Flashcards in Engine Deck (13):
How many of what type of spark plugs do the PT6A-67D engines use?
Two spark type igniters per engine.
When the auto ignition is armed below what torque do the igniters activate?
To what SHP is the PT6A-67D engine flat-rated to?
ow much air do the PT6A-67D engines use to centre the flame in the combustion chamber?
75%; the rest is used for combustion.
By what is the engine intake lip heated?
Engine exhaust air.
To what is the minimum fuel flow stop in the FCU set to?
90lbs/hr per engine
From where does the FCU receive inputs from?
- N1 flyweight governor
- prop lever
- condition lever
- power lever
- pneumatic bellows
Are the axial compressors more effective at low or high speeds?
If no ITT raise is indicated within ..... seconds after introduction of fuel, the start should be aborted.
When does the P2.5 compressor bleed valve start to close?
Why does the P2.5 compressor bleed valve close at higher RPM's?
It is open in first place to allow air to escape the compressor stage as this would introduce too much air into the combustion chamber. As RPM's are increased the engine can cope with higher air intakes.
During a power increase, what indications will lead us into the conclusion that the compressor bleed air valve is failed in the open position?
- Higher ITT
- Lower torque