Engines and APU Flashcards
Engine model
GE-90-110BIL
Engine rated thrust
110,760lbs
How many auto start attempts
3
Motoring period between autostart attempts
4 seconds motoring after starts 1 and 2
30 seconds motoring after start 3
Significant difference on auto start 3 compared to previous 2
Fuel flow is adjusted
Auto start will abort a start for any of the following on the ground.
(x8 answers, excluding oil temp and pressure)
- Hot start
- Hung start
- no EGT rise
- Compressor stall
- Starter shaft failure
- no N1 rotation
- Insufficient air pressure for start
- Start time exceeds the starter duty cycle
*N710GT does not monitor oil temperature and pressure.
(SHHE SNIS)
Auto start will abort a start for any of the following in flight
- Preset EGT limit exceeded (Set between start and takeoff limit)
- Hung start
How many air starts completed
Continuous without faults or pilot intervention
APU starter cutout speed
50%
What will cause the APU to automatically start
Both AC transfer buses lose power
Vibration limit and action
No published limits
Recommended to reduce airspeed and descend
Secondary engine indications automatically display when.
6x answers
- The unit initially recieves power
- FUEL CONTROL switch moved to CUTOFF in flight
- Engine fire switch is pulled in flight
- FUEL FLOW L,R message is displayed
- A secondary engine parameter is exceeded
- Engine N2 RPM is below idle in flight
EEC normal mode protections
Overspeed N1 and N2 and Overboost
EEC alternate mode protections
Overspeed, some overboost
Indications of a SOFT change of EEC to alternate mode
NORM and ALTN lights on the EEC mode panel illuminated
Indications of a HARD change to EEC alternate mode
NORM light extinguished and ALTN light illuminated
Approach idle is selection under normal conditions
2x answers
- Engine Anti Icing ON
- Flaps 25 or greater
Approach idle is selected under non normal conditions
- One Hydraulic system air-demand pump is inoperative and the flaps are out of UP.
- The Opposite engine bleed air valve is closed
How many igniters used for each autostart sequence on ground
- 1 igniter for first start
- 2 igniter for remaining 2 auto starts
How many igniters used for each autostart sequence in flight
Always 2 igniters in flight
What powers the igniters
Main AC is the normal source, standby AC provides backup
When will the EEC attempt an auto-relight
- A rapid decrease in N2
- N2 RPM is below idle
How long is fuel shut off for, if the EEC detects conditions for auto-relight
1 second
How is flameout for an Auto relight detected.
x2 Answers
- Rapid decrease of N2
or - N2 below idle RPM
How many igniters for inflight starts
2
When is inflight start envelope information displayed
- Engine is not running (N2 spool below idle RPM)
- Engine has been shutdown but the fire switch has NOT been pulled
X-BLD indication is displayed if N2 is __________ and if airspeed is ___________ recommended by envelope for an air start
Above
Below
What will cause the auto start NOT to complete a second or third start.
x5 answers
- No N1 rotation
- Insufficient air pressure
- Starter shaft failure
- EGT exceeds start limit line
- Start time exceeds the starter duty cycle
N710GT
Continuous ignition under what circumstances.
2x answers
- The flap lever is out of UP, or
- Engine anti ice is ON
FCOM 2 7.20.11
Minimum oil quantity
No published minimum
What will cause the EGT start limit to display
- Fuel Control switch CUTOFF
- N2 below idle
Engine start selector does what when selected START
Opens the Start Valve
EEC sets thrust using what engine parameter in both NORM and ALTN modes
N1%
Engine Fuel Control switch does what selected to RUN
Opens the Fuel Spar Valve
When the fuel control switch is selected to RUN what does the EEC do
Opens the Fuel Valve
Energizes the igniters
Low oil quantity indications
“LO” on the lower DU next to quantity indicator on secondary engine indications
What can control the engine Fuel Valve
The EEC
Engine Fire Switch
What can control the Fuel Spar Valve
Fuel Control switch
Engine Fire Switch
When will secondary engine indications display automatically
6x Answers
- Displays initially powered
- Fuel Control switch CUTOFF in flight
- Engine Fire switch pulled in flight
- FUEL FLOW ENG L/R on EICAS
- Secondary engine parameter exceed
- N2 below idle in flight
Time critical ENG FAIL is displayed on the PFD when
- The thrust is less than commanded thrust on TAKEOFF and,
- Airspeed is greater than 65kts but less than 6kts below V1.
Caution message ENG FAIL L/R displays if_______________ and remains until the engine recovers or ____________________
- The engine unexpectedly decelerates to less than idle speed.
- Fuel Control switch is moved to CUTOFF
EICAS caution message ENG THRUST L/R displays if
- Actual thrust is significantly less than commanded thrust
- Actual thrust is not increasing to commanded thrust
- Airspeed is V1-6kts or greater
When does the EEC inhibit reverser thrust isolation valve and reverser deployment
The aircraft is in flight with the engine running
What happens when thrust reversers are pulled aft to the interlock position
- The auto throttle disengages
- The auto speed brakes deploy regardless of lever position
When can the Reverse Thrust lever be moved aft to the interlock position
If the thrust Lever is idle
APU reasons for auto shut down in attended mode
- APU fire/inlet over temperature
- Overspeed/loss of overspeed protection
- APU Controller failure
- Speed droop
Note EICAS messages for
1. High oil temperature
2. Low oil pressure
3. EGT high
(SPIC) (Same as SPICY)
APU reasons for auto shutdown in unattended mode
- All attended mode reasons
- Generator oil filter approaching bypass
- No Combustion on start
- No acceleration on start
- High oil temperature
- Low oil temperature
- Intake door failure
- EGT high
SPICY ACID
What determines APU attended or unattended mode
The attended mode operates when
1. Either engine is running or starting
2. The aircraft is in flight
Amber EGT indications are inhibited for ____ minutes after takeoff or go around
5
What will selecting the APU selector to OFF do
- Close the APU bleed valve
- Begin APU cooldown period (No published time)
Will an automatic shutdown of the APU commence a cooldown period
No
