Systems

Question 1

The T-6B Engine is…

Answer 1

PT6A-68 Free turbine turboprop engine

Question 2

The T-6B Engine can produce ____ SHP

Answer 2

1100

Question 3

The gas generator of the T-6B engine is composed of…

Answer 3

A four stage axial flow compressor
A single stage centrifugal flow compressor (impeller)
Combustion chamber
Single stage compressor turbine

Question 4

The power turbine of the T-6B engine is a ____ stage power turbine which drives the ____.

Answer 4

two, RGB

Question 5

Oil system capacity

Answer 5

18.5 quarts

Question 6

Primary function of the oil system

Answer 6

Constant supply of filtered oil to bearings, reduction gears, accessory drives, and propeller

Question 7

4 components of the oil system

Answer 7

1. Pressure
2. Scavenge
3. Cooler
4. Breather

Question 8

What does the pressure component of the oil system do?

Answer 8

Picks up oil from the tank

Question 9

What does the scavenge component of the oil system do?

Answer 9

Two pumps return scavenged oil from bearings and gear box

Question 10

How is oil cooled?

Answer 10

Scavenged oil is routed through an air cooler in the lower aft cowl assembly before returning to the tank.

Question 11

What does the breather component of the oil system do?

Answer 11

Breather component maintains oil pressure in the oil tank via a breather valve and a centrifugal breather.

Question 12

Oil px and temp are sensed by ______ located _______ of the main pump and the signal is sent to the _______.

Answer 12

Transducers, downstream, EDM

Question 13

EDM and function

Answer 13

Engine Data Manager monitors engine operating parameters and illuminates the appropriate EICAS display when necessary.

Question 14

SCU and its function

Answer 14

Signal Conditioning Unit. Provides oil indications to the EICAS and engine indications. Very sensitive

Question 15

Red OIL PX

Answer 15

Oil px IDLE OR <15psi @IDLE

Question 16

Amber OIL PX

Answer 16

Oil px 40-90psi (10sec) >IDLE OR 15-40psi @IDLE

Question 17

Both Red & Amber OIL PX

Answer 17

15-40 @IDLE for 5sec or more

Question 18

Red CHIP

Answer 18

Indicates oil contamination by ferrous material

Question 19

Reduction gear box converts power turbine shaft speed (_____ RPM) to prop shaft speed (_____ RPM)

Answer 19

30,000-2,000

Question 20

Np

Answer 20

Prop speed

Question 21

PMU

Answer 21

Power management unit

Question 22

PIU

Answer 22

Prop Interface Unit

Question 23

PROP SYS Circuit Breaker is located… and powers the…

Answer 23

Located on the battery bus in the front cockpit.

Powers the feather dump solenoid.

Question 24

FMU

Answer 24

Fuel Management Unit

Question 25

PMA Location? Powers? With how much Voltage?

Answer 25

Permanent magnet alternator Mounted on RGB Powers PMU with 32 VAC