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63 Cards in this Set
- Front
- Back
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Name and type of engines |
CFM56-7 Dual-rotor Axial flow Turbofan |
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N1 rotor drives what? |
Fan Low-pressure conpressor Low-pressure turbine |
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N2 rotor drives what? |
High-pressure compressor High-pressure turbine Engine gear boxes Driven by bleed air start motor |
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Primary engine indications |
N1 EGT (Fuel flow) (Fuel quantity) |
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Secondary engine indications |
N2 (Fuel flow) Oil pressure Oil temperature Oil quantity Engine vibrations |
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Secondary indications auto display on lower DU when... |
- initial startup - in flight: start lever CUTOFF or N2 below idle - secondary engine out of limit |
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Red lines operating limits for which engine indications? |
N1 EGT N2 Oil temperature Oil pressure |
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Amber caution range on normal display for which engine indication? |
EGT |
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Engine gauges that turn amber in caution range |
Oil temperature Oil pressure |
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What gives direct engine inputs when EEC is not powered? |
Sensors |
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When is the EEC energized? |
15% N2 |
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Indications displayed during battery start |
N1 N2 Oil quantity |
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amber ENGINE FAIL alert indicated when... When does indication disapear? |
start lever at IDLE and engine at low sustainable idle (50% N2) - engine recovers - start lever CUTOFF - fire switch pulled |
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Compact display used when... How are indications displayed? |
either display unavailable Primary as normal and secondary digital |
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How many EEC's? How many channels per EEC? |
1 per engine 2 channels for redundancy |
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How does normal EEC mode work? |
EEC compares commanded N1 to actual N1 and adjusts fuel flow as required. |
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EEC alternate modes: soft and hard, how do they work? |
Soft: when normal signals not available, EEC automatically switches and uses last available indications. ALTN switch illuminates and ON indication visible. Hard: when thrust lever to idle (ON indication remains) or pressing ALTN (ON indications blanked) |
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Alternate mode thrust; equal to, lower or higher than normal thrust? |
Higher |
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EEC purpose? |
Protection against N1 and N2 exceedance. |
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EEC idle operations |
Ground minimum idle Flight minimum idle Approach minimum idle |
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EEC approach minimum idle start when... |
- flaps landing configuration - engine anti-ice ON - descending below 15000 ft |
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Fuel system 4 stages and purpose What comes after these stages? And what happens there? |
1. First stage engine fuel pump - increases pressure 2. Fuel/oil heat exchanger - first IDG, than main fuel oil heat the fuel 3. Fuel filter - removes contaminents 4. Second stage engine fuel pump - adds more pressure Hydro mechanical unit (HMU): EEC meters fuel here |
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Alert when satutated fuel bypasses filter |
FILTER BYPASS alert |
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Spar valve location |
Engine mounting wing station |
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Oil pressure sensor location |
Downstream of oil pump, prior to engine lubrication |
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Oil system pressurized by... |
Engine driven oil pump |
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Alert when scavenge filter becomes saturated |
OIL FILTER BYPASS alert |
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2 requirements to start engine |
1. Bleed air (APU/ground cart/other engine) 2. Electrical power |
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Battery start |
Closes bleed air and opens start valve, pressure rotates starter |
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amber START VALVE OPEN alert |
Start valve open |
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Is the starter directly connected to the N2 compressor? |
No, connected through accessory drive gearbox |
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When should you open the start lever to idle? |
25% N2 (max motoring) |
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What does the start lever control? |
Spar valve and engine fuel valve and EEC fuel and ignition supply to combuster. |
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What is the starter cutout speed? |
56% N2 |
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Indications during hot EGT start/compressor stall? |
EGT box flashes white Exceeding limit: EGT indication turns red EGT cools down: white indication and red box after shutdown
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How to resolve a hot start/compressor stall? |
Start lever to CUTOFF or automatically by EEC (stops ignition upon reaching idle N2) |
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Wet start indication? How is it resolved? |
EGT does not rise after moving start lever to IDLE. After 15 seconds EEC stops ignition |
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Methods of in-flight starting |
Windmill and X-BLD (indication above N2 gauge) |
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How many igniters? Armed by...? Busses connected to L & R igniters? |
2 per engine EEC IGN L: AC XFR BUS 1 IGN R: AC STBY BUS |
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Auto-relight: when and how? |
When uncommanded rapid decrease in N2 or N2 below idle is detected. EEC detects flameout and activates both igniters. |
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Thrust reverser hydraulic systems |
System A: No. 1 engine System B: No. 2 engine Standby system for redundancy, but at a slower rate |
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Function of left and right translating sleeves |
Cause blocker door to deflect fan air forward through fixed cascade vanes |
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When is amber REV indication illuminated? |
While thrust reverser control valves move to deploy position after electro-mechanical lock is released |
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When is green REV indication illuminated? |
Thrust reverser control valves reach deploy position. Ready for max reverse. |
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REVERSER light illuminates How long does it stay on? |
Downward motion of thrust reverser. 10 seconds, if more than 12 seconds: ENG system annunciator and master caution |
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What is auto-restow? |
Uncommanded motion of reverser sleeves, isolation valve opens until actually commanded. |
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How does system know reversers may be used (know it's on the ground)? |
RA less than 10 ft or air/ground safety sensor |
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Airborne Vibration Monitoring system (AVM) functions |
- displays low and high pressure vibration - balances low pressure rotor to reduce vibrations |
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How many packs suplied with air by APU (ground/flight)? And electrical power? |
Both packs on ground, 1 in flight. Electrical power up to max certified ceiling. |
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APU electrical requirements for operation |
- fire switch in - fire control handle in - battery switch ON |
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APU start requirement |
Battery switch ON |
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APU start sequence Where does APU get fuel from? |
- APU switch to START (opens air inlet door) - ingition when reaching proper speed - APU GEN OFF BUS light on (ready to provide bleed air or power) Fuel from left side of fuel manifold |
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APU EGT exceedance, what happens? |
Automatic shutdown |
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Time limit to reach proper APU speed |
120 seconds |
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APU FAULT light on meaning? Restart allowed? |
Start fails or APU GEN OFF BUS light fails to illuminate Yes, if light extinguishes after 5 minutes |
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APU shutdown sequence |
APU switch OFF: generator tripped, bleed valve closed, APU GEN OFF BUS light off Shutdown after 60 seconds |
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What is ECU? What does is do? |
Electronic Control Unit Automatic APU shutdown after: - overspeed conditions - low oil pressure - high oil temperature - fire - fuel control unit failure - EGT exceedance |
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What happens if APU EGT limit is exceeded? |
Electrical load only used: load is shed Electrical load and bleed air used: inlet guide vanes towards closed to reduce bleed air Electrical loar and bleed air during engine start: first load is shed, bleed air reduced if necessary |
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Automatic APU load shedding in flight |
Galley and main busses shed first, if necessary also IFE busses |
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Automatic APU load shedding on the ground |
Galley busses and main busses shed. Switch CAB/UTIL power OFF and back ON to restore power. |
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Can APU still be operated with blue MAINT light illuminated? |
Yes |
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APU shutdown, what happens if fuel valve does not close? |
FAULT light illuminates after 30 seconds. Pull APU fire switch |
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TAI stands for? Displayed where? |
Thermal Anti Ice Above N1 indication |
