Engines (GE) Flashcards
What parameters are monitored during autostart?
EGT, N2 andand other parameters until engine reaches idle speed.
Can the engines be manually started?
No
For what conditions will the autostart NOT attempt a second start?
- Loss of both starters
- No N1 rotation
- No oil pressure rise
How many start attempts are made for an in flight start?
No limit in the air.
How many attempts with the autostart will the system make on the ground?
3 start attempts.
What two modes does the EEC provide?
Normal & Alternate
What protection is lost when the EEC is in alternate mode?
Thrust protection. Thrust overboost can occur with the thrust levers in the full forward position.
When do the EEC’s set approach idle in flight?
- Flaps commanded to 25 or greater, or
- Landing gear selected down
What mark on the N2 gauge indicates the RPM where the engine can maintain self-sustained running operation?
Green mark, Idle target indication
For how long is the “RUNNING” indication displayed?
30 seconds after engine reaches idle.
What condition creates the AUTORELIGHT mode?
When the EEC is in auto-relight mode.
Activated whenever an engine is at or below idle with the FUEL CONTROL switch in RUN.
During an in-flight start, with speed below that for a windmilling start, describe the indication that is displayed if a starter assist is required?
“X-START” displayed in magenta below N2 if airspeed is below that for a windmilling start.
What does the fuel control switch control?
Fuel control switch controls the spar fuel valve.
It also arms the engine fuel valve and igniters for the EEC to operate.
If the overspeed protection fails, what will the EEC’s command the engines to do?
EEC will command fuel shut off to that engine.
What alert is displayed on the HUD(green) and PFD(red) if actual thrust is less than commanded?
What is the airspeed range for this alert to be active?
“ENG FAIL”
Between 65kts and 6kts prior to V1.
Also master warning and voice “Engine Fail”
What environmental factors causes thrust ramping to activate?
Crosswind, especially during high altitude and high ambient temperatures that require maximum thrust settings.
With thrust ramping active, what is the latest airspeed maximum takeoff thrust will be set?
65 KIAS
What protection does Thrust Control Malfunction Accommodation provide for?
Idle thrust asymmetry conditions on the ground.
What system provides Thrust Control Malfunction Accommodation, and how does it work?
Provided by the EEC. Commands shutdown of affected engine when:
- Airplane on the ground, and
- Thrust lever is at idle
- Engine above idle speed and not decelerating normally.
Is TAP available available in both EEC modes?
Thrust Asymmetry Protection available in EEC normal or alternate modes.
With TAP active, will there be a decrease in climb performance?
No. Any decreased climb performance will be due to mismanaged speed, not TAP.
When TAP is active, what indication will be displayed on EICAS?
As TAP reduces thrust, the maximum and commanded N1 tics move down to the reduced TAP thrust value. The reference/target N1 and thrust levers do NOT move.
Where is the reverser indication displayed?
What does amber and green REV indicate?
Thrust reverser indication displayed over N1 gauges on EICAS.
Amber REV indicates reverser in transit, green REV indicates reverser deployed.
What is the indication of TAP inoperative?
EICAS “THRUST ASYM PROT”
How is the reference N1 displayed?
Displayed with a green/magenta chevron symbol on the N1 gauge.
How and where is the thrust reference mode displayed?
Displayed in green above and between N1 gauges on EICAS display.
Why should the thrust levers be moved to the mid positions before selecting Alternate Mode on the EEC?
To prevent overboost. Alternate mode will provide same or higher thrust for the same thrust lever position.
What powers the thrust reversers?
Left and right hydraulic systems.
What indication is there on EICAS of EEC alternate mode?
EICAS “ENG EEC MODE L/R”
How can an exceeded EGT indication be recalled?
By pressing the CNC/RCL switch.
Which engine is installed and what is the thrust rating?
GEnx-1B64
63.800lbs thrust
When is the EGT max continuous limit indication inhibited and for how long?
Inhibited on takeoff and go-around.
5 minute inhibit, 10 minutes for S/E operations.
What is the indication of an N1, N2 or EGT exceedance?
If indication reaches red line operating limit,
digital readout, dial, box & pointer changes to red.
The box will remain red after back within operating limits. Can be cancelled/recalled.
What powers the EEC’s?
During engine start, airplane power. After engine start, PMA’s.
What is the indication when thrust protection is active?
EICAS “ENG RPM LIMITED”
What is the Transient Bleed System?
System which unloads the compressor during engine acceleration to increase engine stall margin.
What effect does a closed engine TBV have on thrust reverser operation?
Thrust reverser inhibited with TBV closed. If already deployed, limited to reverse idle. EICAS “ENG REV LIMITED”.
When is the engine vibration indicated in reverse video?
When above 4.0
What conditions will the autostart system try to correct for?
- Hot start
- Hung start
- Wet start
- Compressor stall
- High residual EGT
- Loss of one starter
- Start time exceeds starter duty cycle time
