Engine, Fuel, Prop

Question 1

Mfg and Name of engine:
___ SHP but flat-rated at ___ SHP
___% of thrust from exhaust
Installed __ degrees L or R and __ degrees Up or Down

Answer 1

Pratt and WHitney, PT6A-67B
1600 SHP, flat 1200 SHP
6% of thrust by exhaust
2 degrees down and to the right

Question 2

Compressor section:
__ stage axial
__ stage ___ impeller
__ stator vane assemblies

Answer 2

4 stage axial
1 stage centrifugal impeller
4 stator vanes

Question 3

Turbine section has 2 types of turbines,
(A) ___ (which runs the __ and __) and
(B) ___ (which runs the __ and __)
The ___ reduces turbine speed (Nf) to a speed suitable for the prop

Answer 3

Compressor 
- compressor rotor 
- accessory gearbox (all except prop governors)
Power turbines
- Exhaust duct
- Reduction gearbox (reduces Nf)

Question 4

Torque (Q) indicator:
_ to _ is green
_ to _ is yellow
*T/O and Transient (Red) >/= \_\_
*Red diamond at \_\_
*\_\_\_ second time limit

Answer 4

Torque (Q) indicator:
0-37 is green
37.1 to 44.4 is yellow
*T/O and Transient (Red) >/= 44.4
*Red diamond at 61
* 20 second time limit

Question 5

Engine Start:

1. If no ITT rise w/in __ “ of cond lever to idle = __
2. If ___at fuel intro, __

Answer 5

If no rise w/in 10”, shut down and see checklist

If rapid ITT rise at fuel intro, shut down and see checklist

Question 6

ITT Indications
Green from \_\_ to \_\_
Yellow from \_\_ to \_\_
Red from \_\_ to \_\_
Red diamond at \_\_\_\_

Answer 6

Green from 400-760
Yellow from 760-800
Red from 800-1000
Red diamond at 1000

Question 7

Hung Start is when ___ stops increasing below ___.
Advance ___ to __ idle then back to __ once engine reaches min idle.
If not successful w/in ___ “ then shut down

Answer 7

Hung Start is when Nf stops increasing below Ground Idle (50.7%) or Flight Idle (64%).
Advance condition lever to flight idle then back to ground idle once engine reaches min idle.
If not successful w/in 10 “ then shut down

Question 8

Ng (Gas Generator Speed) indications.
% of ____ RPM (max compressor section)
Green from __ to __
Red line at ___

Answer 8

% of 37,468 RPM
Green from 60-104%
Red line at 104%

Question 9

Oil temps (degrees C)
Green arc from \_\_ to \_\_
Yellow from \_\_ to \_\_ (transient)
Red limit at \_\_\_
Best oil service life from \_\_ to \_\_ range

Answer 9

Green arc from 10-105
Yellow from 105-110 (transient)
Red limit at 110
Best oil service life from 60-70 degree range

Question 10

Oil Pressure (PSI)
Green from _ to _
Yellow from _ to _
Red at __ (upper limit of low pressure)
Red diamond at __ (min press + low transient limit) and __ (max pressure and transient)
Transient (__ to __) must not exceed __ “

Answer 10

Green from 90-135
Yellow from 60-90
Red at 60 (upper limit of low pressure)
Red diamond at 40 (min press + low transient limit) and 200 (max pressure + transient)
Transient (135-200) must not exceed 20”

Question 11

Oil Ops Limits:

1. Ops < __ PSI is undesirable, may continue from __ to __ when TRQ is ___ PSI Max
2. Ops < __ PSI is unsafe = land ASAP using min power
3. Capacity is ____ US Quarts

Answer 11

1. Ops < 90 PSI is undesirable, may continue from 60 to 90 PSI when TRQ is 23.9 PSI Max
2. Ops < 60 PSI is unsafe = land ASAP using min power
3. Capacity is 14.5 US Quarts

Question 12

Red EIS (Engine Instrument System) = ?
Amber = ?
Self-Detected error displays as? Do What?

