Engines Flashcards
What are the engines?
- GE CF6-80C2B6?
In AUTO when does the standby engine indicator automatically display?
- AC power is lost or:
- EICAS failed
Explain EEC minimum IDLE mode
- Lower thrust
- Most phases of flight
- All ground Operations
Explain approach Idle
- Higher Thrust
Automatically selects when:
- Anti-ice on or:
- Flaps at LDG Flap until 5 sec after touchdown
Explain EEC NORMAL MODE
- Compares commanded N1 to actual N1 and adjusts fuel flow to change engine speed until actual N1 is the same as commanded N1
- Over speed, Over boost protection when thrust levers fully forward
Explain EEC ALTERNATE MODE
- Schedules N1 as a function of thrust lever postion
- Alternate mode N1 reference/target values are computed by the TMC
- Alternte mode provides equal or greater thrust for same thrust lever position
- Thrust protection not provided, overboost can occur, EN LIM PROT displays if trust lever postion commands greater than reference N1
- N1 & N2 red line proctection still available
- SOFT
- When the EEC automatically switches an engine to the alternate mode and the EEC mode switch remains in NORM
- At a fixed thrust lever position, thrust does not change
- HARD
- When ALTN is manually selected on an EEC mode switch, that engine is switched to the hard alternate mode
- Thrust may change to set the commanded N1 when ALTN is manually selected
What happens when the fuel control switch is moved to cutoff?
- Spar & Eng valves close
What does the N2 magenta bug indicate?
- Min N2 to put fuel in (Fuel on bug)
When can an inflight windmill start be used?
- When there is no x-bleed display above the N2 indicator
What will display if a X BLD start should be initiated in flight?
- X BLD above N2 and a fuel on bug
- Displayed when airspeed is lower than that required for a windmill start
What does the Thrust mode selector use?
- Configuration
- Engine
- Operation
- Conditions
What rotor drives the engine accessory gear box?
- N2 rotor
When are the secondary Engine indications automatically display?
- Initially receiving electrical power or:
- A secondary engine parameter is exceeded
What gauges have a caution range and what happens?
- Oil temp & Oil press
- Have caution ranges displayed by Amber bands
- If reach the range the digital readout, readout boxes and pointer all change colour to Amber.
What gauges have operating Limits?
- N1, EGT, N2, Oil press & Oil temp have operating limits indicated by red lines
- If one of these indications reaches the red line the digital readout, box and pointer all change colour to RED
What does EGT guage have?
- Maximum continuous, indicated by an amber line
- If reaches this the box, dial & pointer all turn AMBER
- Inhibited during takeoff and go around for 5 minutes
- Also has Max takeoff limit indicated by a red line
- All turns red if reached
What does N1 limit do?
- Indicated by an Amber line on the dial but does not change colour when max N1 is reached
What is the Derate for Takeoff 1 & 2?
- Takeoff 1 (300)- 95%. (300ER,F)- 90%Takeoff 2 (300)-85%. (300ER,F)- 80%
When will Derates thrust remain until?
- ABV 10,000ft Derates thrust gradually changes to reach full CLB thrust by:
- (300) 12,000ft. The 1 or 2 annunciation disappears from the display by 12,500ft
- (300ER,F) 30,000ft. The 1 annunciation disappears by 30,500ft The 2 annunciation remains until either flaps are extended or GA
What are the engines covered for by the EEC in normal mode?
- N1, N2 protection but no EGT protection
EEC Soft mode
- Auto switches to this mode when switches in NORM
- Thrust will be fixed and will not change
Hard Alternate mode
- ALTN is manually selected on the EEC mode switch
- Reference, target and maximum commanded N1 values are displayed on the N1 indication
What protection is provided in the ALTN modes
- Thrust protection not provided and maximum rated thrust is reached at a thrust lever position less than full forward. As a result thrust overboost can occur at full forward thrust lever positions
- N1,N2 redline protection is still available in the ALTN control mode.
What are the two idle speeds and when are they selected
- Minimum Idle: lower thrust setting used for for ground ops and all stages of flight except approach & landing
- Approach Idle: selected whenever the higher idle setting is required for proper system operation.EEC AUTOMATICALLY SELECTS IDLE SPEEDS
What is displayed on the EGT during start
Maximum start line limit, displayed until engine is stable
Starter duty cycle
- Five minutes on, followed by 30 seconds off per minute on
When does the in flight start envelope display on the primary display and what does it indicate?
- ENG is not running in flight
- Respective Fire SW not pulled
- Both EICAS prim & sec are selected
- Displays closest starting FL and two descending FL’s at 2000ft intervals as well as air speed range
- X-BLD displayed above N2 and fuel on bug displayed if airspeed below windmilling start speed
Auto relight?
- In air or on ground, automatic relight feature is enabled if N2 drops below idle SPD
- EEC energizes both ignition systems
When do the Engine and Spar valves open?
When the fuel CONT switch is in the RUN position and the ENG fire SW is in.
Where is fuel flow measured from?
After passing through the engine fuel valve.
Where is the oil temp measured from?
After leaving the scavenge pump, prior to entering the second filter.
Is there a minimum oil quantity limit?
There’s is no min oil quantity limit, (no amber or red line)
What happens when the reverses are pulled aft to the interlock position?
- A/T disengages
- Auto speed brakes deploy
Is oil quantity displayed in litres or quarts?
Quarts
When should the engine start selector move from GND to AUTO during an engine start?
50% N2
With the ENG start selectors in AUTO when will the selected igniters continuously operate?
With slats extended or ENG anti ice on
Is there a time limit to continuous ignition or flight ignition?
No time limit
What is the purpose of selecting FLT on the ENG start selectors following a loss of dual engine failure?
FADEC- Auto relight which will operate both igniters when N2 drops below idle speed.
When is the red EGT start limit line of 750degrees displayed when on the ground?
Fuel control SW is in cut off position, remains displayed when fuel CONT SW is moved to RUN until the engine is stabilised at idle (FADEC- 10sec after N2 reaches 60%) (NON-FADEC- 5 sec after N2 reaches 60%)
What happens when the Fuel CONT SW is positioned to RUN?
Opens ENG & SPAR valvesActivates selected igniters
Can autothrottle sill remain engaged in EEC hard and soft modes?
Yes
What does pulling up the reversers do?
- Disengages Autothrottle
- Deploys speed brakes if in down position
