Engine System (CSG)

Question 1

What does “Free Turbine” mean?

Answer 1

AOH Vol 2, Engine

Question 2

The PT6A-67B is flat rated to 1,200 SHP at takeoff power. What does “flat rated” mean?

Answer 2

2. Max SHP/Engine limits reduced to prevent structural damage, extend engine life, and permit max takeoff power over wide range of ambient conditions.

Pratt and Whitney “Know your PT-6A
Turboprop” Handbook

Question 3

All PT6A engine applications use ________________ as the primary power setting parameter.

Answer 3

Torque

Pratt and Whitney “Know your PT-6A
Turboprop” Handbook

Question 4

The PT6A-67B combustion section uses _______ duplex fuel nozzles and ____
spark ignitors.

Answer 4

14, 2

AOH Vol 2, Engine

Question 5

What components are installed in the accessory gearbox?

Answer 5

Starter/Generator, FCU, High/Low press fuel pumps, fuel/oil heat exchanger, Oil scavenge and pressure pumps

AOH Vol 2, Engine

Question 6

The engine uses approximately 25% of bleed air for combustion. Name at least five other uses for bleed air.

Answer 6

ECS, Pressurization, De-ice boots, FCU, Cooling, Bleed Valve, Sealing bearing compartment

AOH Vol 2, Engine, ECS, Ice
Protection

Question 7

What does the compressor bleed valve do?

Answer 7

Prevents compressor stalls during engine acceleration from low engine speeds.

Pratt and Whitney “Know your PT6A
Turboprop” Handbook

Question 8

What does the reduction gearbox do?

Answer 8

Reduces turbine speed from ~30,000 RPM to prop shaft speed of 1700 RPM (or less) through two stages of gear reduction

AOH Vol 2, Engine and Pilatus
Engineering Notes

Question 9

What does the torque limiter do?

Answer 9

Bleeds Py air from FCU to reduce engine speed and keep engine torque below 44.3 psi

AOH Vol 2, Engine

Question 10

(T/F) the EIS must be operational for all flights.

Answer 10

True

AOH Vol 1, EIS Failure checklist

Question 11

What does the MENU button do on the EIS?

Answer 11

Alternate display of Torque and ITT in Endurance and OAT
windows

AOH Vol 2, EIS

Question 12

(T/F) The EIS automatically records ops limit exceedance.

Answer 12

True

AOH Vol 2, EIS

Question 13

13. Ops limits
    a. Max Continuous Torque _______
    b. Max Continuous ITT_______
    c. Max Starting ITT and duration _______ _______
    d. Max Ng _______
    e. Max Continuous Prop RPM _
    f. Prohibited RPM range on ground _____________
    g. Normal Oil Pressure_
    h. Low Oil Press Caution Range (Amber) _______
    i. Low Oil Press Warning (Red) _______
    j. Max Continuous Oil Temp Range ___________
    k. Oil Temp Warning ___________

Answer 13

a. 36.9 psi,
b. 760°C,
c. 1000°C/5 sec,
d. 104%,
e. 1700 (+/-30) RPM,
f. 350-950 RPM,
g. 90-135 psi,
h. 40-60/60-90 psi,
i. <40 psi (40-90 psi after 20 sec delay),
j. 10-105°C,
k. >110°C

AOH Vol 1, Chapter 5

Question 14

13. Ops limits
    a. Max Continuous Torque _______

Answer 14

a. 36.9 psi,

AOH Vol 1, Chapter 5

Question 15

13. Ops limits
    b. Max Continuous ITT_______

Answer 15

b. 760°C 67B,820 67P

AOH Vol 1, Chapter 5

Question 16

13. Ops limits
    c. Max Starting ITT and duration _______ _______

Answer 16

c. 1000°C/5 sec,

AOH Vol 1, Chapter 5

Question 17

13. Ops limits
    d. Max Ng _______

Answer 17

d. 104%,

AOH Vol 1, Chapter 5

Question 18

13. Ops limits
    e. Max Continuous Prop RPM _

Answer 18

e. 1700 (+/-30) RPM,

AOH Vol 1, Chapter 5

Question 19

13. Ops limits
    f. Prohibited RPM range on ground _____________

Answer 19

f. 350-950 RPM,

AOH Vol 1, Chapter 5

Question 20

13. Ops limits
    g. Normal Oil Pressure___

Answer 20

g. 90-135 psi

AOH Vol 1, Chapter 5

Question 21

13. Ops limits
    h. Low Oil Press Caution Range (Amber) _______

Answer 21

h. 40-60 psi
or
If Ng above 72%, 60-90 psi after a 5 sec. delay

AOH Vol 1, Chapter 5

Question 22

13. Ops limits
    i. Low Oil Press Warning (Red) _______

Answer 22

i. <40 psi (40-90 psi after 20 sec delay)

