Term
| When is APR activated? How much? What indication? |
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Definition
N1<67.6% on one engine
2% increase
APR icon in N1 guage |
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Term
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Definition
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Term
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Definition
N1 - 1 fan, 4 stage turbine
N2 - 14 stage compressor, 2 stage turbine |
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Term
| What is located on the accessory gearbox? |
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Definition
Engine lubrication pumps
Engine-driven HYD pumps
Engine-driven fuel pumps
Internal drive AC generator (IDG)
Air turbine starter |
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Term
| How many ways can the fuel system be shut off? |
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Definition
Thrust levers - shuts off fuel at FCU
FIRE PUSH sw/lt - closes fuel SOV |
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Term
| What is the purpose of the engine-driven fuel pump? |
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Definition
| Generates motive flow for scavenge and main ejector pumps |
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Term
| What is the function of the ECU? |
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Definition
Electronic Control Unit (N1 Control Amplifier)
Trims FCU output fuel to maintain N1 for a given thrust setting |
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Term
| When are the engines under N1 Speed Control? N2? What is controlling? |
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Definition
N1 Speed Control >79% (N1 Control Amplifier controls N1)
N2 Speed Control <79% (FCU hydromechanically controls N2) |
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Term
| When is APR armed? How long? What indication? |
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Definition
N1>79%
5 min
"APR ARM" advisory |
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Term
| What is APR? When it is functional? How much increase? |
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Definition
Automatic Performance Reserve System
If N1 on one engine drops below 67.6%, the operating engine increases N1 by 2% (500 lbs thrust) |
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Term
| How is the engine oil system monitored? What are the warning indications? |
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Definition
Pressure switch - "L/R ENG OIL PRESS" warning
Pressure transmitter - EICAS readout turns red |
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Term
| Which bleed air stages extract air? |
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Definition
7th - pressurization of oil seals, venting of engine sumps in lubrication system
10th - air conditioning, pressurization, engine starting
14th - engine cowl and wing anti-ice, thrust reversers |
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Term
| What are the minimum bleed air pressures for start when using the APU? External air? Cross-bleed? |
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Definition
APU - 40psi
External air - 45psi
Cross-bleed - 60psi (approx 85% N2) |
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Term
| What is the maximum N2 that the Air Turbine Starter can dry motor to? |
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Definition
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Term
| What happens when the "START" sw/lt is pushed? |
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Definition
Left, right and isolation 10th state bleed air SOVs open
Starter Control Valve opens
White "START" sw/lt |
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Term
| How are Ignition A and B powered? |
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Definition
A - AC ESS BUS
B - Battery Bus through the static inverter |
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Term
| What are the three modes of ignition? |
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Definition
Normal - A or B, ignited from starter engagement to cutout
Continuous - A and B
Auto-Ignition - Auto-continuous (stall warning computer) |
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Term
| Where are engine vibrations detected? What indications are there? |
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Definition
N1 fan - "FAN VIB" at 2.7 mils
N2 core - "VIB" icon in N2 gauge at 1.7 mils |
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Term
| Which computers and systems receive information from the thrust levers? |
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Definition
N1 Control Amplifier
FCCs, DCUs
Landing gear warning system
Takeoff config warning
Cabin pressurization
Ground spoilers |
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Term
| How many types of inflight protection are there for the thrust reversers? |
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Definition
5
Thrust reverser relays - energized by WOW or wheel spin up
Flexshaft lockpin and lockcam - prevents uncommanded travel by more than 1/4"
Auto-stow - if lockcam fails, 14th stage engergizes stow solenoid, stows reverser
Auto-retard - auto-retards thrust lever whenever thrust reverser is in transit
Emergency stow - "UNLK" sw/lt directs PDU to stow unlocked reverser |
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Term
| When is the thrust reverser "UNLK" sw/lt illuminated? |
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Definition
PDU is unlocked
Flexshaft lock is released
TR not fully stowed
In flight, moves 1 1/4" |
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Term
| "ENGINE" warning and caution |
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Definition
Warning - N1, N2, or ITT exceeds limit
Caution - N2<57% in flight |
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Term
| "L/R ENG OIL PRESS" warning |
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Definition
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Term
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Definition
| APR has been inadvertantly activated on both engines |
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Term
| "REV UNLOCKED" and "REV UNSAFE" cautions |
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Definition
REV UNLOCKED - moved away from stowed position without a deploy command
REV UNSAFE - unarmed TR received a deploy command |
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Term
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Definition
| Engine SOV is closed after activation of ENG FIRE PUSH sw/lt |
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Term
| Where are impending oil filter bypass indications provided? |
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Definition
| JB5 electrical box in aft equiptment bay |
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Term
| If both engines are started using APU bleed air, what is the limitation for the operating engine's thrust? |
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Definition
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Term
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Definition
| DCU has different readings for the same engine: N1, N2 - 5% ITT 40° difference |
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