Powerplant

Question 1

What are the positions on the PCL?

Answer 1

OFF, IDLE, FLY, LOCKOUT

Question 2

What does HMU stand for?

Answer 2

Hydromechanical Unit

Question 3

What section of the engine mechanically drives RPM R?

Answer 3

Np section

Question 4

How is the Ng section connected to Np?

Answer 4

By (expanding, burning) gasses. (Not mechanically)

Question 5

What is the connection between Np and RPM R?

Answer 5

One-way mechanical connection, via the free-wheeling unit

Question 6

Name the four modules of the T700-GE-701D/CC engine

Answer 6

COLD, HOT, power turbine, accessory gear box

Question 7

What drives the accessory gear box?

Answer 7

Gas generator (Ng, at variable speed)

Question 8

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

Answer 8

6: 5 axial, 1 centrifugal

Question 9

What are the two operational sections of the engine?

Answer 9

Ng and Np

Question 10

How does the engine oil cooling occur?

Answer 10

Liquid to Liquid cooler and oil flow through scroll vanes.

Question 11

What is the service capacity for the engine oil?

Answer 11

7 quarts

Question 12

Where is the oil drawn from for the emergency oil system?

Answer 12

Sumps A and B

Question 13

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

Answer 13

Oil filter bypass valve, liquid to liquid cooler bypass valve.

Question 14

Which component provides electrical power to the engine?

Answer 14

Engine alternator

Question 15

How does the cockpit receive the Ng signal?

Answer 15

From the Ng winding of the alternator

Question 16

What happens if Ng signal is lost?

Answer 16

ENG OUT warning light and audio 0% Ng read out on the PDU

Question 17

Why does the fuel system operate on negative pressure?

Answer 17

It lessens the potential of fire in case of fuel system damage, by assuring that the airframe fuel supply system is under negative pressure.

Question 18

What happens when the fuel filter clogs?

Answer 18

Bypass indicator pops out, and the bypass valve opens.

Question 19

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

Answer 19

The LDS (Load Demand system) increases/decreases fuel flow

Question 20

How is engine power adjusted with the ENG POWER CONT levers in lockout?

Answer 20

Adjustment of the EPCLs adjusts the PAS (Power Available Spindle) to set the maximum power available.

Question 21

What is LDS an acronym for?

Answer 21

Load Demand System

Question 22

What is DEC an acronym for?

Answer 22

Digital Electronic Control

Question 23

Is the APU capable of starting both engines simultaneously?

Answer 23

Yes, with certain ambient temperature ranges. (Not recommended)

Question 24

At what Ng should the starter caution disappear?

Answer 24

52-65% Ng

Question 25

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

Answer 25

≥ 90%

Question 26

How do you normally disengage the starter?

Answer 26

Pull down on the EPCL to disengage starter.

Question 27

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

Answer 27

Yes, it is also supplied from the AC airframe power

Question 28

What does the HSP automatically prevent?

Answer 28

Over-temperature during engine starts by shutting down the engine.

Question 29

What system keeps the engines at an approximate equal torque?

Answer 29

Torque matching/load sharing system

Question 30

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

Answer 30

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

Question 31

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

Answer 31

4 to 13 degrees Celcius may or may not activate above 4 degrees it must activate

Question 32

701D/CC with engine anti-ice activated, how much should maximum %TRQ available be reduced?

Answer 32

18%, with cockpit gunner heater on reduce further 4%

Question 33

What is the purpose of the HIRSS system?

Answer 33

To reduce line of sight heat signature of the hot engine surfaces.

Question 34

How do you recognize an engine compressor stall?

Answer 34

Noticeable bang or popping noise and possible helicopter yaw.

Question 35

How many SHP does the T700-GE-701D/CC Engine produce?

Answer 35

1760

Question 36

What are the functions of the HMU?

Answer 36

- Controls fuel to the combustion section - Contains a high pressure valve that delivers fuel to the Overspeed and Drain Valve (ODV)

Question 37

The load demand system supplies what?

Answer 37

A mechanical and electrical signal to the load demand spindle on the engine HMU fuel control through a push pull control.