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17 Cards in this Set
- Front
- Back
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FADEC consists of what three components? |
-Hydromechanical Unit -Electronic Control Unit |
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The HMU consists of what four components? |
-Fuel pump -Fuel metering assembly -Stepper motor -Hydromechanical actuator (switches between auto and manual modes) |
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ECU continuously monitors what two parameters to control the HMU? |
Internal -collective potentiometer -Auto/Manual mode switch -Permanent Magnet Alternator 28VDC -Throttle potentiometer External -Ambient pressure sensor -NR sensor -NG sensor -NP sensor -Compressor temperature sensor -Oil pressure transducer -Thermocouple probes (4)
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Three FADEC system checks |
-Continuity -Rate -Proper range of the sensors |
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The HMU is only electrically linked to the throttle via the ECU (T/F) |
False. There is a mechanical linkage directly to the HMU. |
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Automatic Start procedure |
-FADEC switch AUTO -Throttle IDLE -Start switch activated w/in 60s -Start switch pressed >1s -Fuel introduced 10% NG OAT<80F or 12% NG OAT>80F -FADEC automatically accelerates to IDLE -NG 50% Start relay disengages -ECU self-test igniters active until 60% (AUTO-Relight extinguishes) -IDLE= 63+-1% |
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During what three conditions does FADEC automatically cut fuel to prevent a hot start? |
Below 50% NG:
MGT >885C <10k ft AND MGT <82.2C at start initiation (5% Ng)
(912C >10k ft and/or MGT >82.2C at start initiation (5% Ng))
Voltage at ECU drops below 10.3 VDC during the start
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During an aborted start (either manually or automatically) what does the FADEC do? |
-keeps starter engaged up to 60s to drop MGT to 150C |
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Why should you not use the starter switch to abort a start sequence? |
STARTER DISENGAGE only de-energizes the starter and ignitor circuits.
Done after light-off below 50%NG: -ECU will modulate fuel flow OR -ECU will cutoff fuel flow after MGT exceeds hot start limit |
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What are the 8 different FADEC messages you can receive? |
RED -ENGINE OUT -ENGINE OVERSPEED -FADEC FAIL
YELLOW -FADEC MANUAL -FADEC DEGRADED -FADEC FAULT
WHITE -RESTART FAULT -AUTO RELIGHT |
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If the FADEC fault is minor, when is it displayed? |
Only on shutdown as FADEC DEGRADED |
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What needs to be accomplished after any FADEC-related light? |
Maintenance action required |
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What should you do if you see FADEC DEGRADED in flight? |
You may have NR droop,NR lag, or reduced power. RESTART FAULT may also be displayed.
Fly smoothly and non-aggressively
Continue flight (maintenance action required prior to next flight) |
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What should you do if FADEC FAULT is displayed? |
PMA, MGT, NP, or NG fault detected. (RESTART FAULT may be lit)
"Refer to flight manual" |
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What should you do after "RESTART FAULT" illuminates |
No immediate action required. Do not plan on another restart unless maintenance action is performed |
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What happens if you get a FADEC FAIL light? |
-A horn beeps -FADEC goes to MANUAL mode -increase or decrease of NG/NP may occur within 2-7 seconds -Match throttle bezel to indicated NG speed to minimize change |
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NG/NP overspeed protection is available under what circumstances? |
-Both auto and manual modes -NG overspeed protection may not be available during FADEC FAIL |