Answer 12

Red = NO GO
Amber = Go, but MX req’d
Self Detect = dashes. Shutdown, press test to get code.

Question 13

Prohibited ground Np range is __ to __ RPM

Answer 13

Prohibited ground Np range is 350-950

Question 14

Primary role of

1. Condition Lever:
2. PCL:

Answer 14

1. CL: primary fuel flow, ground idle (64% Ng), Flight Idle (78-80% Ng), cut-off/feather
2. PCL: sets power, sometimes prop pitch, ground, flight, reverse (beta)

Question 15

Do not move the PCL aft of Idle when:
1.
2.
3.

Answer 15

1. Engine not running
2. In flight
3. With MOR operation
   …else damage

Question 16

MOR (Manual Over-Ride) Used to control engine power during __ failure of the _____ or ___ linkage failure.

• PCL in ___
• Move lever ___
• = __ ITT
• > /= __% Ng (>/+ __% Ng in descent)
• Cond Lvr to __ at touchdown

Answer 16

Control pwr during pneumatic fail of Fuel Ctl Unit or PCL link fail

• PCL must be in idle
• Move lever slowly,
• do not exceed 870 ITT
• do not permit Ng to <65%,
• In descent: set Ng >/= 75%;
• Cond Lvr to Cutoff/Feather at touchdown

Question 17

Fuel Ctl Unit:

1. Driven by ___ pump delivering at __ PSI
2. Does:

Answer 17

1. Hi-Press fuel pump at 800 PSI

2. Fuel schedule for desired power (PCL)

Question 18

1. 3D Cam does ?
2. Ng Governor does?
3. Torque limiter?
4. Np governor

Answer 18

1. 3D Cam: pri for engine speed setting/control
2. Ng Gov: controls Ng speed through 3D cam
3. Q limiter works w/FCU to prevent exceeding 44.3 PSI
   4 Np governor works with FCU to prevent Prop/Pwr turbine over speed

Question 19

Pressure Relief Valve has 2 other valves:

• ___ Valve, that …
• ___ Valve, that …

Answer 19

• Bypass valve, maintains constant pressure delta for more fuel than system can use. >1350 PSI
• Min Flow Valve: stops at 90pph to prevent flameout

Question 20

1. The fuel manifold has ___ manifold adapters to ___ the fuel for combustion
2. Ignition: __ spark igniters use ___ VDC from the ___ Bus
   - Auto = on when ITT < __ and NG > __%
   - Auto = off ___ after ITT > ___

Answer 20

1. The fuel manifold has 14 manifold adapters to atomize the fuel for combustion.
2. Ignition: 2 spark igniters use 28 VDC from the Batt Bus
   - Auto = on when ITT < 500 and Ng > 10%
   - Auto = off 10” after ITT > 500

Question 21

When must I turn ignition on?
1.
2.
3.

Answer 21

1. Heavy precipitation
2. Turbulence
3. Wind shear

Question 22

Oil:

1. Max hot if w/in ___ min of shutdown
2. Max cold >/= __ hours after shutdown and should not be used for Svc
3. Scavenged oil goes through the ______

Answer 22

1. Max hot w/in 10 minutes
2. Max cold >/= 12 hours
3. Scavenged oil goes through oil-to-fuel heat exchanger

Question 23

If dual battery, the starter Ng controller switches between Batt #1 and #2 when?
…and ____ tie held open to ______

Answer 23

Batt #1 start through 10% Ng or 10”
Batt #2 >10% or 10”
…and Gen 2 Bus tie held open to prevent overload

Question 24

Prop:  Size
Pitch changes via \_\_\_\_\_\_\_ governor
Normal fwd thrust pitch at:  Idle, \_\_\_ “forward of Idle, then \_\_ to \_\_
Max Reverse
Feather
Ground Prop speed:

Answer 24

Prop is 105”
Pitch changes via hydraulic oil governor
Idle:  6 degrees, 1/3” fwd = 12 degrees, then 12-19 degrees
Max Reverse: -17.5
Feather:  79.6
Ground Prop Speed:  ~1060

