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81 Cards in this Set
- Front
- Back
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What does Essential AC bus relay No. 1 do when its energized?
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Connects power from Bus A to MEAC bus.
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What does the Essential AC bus relay No. 1 do when its de-energized?
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Connects the essential AC bus monitoring relay to MEAC bus
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How can the normally energized Essential AC bus relay No. 1 be de-energized?
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By placing ESS BUS monitoring switch to OFF.
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What does the Essential AC bus monitoring relay do when energized?
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Connects power from RAR circuit to essential AC bus relay No. 1
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How can the normally energized Essential AC bus monitoring relay be de-energized?
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By placing ESS BUS monitoring switch OFF
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What does Essential AC bus relay No. 2 do when energized?
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Connects power from RAR circuit to FEAC
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What does Essential AC bus relay No. 2 do when de-energized?
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Connects Bus A to FEAC
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What buses are located in the Forward Load Center Circuit Breaker Panel (FWD)?
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1. MEAC Bus
2. EXT MDC Bus 3. APU ESS bus 4. MEDC Bus |
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What buses are located in the Forward Load Center Circuit Breaker Panel (AFT)?
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1. SEAC bus
2. SEDC bus 3. GOB 4. 28VAC Forward Lighting Bus XFMR 5. 26VAC Instrument Bus XFMR No. 1 6. 26VAC Instrumen Bus XFMR No. 2 |
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What buses are located in the Forward Load Center Lower Circuit Breaker?
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1. FEAC Bus
2. FEDC Bus 3. MEDC Bus 4. Essential DC bus feeders 5. MEAC Bus Feeders 6. No Name |
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What buses are located in the Main Load Center Circuit Breaker Panel?
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1. Main DC Bus
2. Main AC Bus A 3. Main AC Bus B 4. 28VAC Aft Lighting Bus XFMR |
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What are the bus priorities for FEAC?
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Gen 2
External Power Gen 4 APU Gen 3 Bus A |
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What is the bus priorities for MEAC?
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Bus A
Gen 2 External Power Gen 4 APU Gen 3 |
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What is the bus priorities for SEAC?
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MEAC
SEDC via Inverter |
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What is the bus priorities for Bus A?
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Gen 2
External Power Gen 4 APU Gen 3 |
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What is the bus priorities for Bus B?
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Gen 3
External Power Gen 4 APU Gen 2 |
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What is Main DC's normal and alternate Power source?
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TR No. 1 and TR No. 2 operating in parallel
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What is EXT Main DC's normal and alternate power source?
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Normal - Main DC
Alternate - No alternate |
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What does MEDC (SAM) feeders power?
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Feeder 3 - SEDC
Feeder 1 - armament Feeder 2 - MEDC (electric) |
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What is MEDC (SAM) normal and alternate power source?
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Normal - TR No. 3
Alternate - EMDC bus through power - blocking diode No. 1 |
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What is MEDC's (electrical) normal and alternate power source?
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Normal - MEDC (sam)
Alternate - No alternate |
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What is FEDC's normal and alternate power source?
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Normal - MEDC through power - blocking diode No. 2
Alternate - aircraft battery |
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Is their any way to secure FEDC?
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No, it does not have a feeder circuit breaker
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What is the normal and alternate power source for GOB?
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FEDC though de-energized GOB relay
Alternate - No Alternate |
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What is the normal and alternate power source for APU ESS?
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Normal - MEDC (electic) through energized MEDC (electric) powe sensing relay.
Alternate - GOB throught de-eergized MEDC bus (electric) power sensing relay. |
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What is the normal and alternate power source for SEDC?
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Normal - MEDC (Feeder 3) bus through de-energized inverter powerer relay
Alternate - FEDC bus through energized inverter power relay. |
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What are the 5 possible malfunctions if the External power available light ON is on but there isno power into the aircraft?
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1. Wrong Phase, frequency, or voltage
2. Nosegear uplock not properly positioned 3. Battery not connected 4. Generator No. 4 RAR feeder circuit Breaker out 5. External power control circuit breaker out |
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What are the possible malfunctions if the FEAC bus is the only one energized?
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1. MEAC ganged CB out
2. ESS Bus monitoring switch OFF |
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What is the possible malfunction if the MEAC, SEAC, and FEAC buses are energized, but MEDC, BUS A, and BUS B are not?
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TR 3 circuit breaker out
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What has similair effects as TR 3 circuit breaker out except that elctronic and armament power will be available through DC feeder #1 adn SEDC bus will be available through DC feeder #3?
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Essential DC bus feeder circuit breaker No. 2 out.
