T-56 Engine

Question 1

Maximum residual TIT for ground and inflight?

Answer 1

Ground start- 200 degrees Celsius

Inflight- 150 degrees Celsius

Question 2

When should a start be discontinued?

Answer 2

When TIT reaches 850 degrees Celsius

Question 3

What type of turbine does the T-56 have?

Answer 3

Impact reaction

Question 4

What is the RPM and TIT for max reverse?

Answer 4

RPM: 96.7-104.9

TIT: 580-790 degrees Celsius

Question 5

What is the RPM and TIT for low RPM?

Answer 5

RPM: 71.0-73.8

TIT: 410-730 degrees Celsius

Question 6

What is the RPM and TIT for normal RPM?

Answer 6

RPM: 96.3-99.1

TIT: 445-645 degrees Celsius

Question 7

What is the RPM and TIT for flight idle?

Answer 7

RPM: 94.5-98.4

TIT: 430-705 degrees Celsius

Question 8

What accessories are mounted on the accessory drive?

Answer 8

F uel control
E ngine fuel pump
S peed sensor valve
S peed sensor control
M ain oil pump
O il filter 
S cavenge oil pump

Question 9

When will the oil pressure light illuminate?

Answer 9

RGB oil pressure: 130 psi and below

Power section pressure: 40 psi and below

Question 10

What does the power section spin at?

Answer 10

13,820 RPM

Question 11

What is the capacity of the engine oil system?

Answer 11

Usable oil: 8.65 Gal

Unusable oil: 1.4 Gal

Foaming space: 5.7 Gal

Total oil: 15.75 Gal

Question 12

What is maximum TIT in low RPM limited to?

Answer 12

730 degrees Celsius

Question 13

What is oil temp under normal conditions?

Answer 13

60-90 degrees Celsius

Question 14

During a start when is maintenance action required?

Answer 14

When TIT exceeds 965 degrees Celsius

Question 15

What is the 14th stage bleed air used for?

Answer 15

W ing de-ice
E ngine anti-ice
E ngine start
B omb bay heating 
O il cool augmentation 
C lose 5th and 10th stage bleed valve

Question 16

What is the highest point of pressure in the compressor section?

Answer 16

Diffuser section

Question 17

What are the major sections of the engine?

Answer 17

P ower section
P ropulsion system
C ombustion section
C ompressor section
T urbine section

Question 18

How many oil pumps does the power section have?

What are they?

Answer 18

3

Scavenge oil pump
External scavenge oil pump
Turbine rear scavenge oil pump

Question 19

How is the oil tank shut-off valve closed by the E-Handle?

Answer 19

Pulled

Question 20

When does the oil hit light illuminate?

Answer 20

100 degrees Celsius

Question 21

What items are mounted on the reduction gear box (RGB)?

Answer 21

S tarter
T ac Generator 
O il pump/oil filter
G enerator (on 2,3,4)
E ngine driven compressor (EDC) 
"on 2,3"

Question 22

What percent of air is used for combustion?

Answer 22

25%

Question 23

What percent of air is used for turbine cooling?

Answer 23

75%

Question 24

What is the oil pressure of the P/S (power section) at normal and low?

Answer 24

Normal: 50-60 PSI

Low: 50-250 PSI

Question 25

What is RGB (Reduction Gear Box) oil pressure at normal and low?

Answer 25

Normal: 150-250 PSI

Low: 50-250 PSI

Question 26

What are the oil pressure fluctuation limits for power section and reduction gear box?

Answer 26

Power section: +/- 5

Reduction gear box: +/- 20

Question 27

How many can liners are there?

Answer 27

6

Question 28

How many thermal couples are there?

Answer 28

18