Term
Which engine indications are always displayed on the Primary EICAS?
Secondary EICAS? |
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Definition
Primary: N1, EGT
Secondary:
N2
Fuel flow
Oil pressure, temp, quantity
Engine vibration |
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Term
| Describe the N1 indication limits |
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Definition
Red: EEC max N1 limit (117.5%)
Amber: EEC max thrust limit (overboost limit, based on current temp and press)
Green: FMC reference thrust
White: RPM commanded by TL position |
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Term
| When are EGT indications inhibited from changing color to amber? |
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Definition
During takeoff or go-around for
5 minutes after TO/GA |
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Term
| Explain the cyan VVVVVV on the Primary EICAS Display |
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Definition
| Secondary Engine Exceedance Cue |
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Term
| When and where is the In-flight Start Envelope displayed? |
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Definition
Primary EICAS
Fuel Control switch is CUTOFF and Engine Fire switch is IN |
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Term
| When are the secondary engine indications automatically displayed? |
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Definition
EICAS receives power
ENG is selected on control panel
Fuel control switch is in cutoff during flight |
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Term
| What are the basic functions of the EECs |
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Definition
Auto-start
Auto-relight
Fuel metering
Engine internal and turbine cooling |
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Term
EEC
How does Alternate Mode differ from Normal Mode? |
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Definition
N1 is controlling in both modes
Alternate mode:
Max N1 < full forward (full thrust can overboost the engines)
Manually adjust thrust as conditions change (temp, pressure, anti-ice, bleeds) |
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Term
EEC Alternate Mode
How does automatic selection differ from manual selection? |
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Definition
| Thrust increases when Alternate Mode is selected manually |
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Term
| When is Approach Idle used instead of Minimum Idle? |
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Definition
Nacelle anti-ice
Flaps in landing position
Continuos ignition
(until 5 sec after touchdown)
Thrust reverser ops |
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Term
| Explain the RUN and CUTOFF positions of the Fuel Control switches. |
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Definition
RUN
Opens eng & spar fuel valves
EEC starts engine or
Energizes igniters if Autostart OFF
CUTOFF
Closes fuel valves, stops ignition
Demand Pump ON if in AUTO
Unlocks Engine Fire switch |
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Term
| What occurs when an engine start switch is pulled? |
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Definition
Arms or opens start valve
(auto start switch ON/OFF)
Opens engine bleed air valve |
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Term
| What is the start sequence for Autostart? |
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Definition
Autostart ON - arms autostart
Pulling Start switch - arms start valve, opens engine bleed air valve
Fuel Control to RUN - initiates autostart sequence
Starter cutout 50% N2 -
start switch IN, start and bleed air valves close, start light out, ignition off |
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Term
| What types of start malfunctions are automatically aborted? |
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Definition
Hot start
Hung start
No EGT rise |
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Term
| How is a flameout detected? How does the EEC handle this? |
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Definition
A rapid decrease in N2 or
N2 < idle RPM
Both ignitors are activated |
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Term
| What is the start sequence for Manual start? |
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Definition
Pulling start switch opens start and engine bleed air valves
Start light illuminates
When N2 reaches Fuel-On indicator, Fuel Control to RUN
Spar, fuel metering and engine fuel valves open
Selected igniter energizes
Starter cutout at 50% N2
Start switch moves to IN, start and bleed air valves close, start light out, ignition off |
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Term
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Definition
Norm - AC power
Stby - Main Stby bus |
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Term
| What is the function of the Standby Ignition selector in NORM? |
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Definition
| If AC system is not powered, standby system continuously powers all igniters |
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Term
| What is the function of the Auto Ignition selector in the SINGLE position? |
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Definition
EEC alternates Igniter 1 and 2 after every second ground start
EEC selects both igniters for in-flight start or flameout |
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Term
When is ignition automatic for selected engines?
All engines? |
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Definition
Selected:
During start when N2 < 50%
Nacelle anti-ice is ON
Flameout is detected
All:
Trailing edge flaps out of UP
Continuos ignition is ON |
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Term
| How is low engine oil quantity depicted? |
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Definition
Oil quantity indication turns magenta
No EICAS msg |
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Term
| How is engine oil cooled? |
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Definition
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Term
| What can an increase in oil quantity during cruise mean? |
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Definition
Indicator malfunction
Leaking fuel/oil heat exchanger |
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Term
How is the engine thrust reversal actuated?
LCF & -8? |
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Definition
Pneumatically actuated fan air
LCF & -8 have hydraulic reversers |
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Term
| What happens if a thrust reverser is deployed in flight? |
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Definition
| The reverser system applies bleed air to stow and lock the reverser |
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Term
| What occurs when idle reverse is selected? |
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Definition
Autothrottles disconnect
Thrust levers are locked in idle
Spoilers deploy if not armed |
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Term
| What are the different engine vibration sources that are displayed? |
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Definition
FAN - fan
LPT - N1 low pressure turbine
N2 - N2 rotor
BB - broad band, source is unknown, average is displayed |
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