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What are the 3 different models of APU?
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GTCP95-2
GTCP95-3 GTCP95-10 |
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What is the purpose of the APU?
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To provide pnuematic and electrical power necessary to make the aircraft self sufficient.
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True / False
Bleed air from the APU is available in flight |
FALSE
APU bleed air in not available in flight |
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What does the APU provide?
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Electrical
Bomb bay heating Aircraft A/C Main Engine Starting |
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What are the Intake and Exhaust doors Power Source?
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APU essential DC bus
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What are the 2 main sections of the APU?
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Accessory Section
Compressor and Turbine Section |
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True / False
Ground AC and engine starting CANNOT be used simultaneously |
True
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True / False
Ground AC and bomb bay heat CAN be used simultaneously |
True
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What type of turbine is on the APU?
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Single stage radial inward flow turbine
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When does the oil pressure sequence switch close?
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approx 10% RPM with positive oil pressure
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At what RPM is the starter motor de-energized?
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35%
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At what RPM does the igniton de-energize, read-to-load circuitry energizes and hour meter/start counters start?
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95%
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Which APU's have start hour meters and start counters?
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-2 has starts hour meter
-3 and -10 has start counter |
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When does overspeed protection kick in?
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106%
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What are the power sources for the starter motor?
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If MEDC is available through EMDC
If MEDC is not available through FEDC |
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How much fuel an hour does the APU consume during nomal operating condiitons with the AC on?
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300 pounds per hour
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Where is the normal fuel supply?
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Wing Tank #2 but can also be supplied by Wing tanks 1, 3, and 4 by crossfeed system
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Where is the manual fuel shut-off valve located?
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Port Flap Well
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What is the purpose of the load control and pneumatic system?
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control amount of air which may be bled from the compressor
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What is Load Control Valve power source?
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GOB though APU 95% switch
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What is the APU oil tank capacity?
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1.0 gallon
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When does the APU oil tank require servicing?
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when oil level is @ or below half mark on lower sight gauge
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What are the 2 oil types?
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Primary - MIL-PRF-23699
Alternate - MIL-PRF-7808 |
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What is the temp limits on MIL-PRF-23699?
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-40*C - 54*C
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What is the temp limits on MIL-PRF-7808?
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-54*C - 54*C
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What does the tachometer indicate?
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Gas turbine engine speeds in percent RPM
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Where does the tachometer receive its input from?
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APU Tachometer Generator
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Where does the Exhaust Gas Temperature (EGT) receive its input from?
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APU Exhaust thermocouples
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How long will the APU doors closing delay after "OFF" is selected?
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1 min
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What does the "ARM" position allow on the INFLIGHT ARMING switch?
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Allows APU to be operated in flight
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What is the power source for the signal lights?
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APU essential
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When does the (fire) Detection System actuate?
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when temperature of 400*F is exceeded
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Where is the extinguishing system located?
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Nose wheel well
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What extinguishing agent is used in the High Rate Discharge (HRD) container?
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Bromotrifluoro mehtane
CF BR 3 |
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What is the expelling agent used in the extinguishing system?
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Dry Nitrogen
600psi @70*F |
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What is the power source for The Extinguishing System?
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APU Essention
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Where is the APU fire warning and extinguisher panel located?
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copilot center glare shield
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Where are the APU fire warning horns located?
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Flight station and Cabin
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What is the power source for APU Fire detection TEST switch?
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APU Essential
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What happens when "SAFE" is selected on the APU and Fire Extinguishing Safety Switch?
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1.Intake and exhaust doors can not be moved
2. APU cannot be started, if APU running it shuts down 3. Deactivates fire extinguishing system, but fire detection is still operative |
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How long until extinguishing agent will automatically discharge if exhaust doors fail to close?
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20 sec
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What is the maximum altitude for APU operation?
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20,000 ft
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What is the maximum altitude for using the APU as a bleed air source for main engine starting?
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6,000 ft field elevations
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What is max continuous, max for 10 sec, and max peak for GTCP95 - 2?
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688*C
710*C 715*C |
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What is max continuous, max for 10 sec, and max peak for GTCP95 - 3?
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649*C
N/A 704*C |
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What is max continuous, max for 10 sec, and max peak for GTCP95 - 10?
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649*C
710*C 732*C |
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What is the APU ground RPM range?
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98-102%
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What is the APU Flight RPM range?
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98-103%
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What is APU over speed?
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106%
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What is the max airspeed with doors open?
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225 knts
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What is the purpose of load monitoring?
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Reduces or secures certain electrical loads during single generator operation.
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