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32 Cards in this Set
- Front
- Back
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apu is equiped with a ________ pressure system
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high
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the oil filter and filter by-pass are located
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in the oil cluster
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oil tank may be serviced by opening
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left access door
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the low oil pressure switch is located
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on the right side of the oil tank
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with aircraft on the ground what initially gets the apu rotating for start
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dc motor
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what parts of the compressor serves to convert mechanical energy into pneumatic energy
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impeller and diffuser
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what kind of energy is the pneumatic energy converted to in the combustion section
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thermal
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where is the gearbox mounted on the apu
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front
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at what percent (rpm) does combustion normally occur
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10%
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at what percent (rpm) does the starter normally cut out
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35%
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at what percent (rpm) does the ignition normally cut out
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95%
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what component protects the turbine from excessive temperatures during a bleed load
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thermostat
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apu should not droop more than ___ percent under full load
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2
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what kind of generator is on the apu
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ac generator
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what kind of stater is on the apu
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dc starter
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the apu turbine wheel rotates at _____ rpm at 100%
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41,100 rpm
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what is the apu max operating altitude
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35k
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apu consumes _____ at idle
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250 pph
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apu consumes _____ with a load
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350 pph
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what is the apu max starting range altitude
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30k
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the ram air door is opened during start up until what rpm
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95%
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the non ram door is opened at what percent
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95%
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______ reduces speed and drives accessories
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gearbox
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________ converts ambient air to pneumatic energy
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compressor
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________ converts pneumatic energy to thermal energy
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combustor
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_________ converts thermal energy to mechanical energy to drive the compressor, accessories, and load
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turbine
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oil pressure sequencing switch requires how much psi to start apu
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2 1/2-4 psi
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OIL SUB-SYSTEM
cleans, cools, and lubricates bearing areas, seals, and accessory gear case |
pressure
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OIL SUB-SYSTEM
removes oil from the main engine and accessory drives and sends it back to the oil tank |
scavenge
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OIL SUB-SYSTEM
pressurizes and/or depressurizes bearing area |
breather
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the apu oil filter has how many microns
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10
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the oil high temp. light goes on at
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121-124c
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