Engine Flashcards
Minimum oil pressure?
25 psi
What items are on the accessory gear box?
- Engine driven fuel pump
- IDG
- Air turbine starter (ATS)
- Engine driven hydraulic pump
- Oil pump
- Permanent magnet alternator (PMA)
How is IDG cooled?
Air cooled
What is normal max thrust and reserve thrust?
- 13,800 normal
* 14,200 reserve
Engine type
GE CF34-8E5
How many igniters per engine?
2
How many igniters are energized for starts?
- On ground - 1
* In flight - 2
What happens when the ignition switch is selected to OVRD?
•Both igniters are energized on the ground or in flight
Can the igniters be turned off in flight?
No, FADEC disregards the off command
What controls the engine?
Dual channel FADEC
How is fuel heated?
Fuel/oil heat exchanger
What happens if a thrust reverser inadvertently deploys?
FADEC limits engine thrust to idle
Will turning the start/stop selector to stop alone shut down the engine?
No, thrust lever must be at idle
When does the FADEC command starter cutout during engine starts?
Approximately 50% N2
Does the FADEC provide protection for in flight engine starts?
No protection for hot starts, hung starts, or failure to light off
During engine relights which igniters are energized?
Both igniters
In flight when should the auto relight be manually terminated?
- Engine relight does not occur within 30 seconds
* N2 falls below 7.2%
On the ground when are auto relight attempts automatically terminated?
Engine rpm falls below 52% N2
How are the thrust reversers actuated?
Hydraulically
What provides protection against inadvertent thrust reverser deployment?
FADEC provides an interlock function
When is the FADEC in control channel switched?
On every engine start
What powers the FADEC?
- Above 50% N2 - permanent magnet alternator (PMA)
* Below 50% N2 - aircraft electrical system (28 VDC)
When will the ATTCS automatically command reserve thrust?
Thrust levers in TOGA and: •Difference between N1 values greater than 15% •One engine failure during takeoff •One engine failure during go around •Windshear detected
During engine starts FADEC will not allow fuel flow above what ITT?
120°C
How does the FADEC provide overspeed protection?
When N2 reaches 102% the FADEC commands an engine shutdown
On the ground what protection does the FADEC provide for engine starts?
- Hot starts
- Hung starts
- No light off
During an overspeed when will the FADEC not relight the engine?
After 3 consecutive overspeeds within 30 seconds
Describe N1 spool?
- Single stage fan
* 4 stage LP turbine
Describe N2 spool?
- 10 stage compressor
* 2 stage HP turbine
What does WML mean on the engine indications?
- Windmilling engine
- The FADEC has detected a flame out and is attempting an auto relight
- An assisted start has been commanded
What is the N1 cyan line?
- Minimum N1 required for bleed requirements
* Displays
With one thrust reverser inop what does selecting both reversers to MAX do?
Operating reverser will command idle thrust only
What is the default climb mode on power up?
Climb 1
When will climb 2 become the default?
When selected takeoff thrust is below climb 1
