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Start Procedures for turbine engines can be found?
Airframe Manufactures Manual
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Controls feather , min and max rpm?
Propeller Lever
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Controls reverse , beta , power range?
Power Lever
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Controls Cut-off , low and high idle?
Fuel lever
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Define hung start
No acceration during start
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Define hot start
Exceeding maximum temperature limits on start-up
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Dry motoring run ?
No fuel ,no ignition , cranking starter
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Purpose of a dry motoring run?
To remove trapped fuel or fuel vapor in engine
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Would the boost pump be on or off during a dry motoring run?
on
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Why is the boost pump on during the dry motoring run?
To lubricate engine driven fuel pump
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Why would you choose to leave the boost pump off while doing a dry motoring run?
If you have reason to believe fuel is leaking past the fuel shut off
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How long can you run the fuel pump with the boost pump off ?
10 hours , log time and replace fuel pump when total tome exceeded
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Wet motoring run?
fuel on , ignition off, cranking starter
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Purpose of a wet motoring run?
to test or do checks on the fuel system
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What must be done after a wet motoring run , before starting ?
Dry motoring run
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When first starting what are the 2 gauges to watch?
- N1 speed and oil pressure
- (then ITT after fuell is added)
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At what n1 speed is the fuel lever moved from cut off?
12% N1
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[Starting] N1 reached and fuel being introduced. How long to wait for a ITT rise ?
If no rise what is done?
- 10 seconds
- Abort start if longer
- dry metering run to remove any fuel before restart
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PT6 self sustaining speed?
55% N1
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When starting a PT6 with glow plugs what must be done?
at 12% N1 , glowplugs 5 seconds , then add fuel
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When starting PT6 what is the prop angle set to?
Fine pitch
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What "tool" is used on the KingAir PT6 when setting the max NG speed (topping)?
Part Power trim stop
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When topping max NG with a part power trim stop, what is the desired rpm to see?
97.1%
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How do you adjust the minimum fuel flow on the PT6?
Unhook PY and compare Ng speed to chart , set with the adjustment screw
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Minimum fuel flow adjustment screw moves what?
Metering valve
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How many clicks each direction can the acceleration dome be turned?
3 clicks each way
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Procedure for checking acceleration ? (engine is already warm)
- fuel lever - ground idle
- power lever - max power
- mark power lever position then
- move power lever to 64% Ng
- wait 1 second
- Bring power back to original position and time acceleration -- compare to chart
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What reaon would you adjust the minimum fuel flow setting?
Troubleshooting starts
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When starting the PT6 what are the 6 parameters that must not be exceeded?
- Torque
- ITT
- NG
- NP
- Oil Pressure
- Oil temperature
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Before starting turbine engine without ground cart , what must be checked?
Battery voltage to ensure smooth start
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2 things tracked in between overhauls for limits?
Hours and Cycles
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approaching hot start - what do you do?
- Fuel cut off
- ignition off
- continue cranking
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What position is the bleed valve on startup?
Open
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