Engine System (CSG) Flashcards
What does “Free Turbine” mean?
AOH Vol 2, Engine
The PT6A-67B is flat rated to 1,200 SHP at takeoff power. What does “flat rated” mean?
- 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
All PT6A engine applications use ________________ as the primary power
setting parameter.
Torque
Pratt and Whitney “Know your PT-6A
Turboprop” Handbook
The PT6A-67B combustion section uses _______ duplex fuel nozzles and ____
spark ignitors.
14, 2
AOH Vol 2, Engine
What components are installed in the accessory gearbox?
Starter/Generator, FCU, High/Low press fuel pumps, fuel/oil heat exchanger, Oil scavenge and pressure pumps
AOH Vol 2, Engine
The engine uses approximately 25% of bleed air for combustion. Name at least five other uses for bleed air.
ECS, Pressurization, De-ice boots, FCU, Cooling, Bleed Valve, Sealing bearing compartment
AOH Vol 2, Engine, ECS, Ice
Protection
What does the compressor bleed valve do?
Prevents compressor stalls during engine acceleration from low engine speeds.
Pratt and Whitney “Know your PT6A
Turboprop” Handbook
What does the reduction gearbox do?
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
What does the torque limiter do?
Bleeds Py air from FCU to reduce engine speed and keep engine torque below 44.3 psi
AOH Vol 2, Engine
(T/F) the EIS must be operational for all flights.
True
AOH Vol 1, EIS Failure checklist
What does the MENU button do on the EIS?
Alternate display of Torque and ITT in Endurance and OAT
windows
AOH Vol 2, EIS
(T/F) The EIS automatically records ops limit exceedance.
True
AOH Vol 2, EIS
- 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 ___________
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
- Ops limits
a. Max Continuous Torque _______
a. 36.9 psi,
AOH Vol 1, Chapter 5
- Ops limits
b. Max Continuous ITT_______
b. 760°C,
AOH Vol 1, Chapter 5
- Ops limits
c. Max Starting ITT and duration _______ _______
c. 1000°C/5 sec,
AOH Vol 1, Chapter 5
- Ops limits
d. Max Ng _______
d. 104%,
AOH Vol 1, Chapter 5
- Ops limits
e. Max Continuous Prop RPM _
e. 1700 (+/-30) RPM,
AOH Vol 1, Chapter 5
- Ops limits
f. Prohibited RPM range on ground _____________
f. 350-950 RPM,
AOH Vol 1, Chapter 5
- Ops limits
g. Normal Oil Pressure___
g. 90-135 psi
AOH Vol 1, Chapter 5
- Ops limits
h. Low Oil Press Caution Range (Amber) _______
h. 40-60 psi
or
If Ng above 72%, 60-90 psi after a 5 sec. delay
AOH Vol 1, Chapter 5
- Ops limits
i. Low Oil Press Warning (Red) _______
i. <40 psi (40-90 psi after 20 sec delay)
AOH Vol 1, Chapter 5
- Ops limits
j. Max Continuous Oil Temp Range ___________
j. 10-105°C,
AOH Vol 1, Chapter 5
- Ops limits
k. Oil Temp Warning ___________
k. >110°C
AOH Vol 1, Chapter 5
When is the MOR lever used?
Pneumatic failure at FCU or PCL system failure
AOH Vol 2, Engine
During MOR lever operations, maintain Ng normally above ______ and do not let Ng fall below ______.
80%, 65% (75% EQ+)
AOH Vol 1, Chapter 3
How much could total landing distance increase when using the MOR lever?
By a factor of two (2)
AOH Vol 1, Chapter 3
What does the P3 Accumulator do?
Stores bleed air used to purge fuel nozzles during engine
shutdown
AOH Vol 2, Engine
What battery voltage is required for engine start?
24 Volts
AOH Vol 1, Normal Procedures
If the oil temperature is < +5° C, place condition lever to ____________ for engine start.
Flight Idle
AOH Vol 1, Normal Procedures
When is the STARTER INTERRUPT button used?
Interrupt start by deactivating starter relay during a starting malfunction
AOH Vol 2, Engine
What are the starter cycle limits?
Sequence, 60 sec OFF, Sequence, 60 sec OFF, Sequence, 30 min OFF
AOH Vol 1, Chapter 5
What is a hung start?
ITT rise, but Ng does not increase to idle speed
AOH Vol 1, Chapter 3
When is the DRY MOTORING RUN checklist used?
To remove internally trapped fuel and vapor or if there is evidence of a fire within the engine gas path
AOH Vol 1, Chapter 3
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?
NO START:
Condition Lever…CUT-OFF/FEATHER,
Starter…Interrupt
AOH Vol 1, Chapter 3
What is done with the starter during a HOT START?
Continue ON for 20 seconds
AOH Vol 1, Chapter 3
For off-station operations, check the oil quantity using the sight gauge within ______ to ______ minutes after engine shutdown.
10, 20
AOH Vol 1, Normal Procedures
What quantity of oil is maintained in the engine oil system?
14.5 quarts
AOH Vol 2, Engine
When does the red OIL QTY warning illuminate on the CAWS panel and what does it mean?
Only on ground before start or after engine shutdown; Oil quantity indicates low
AOH Vol 1, Chapter 3
What is the first step in the emergency checklist for OIL TEMPERATURE caution or warning?
PCL…Reduce Power
AOH Vol 1, Chapter 3
For an OIL PRESSURE CAUTION, reduce torque below _______ PSI.
24
AOH Vol 1, Chapter 3
What is the procedure for an OIL CHIP CAWS in flight?
Check engine parameters, reduce power to minimum required for safe flight, land as soon as possible
AOH Vol 1, Chapter 3, Oil
Contamination
(T/F) Flight with a CAWS FIRE DETECT is OK as long as the ENG FIRE warning test is good.
False
AOH Vol 1, Chapter 3
Following an engine failure in flight, when would you not attempt an air start?
If engine failure is due to Fire, FOD, Seizure, or no fuel remains
AOH Vol 1, Chapter 3, Warning