Question 25

Prop pitch angle defaults to ____ by springs. When placed in cutoff/feather, ___ is blocked = no __ for engine = restriction to put the anchors on the prop (to prevent free spinning)during ground ops

Answer 25

Prop pitch defaults to feathered (79.6 degrees) by springs. Placing to off/feather = OIL is blocked = no LUBE for engine

Question 26

Red Fire Detection via steel capillary tube filled with ____ and central ___ charged core that release above a certain temp (both localized and average). It is reversible. Amber Fire Detection = detects ___ in the above system

Answer 26

Red Fire Detection via steel capillary tube filled with helium and central hydrogen charged core that release above a certain temp (both localized and average). It is reversible. Amber Fire Detection = detects leak in the above system

Question 27

Fire: Test is required before __ flight and ___ lights must illuminate. 1st step in fire = ___ shutoff to avoid ___ into the cabin

Answer 27

Test is required before every flight and all 4 lights must illuminate. 1st step in fire = ECS shutoff to avoid toxic gas ingestion into the cabin

Question 28

Fuel: 2 tanks per wing, __ and __ Total Capacity ___ gal Usable ___ gal Anti-Ice additive required for all flights in temps < __ degrees C

Answer 28

Fuel: 2 tanks per wing,main and collector Total Capacity 406 gal Usable 402 gal A/I required <0 degrees C

Question 29

1. Fuel goes from main to collector tanks via ___ with __ valves 2. Vents maintain pressure between ___ to ___ PSI 3. Transfer jet pump and delivery jet pump are operated by ____ (primarily by low-pressure ___)

Answer 29

1. Fuel goes via gravity through flapper valves 2. Vents maintain -0.2 to 2.0 PSI 3. T’fer and delivery pumps operated by motive flow by low pressure Engine Driven Pump

Question 30

Boost Pumps: __ VDC provide ___ GPH at __ PSI during engine __ and conditions of ___ fuel pressure (on at __ PSI, off at __ PSI) - integral to ______

Answer 30

28 VDC provide 91.3 GPH at 31 PSI during engine start and conditions of low fuel pressure (on at 2.0 PSI, off at 3.48 PSI) - Integral to auto balancing

Question 31

1. MX S/O valve has a __ that protrudes, preventing ___ door from closing 2. Fuel Filter has a bypass valve that opens at ___ PSI and will also extend to indicate to MX 3. Air separator sends air from the FCU back to the ___

Answer 31

1. MX S/O valve has a rod that prevents the fuel service bay door from closing 2. Fuel filter bypass valve at 8 PSI 3. Air separator returns air to the fuel tanks

Question 32

Low Pressure EDP provides ___ and fuel to the ___ EDP at ___ GPH and __ PSI. - It is connected to the external ____ pump so if it fails, EDP fails

Answer 32

LP EDP provides motive flow and fuel to the High Pressure EDP at 207.9 GPH and 43.5 PSI - Connected to external oil scavenge pump

Question 33

Oil-Fuel Heat exchanger: Auto opens at: Auto closes at:

Answer 33

Opens <21 degrees C | Closes >32 degrees C

Question 34

High Pressure EDP provides fuel at: 13% Ng = ___ PPH at ___ PSI 100% Ng = __ PPH at __ PSI

Answer 34

High Pressure EDP provides fuel at: 13% Ng = 210 PPH at 75 PSI 100% Ng = 1591 PPH at 800 PSI

Question 35

Low Fuel Warning illuminates when either main think indicates < ___ GAL

Answer 35

<20 Gal = low fuel warning

Question 36

Auto Fuel Balancing 1. Condition lever must be ___ 2. __” delay to prevent rapid on/off cycling 3. Auto on at __% of total Qty (~__ USG or __ LCD segments) 4. The Heavy/Light Wing boost pump turns on 5. Max imbalance is ___ LCD / __ USG / __ #

Answer 36

1. CL must be forward of cutoff/feather 2. 60” delay 3. On at 5% (~10.5 USG or 2 LCD) 4. Heavy wing boost pump on 5. Max imbal: 3 LCD, 26.4 USG, 178#