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34 Cards in this Set
- Front
- Back
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How is CSD oil cooling provided?
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By fan stage air at all times.
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What are the basic CSD Temp limitations?
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Max IN: 120 Deg
Max RISE: 20 Deg Max IN + RISE: 130 Deg |
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What are the extended CSD temperature limitations and when can they be used?
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Max IN: 135-140 for 2 hrs, 140-160 for 50 min. They apply only when all three IN temps are high due to ambient conditions
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What do the IN and RISE temperature indicate?
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Oil cooler effectiveness (IN) and CSD workload (RISE)
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What power source is required for the generator control panel?
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Battery Complex with the Battery Switch ON
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What is the purpose of the Field Relay?
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It energizes the exciter field and provides ON / OFF generator control.
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What is the purpose of the Generator Breaker?
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It connects the generator output to its respective AC bus.
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What is the purpose of the Bus Tie Breaker?
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It connects the respective AC bus to the tie bus.
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What are the voltage and frequency limitations for an operating generator?
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Voltage: 115 +/- 5
Frequency: 400 +/-8 |
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What are the KW load limits?
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Three in parallel: 102.5KW
Two in parallel: 54KW Any isolated generator: 36KW |
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What are the KW and KVAR variance limits?
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7 KW / 3 KVAR
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What happens when the Frequency Control Knob is rotated?
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It changes the frequency (isolated) or biases the load controller (paralleled)
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What do the synchronizing lights indicate?
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They indicated the phase difference between the selected generator and the source on the tie bus. Lights out indicates sources are in phase.
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What is the concern about manual paralleling?
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When manually paralleling, you must wait for the sync lights to extinguish before closing the Bus Tie Breaker. Otherwise damage to the CSD may occur (QRH only).
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What is the concern about checking residual voltage?
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If the field is not tripped or the generator is not selected, then the voltmeter may get damaged (QRH only)
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What should the residual voltage read when the CSD is disconnected?
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Zero volts
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What is the normal residual voltage?
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10 to 18 volts
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How is the Essential AC Bus powered?
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The generators power Essential AC through the "essential screw." APU and External Power power Essential AC through AC Bus 3 (the No.3 Bus Tie Breaker must be closed).
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What is the priority for selecting a generator to power Essential AC? Why?
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The priority is 3,1,2. Generators 3 and 1 provide better separation of power between the flight instruments. Generator 3 is first because AC 3 is the least loaded bus.
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What happens when the Essential Power Selector is positioned to STANDBY?
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The Battery Complex powers Standby DC directly and Standby AC through the static inverter. Essential AC is not powered.
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What are the normal power sources for the Standby Busses?
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Essential AC powers Standby AC. Essential DC powers Standby DC.
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What is auto standby switching and when will it occur?
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If essential power fails on some aircraft and the Essential Power Selector is in GEN 1, 2 or 3, the Standby Busses will automatically get powered by the Battery Complex.
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What are the power sources for the ESSENTIAL POWER FAILURE light?
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The light itself is powered by the Battery Complex.
The light control is powered by Essential 28 V AC |
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What does a flashing WARN light (forward panel) indicate?
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A loss of power to Essential AC with Main AC still available
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What are the TR voltage limits?
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24 to 30
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What are the TR amperage limits?
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Positive to 50 (without equipment cooling)
Positive to 65 (with equipment cooling) |
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What does a zero volt or zero amp reading indicate when the DC Meters Selector is in a TR position?
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A failed bus (zero volts) or a failed TR (zero amps)
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What are the possible sources of power to the DC busses?
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DC1 or 2 can be powered by either TR 1 or 2. Essential DC is powered by the Essential TR normally or by TR 1 or 2 as a back up.
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When AC power is on line and the DC Meters Selector is in the BAT position, what is being checked?
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The battery charger is checked with 24 to 30 volts and zero or positive amps.
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What position should the DC Meters Selector NOT be in when leaving the airplane and why?
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BAT position. The gauges are powered from the hot battery bus and will drain the battery.
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What type of fault is indicated by a Generator Breaker Trip?
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Speed
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What are the phase ones for loss of all generators?
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Essential Power - STANDBY
Battery - CHECK ON Field Switches - CLOSE - if all field lights remain illuminated: Battery Switch - OFF, IMMEDIATELY ON Field Switches - CLOSE AC Meters - CHECK VOLTS/FREQUENCY Essential Power - OPERATING GENERATOR (3,1,2) Fuel Crossfeed Selectors - ALL OPEN |
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How long will the battery last on standby power?
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Approximately 25 mins.
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What equipment is powered only when an engine-driven generator is on line?
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Flight recorder, autopilot, stall warning, yaw dampers.
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