

Question 1

Name the four modules of the T700-GE-701D engine.

Answer 1

Cold, hot, power turbine, accessory gear box

Question 2

What drives the accessory gear box?

Answer 2

Gas Generator (at a variable speed)

Question 3

How many stages are there in the compressor section (NG)?

Answer 3

There are 6: 5 axial and 1 centrifugal

Question 4

What are the two operational sections of the engine?

Answer 4

NG and NP

Question 5

Where does the engine receive its electrical power?

Answer 5

Engine alternator.

Question 6

If NG signal is lost, what happens?

Answer 6

ENG OUT warning light and audio appear with 0% NG indicated.

Question 7

How does the cockpit receive the NG signal?

Answer 7

From the NG winding of the alternator.

Question 8

Why does the fuel system operate on negative pressure?

Answer 8

It assures that the airframe fuel supply system is under negative pressure, lessening the potential of fire in case of fuel system damage.

Question 9

What happens when the fuel filter clogs?

Answer 9

Bypass indicator pops out, bypass valve opens.

Question 10

How does the engine compensate for variable power demands from collective inputs?

Answer 10

The LDS increases/decreases fuel flow through the HMU.

Question 11

How is engine power adjusted with the PCLs in lockout?

Answer 11

Adjustment of the engine power control levers set the maximum power available to the HMU.

Question 12

How does engine oil cooling occur?

Answer 12

Liquid to liquid cooler, oil flow through the scroll vanes

Question 13

What is the service capacity for the engine oil?

Answer 13

7 quarts

Question 14

Where is the oil for the emergency oil system?

Answer 14

Sumps A and B

Question 15

How does the oil system overcome high pressure during cold starts?

Answer 15

Oil filter bypass valve.

Question 16

If alternator power is lost to the engine, will the DEC still remain functional?

Answer 16

Yes, it is supplied from the AC airframe power

Question 17

What does the HSP automatically prevent?

Answer 17

It prevents over temperature during engine starts by shutting down the engine

Question 18

What system keeps the engines at an approximate equal torque?

Answer 18

The torque matching/load sharing system.

Question 19

Is the APU capable of starting both engines simultaneously?

Answer 19

Yes, within certain ambient temperature ranges.

Question 20

At what NG should the starter caution disappear?

Answer 20

52-65% NG

Question 21

With one engine operating, what NG must be maintained to crossbleed start the other?

Answer 21

> 90%

Question 22

How do you manually disengage the starter?

Answer 22

You must pull down on the PCL to disengage the starter.

Question 23

Other than bleed air, what is used to assist in engine anti-ice functions?

Answer 23

The hot engine oil also provides a passive anti-ice function.

Question 24

The engine inlet anti-ice automatically activates between what temperature ranges?

Answer 24

4°C to 13°C it may or may not activate, <4°C it must activate

Question 25

With engine anti ice activated how much should maximum Q available be reduced?

Answer 25

-20%. With cockpit gunner heater on reduce another 5%

Question 26

What is the purpose of the upturned exhaust system?

Answer 26

To reduce the Infra-red signature of the engine exhaust.

Question 27

What may cause heat from the UES to damage the main rotor blades.

Answer 27

Rotor brake starts with the blades positioned over the UES.

Question 28

What should you do before responding to the ENG OUT warning and audio?

Answer 28

Do not respond to ENG OUT warning and audio until checking TGT, NG, and NP1 and NP2.

Question 29

How do you recognize an engine compressor stall?

Answer 29

A loud banging or popping accompanied by rapid increase in TGT and fluctuations in NG, Q, and NP