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25 Cards in this Set
- Front
- Back
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What is the primary source of DC power when on the ground and the engines are not running?
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24-26v batteries
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Selection of the three-position switch to BAT 1 prompts reading of the:
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Left battery amperage
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The battery reverse current relay opens if there is a:
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250 amp continuous reverse current
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When the battery reverse current relay opens due to a reverse current of 250 amps, it causes the associated:
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1. BAT switch to trip
2. BAT light to illuminate |
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Where are the batteries located?
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Rear compartment
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The HOT BAT light comes on when the battery temperature reaches what temperature?
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150 deg F
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What preliminary warning is given to indicate the battery is getting hot?
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Amber WARM light illuminates
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How is it possible to indicate an approximate battery temperature on the battery temperatue indicator if the temperature is less than 100 deg F?
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Depress the LESS 50 pushbutton
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What systems are directly supplied from the battery bus?
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Mod center lighting, pressure refueling, fire extinguishing, and service lights
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When the EXT POWER pushbutton is depressed:
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Both batteries #1 and #2 are isolated.
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If the generator fails (trips), what action is required to reset its output?
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Move the generator switch to ON
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Which engine generators supply electrical power to the main left DC bus?
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#1 and #2
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What generators supply power to the main right DC bus?
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#3 and APU
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Where is the grd power receptacle?
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On right aft side of the fuselage
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What voltage is required from a ground power unit?
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28v DC
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How is grd power applied to the airplane?
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By pressing the EXT PWR pushbutton
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When grd power is connected and selected, which lights illuminate?
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BAT 1, BAT 2, GEN 1, GEN 2 and GEN 3
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When you need to Shed electrical power, what items do you turn off?
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1. Tranfer Pumps
2. Side Window Heat 3. Galley Power |
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When will a generator switch trip?
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D- Dead Short
O- Over voltage R- Reverse Current M- Mechanical |
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The bus tied relay receives its power from:
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Both RH and LH bus
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What is the normal voltage and overvoltage?
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Normal- 28.5v Overvoltage- 32v |
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What is the max output for the generators?
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350 amps for 1 min 300 amps when FL 390 and below 250 amps when above FL 390 |
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What does the GCU do after the start?
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GCU will reduce generator voltage after start (-1v) for 3 min to soft charge the batteries.
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What items will drop a generator off line?
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D- Dead Short- trips the generator switch O- Over Voltage- at 32V, trips the generator switch R- Reverse Current- trips the battery switch M- Mechanical |
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