72 Powerplant

Question 1

How is fuel injected into the combustion chamber liner?

Answer 1

14 simplex nozzles consisting of primary and secondary transfer tubes.

Question 2

What happens to the direction of the air as it enters the combustion liners?

Answer 2

changes direction 180 degree’s

Question 3

What is the purpose of the stator vanes located between each stage of compression.

Answer 3

Diffuses the air, raises its static pressure and directs it to the. next stage.

Question 4

The engine utilizes 2 independent turbine sections what are they?

Answer 4

One drives the compressor in the gas generator section, the second (two stage power turbine) driving the prop shaft.

Question 5

What is contained inside the RGB?

Answer 5

two-stage planetary gear-train, accessory drives, torque-meter and prop shaft.

Question 6

Where is the RGB located on the engine?

Answer 6

Front of the engine consisting of 2 allow housings bolted together at Flange A

Question 7

1st stage ring gear, is allowed to move axially for what purpose?

Answer 7

Torquemeter application.

Question 8

How are the 2 stages of planetary gears connected?

Answer 8

Flexible coupling which acts to dampen any vibrations.

Question 9

What is the second stage carrier splined together with?

Answer 9

The prop shaft, a flanged roller bearing supports the 2 units (prop shaft and second stage carrier)

Question 10

How are hydraulic locks prevented for the torquemeter chamber?

Answer 10

Continuous bleed of oil through the small bleed orifice at the top of the torque-meter cylinder.

Question 11

What is housed inside the inlet case.

Answer 11

No.1 Bearing, oil level guage.

Question 12

Where is P2.5 air taken from for airframe services?

Answer 12

12 oclock position on the gas generator cas.

Question 13

Where is P3 air taken from?

Answer 13

9 oclock position between the engine mounts.

Question 14

Torque from the power turbine section is transmitted through the power turbine shaft and turbine coupling to

Answer 14

the first-stage sun gear.

Question 15

The first-stage of the reduction geartrain consists of

Answer 15

three planet gear assemblies in a rotating carrier balancing assembly and a non
rotating ring gear.

Question 16

The second-stage sun gear drives

Answer 16

five planet gears mounted in the second-stage carrier.

Question 17

The accessories located on the front housing are driven by

Answer 17

a bevel drive gear mounted at the rear of the propeller shaft thrust bearing
assembly.

Question 18

Propeller thrust loads are absorbed by

Answer 18

the ball bearing assembly, located on the front section of the propeller shaft.

Question 19

What flanges are incorporated for your compressor inlet case? on?

Answer 19

Flange F (fwd, gas gen case) Flange G(aft, agb)

Question 20

Housed in the inlet case is the

Answer 20

No. 1 bearing assembly with its associated rotor and stator seals and the No. 1 bearing oil jet.

Question 21

The center fireseal mount ring, which forms a bulkhead between the

Answer 21

compressor air inlet zone and the front of the engine

Question 22

The rear fireseal mount ring, which forms a bulkhead between the

Answer 22

compressor air inlet zone and the accessory gearbox

Question 23

A bleed air adapter, located at the 12 o’clock position on the case, provides

Answer 23

P2.5 air for

airframe services.

Question 24

P3 airframe air is provided by an adapter located at the

Answer 24

9 o’clock position between the main engine mounts

Question 25

The compressor rotor is supported on a

Answer 25

No. 1 ball bearing and a No. 2 roller bearing assembly.