AOH Vol 1, Chapter 5

Question 23

13. Ops limits
    j. Max Continuous Oil Temp Range ___________

Answer 23

j. 10-105°C,

AOH Vol 1, Chapter 5

Question 24

13. Ops limits
    k. Oil Temp Warning ___________

Answer 24

k. >110°C

AOH Vol 1, Chapter 5

Question 25

When is the MOR lever used?

Answer 25

Pneumatic failure at FCU or PCL system failure ## Footnote AOH Vol 2, Engine

Question 26

During MOR lever operations, maintain Ng normally above ______ and do not let Ng fall below ______.

Answer 26

80%, 65% (75% EQ+) ## Footnote AOH Vol 1, Chapter 3

Question 27

How much could total landing distance increase when using the MOR lever?

Answer 27

By a factor of two (2) ## Footnote AOH Vol 1, Chapter 3

Question 28

What does the P3 Accumulator do?

Answer 28

Stores bleed air used to purge fuel nozzles during engine shutdown ## Footnote AOH Vol 2, Engine

Question 29

What battery voltage is required for engine start?

Answer 29

24 Volts ## Footnote AOH Vol 1, Normal Procedures

Question 30

If the oil temperature is < +5° C, place condition lever to ____________ for engine start.

Answer 30

Flight Idle ## Footnote AOH Vol 1, Normal Procedures

Question 31

When is the STARTER INTERRUPT button used?

Answer 31

Interrupt start by deactivating starter relay during a starting malfunction ## Footnote AOH Vol 2, Engine

Question 32

What are the starter cycle limits?

Answer 32

Sequence, 60 sec OFF, Sequence, 60 sec OFF, Sequence, 30 min OFF ## Footnote AOH Vol 1, Chapter 5

Question 33

What is a hung start?

Answer 33

ITT rise, but Ng does not increase to idle speed ## Footnote AOH Vol 1, Chapter 3

Question 34

When is the DRY MOTORING RUN checklist used?

Answer 34

To remove internally trapped fuel and vapor or if there is evidence of a fire within the engine gas path ## Footnote AOH Vol 1, Chapter 3

Question 35

What should you do if there is no indication of increase in Ng or ITT within 10 sec of placing the condition lever to GROUND IDLE?

Answer 35

NO START: Condition Lever…CUT-OFF/FEATHER, Starter…Interrupt ## Footnote AOH Vol 1, Chapter 3

Question 36

What is done with the starter during a HOT START?

Answer 36

Continue ON for 20 seconds ## Footnote AOH Vol 1, Chapter 3

Question 37

For off-station operations, check the oil quantity using the sight gauge within ______ to ______ minutes after engine shutdown.

Answer 37

10, 20 ## Footnote AOH Vol 1, Normal Procedures

Question 38

What quantity of oil is maintained in the engine oil system?

Answer 38

14.5 quarts ## Footnote AOH Vol 2, Engine

Question 39

When does the red OIL QTY warning illuminate on the CAWS panel and what does it mean?

Answer 39

Only on ground before start or after engine shutdown; Oil quantity indicates low ## Footnote AOH Vol 1, Chapter 3

Question 40

What is the first step in the emergency checklist for OIL TEMPERATURE caution or warning?

Answer 40

PCL…Reduce Power ## Footnote AOH Vol 1, Chapter 3

Question 41

For an OIL PRESSURE CAUTION, reduce torque below _______ PSI.

Answer 41

24 ## Footnote AOH Vol 1, Chapter 3

Question 42

What is the procedure for an OIL CHIP CAWS in flight?

Answer 42

Check engine parameters, reduce power to minimum required for safe flight, land as soon as possible ## Footnote AOH Vol 1, Chapter 3, Oil Contamination

Question 43

(T/F) Flight with a CAWS FIRE DETECT is OK as long as the ENG FIRE warning test is good.

Answer 43

False ## Footnote AOH Vol 1, Chapter 3

Question 44

Following an engine failure in flight, when would you not attempt an air start?

Answer 44

If engine failure is due to Fire, FOD, Seizure, or no fuel remains ## Footnote AOH Vol 1, Chapter 3, Warning