ATA 70-80 Engine Flashcards
In which manual is ATA chapter 70 located?
AMM PT 2
What is ATA 70 used for?
Provides a review for process and practices used on Leap Engine
Summarize the procedure for opening engine fan cowlings.
Retract and lock out leading edge flaps/slats, push the latch to trigger to release a fan cowl latch, rotate the latch to unhook the latch from the other side of the fan cowl.
Which of the engine cowlings, when open, will not be damaged if the leading
edge devices are extended?
Inboard Fan Cowl-Mid Open
Outboard Fan Cowl- Mid or Full open
Outboard TR-Deployed
Describe the engine configuration: Compressors/stages, Turbines/stages.
LPC: 4-stage compressor
HPC: 10-stage compressor
HPT: 2-stage turbine
LPT: 5-stage turbine
There are 5 main bearings that support the N1 and N2 shafts located in 3 oil sumps from front to rear of each engine, what type of
bearing is each of them?
A Sump: 2 ball bearings (2B and 3B) and 2 roller bearings (1R and 3R).
B Sump: 1 roller bearing (number 4)
C Sump: 1 roller bearing (number 5)
How is fan trim balance provided?
N1 speed sensor
List the components attached to the front and rear side of the accessory gearbox.
Front side: N2 speed Sensor, Handcranking drive pad, Oil Temperature sensor, Starter, IDG, Hydraulic pump
Rear Side: Main Fuel Pump, Lubrication unit with oil filter cartridge and magnetic scavenge screen plugs and permanent magnetic alternators.
What is the purpose of the servo fuel heater?
Heats up fuel that goes to the SCU and cools scavenge oil
What is the purpose of the Split Control Unit?
To send servo fuel pressure to move the actuator in the LPTACC valve
Describe how the EEC can be powered.
Either one of the two channels (Channel A and Channel B)
What does the CONTROL light on the P5 aft Engine Control Panel indicate if
illuminated?
A no-dispatch fault has occurred
How does the EEC get the engine thrust rating?
Data entry plug
What is the purpose of the ignition selector switch on the engine start panel?
Allows you to choose which ignition exciter you want to give power to. (Left, Right, or Both)
Where are the autothrottle switch packs located?
Under the flight deck
What is ATA 70 about?
A review and reminder of the processes used
What does the Engine ID plug give?
Selected thrust rating data to the electronic engine controls
When is it only allowed to go near an engine in operation?
Engine is at idle
You can speak with people in the flight compartment
For additional safety wear a safety harness when the engine is in operation
The SDOS and the HOR together lock the fan cowl open for safety True or False?
True
How many Hold open rods(HOR) are there?
- (1 for each fan cowl)
The permanent magnet alternator supplies power to the EEC’s at what N2 speed?
> 8.5%
What kind of engine is the LEAP engine?
High bypass, dual rotor, axial flow turbofan engine.
What does the N2 shaft turn?
The AGB(Accessory Gearbox)
What does the balance procedure for the fan blades use?
Different weight balancing screws installed in the platform front shroud under the spinner.
What controls the engine idle speed?
EEC
Are there any mechanical adjustments for idle speed?
No
Where is the fuel pump located?
AFT side of the AGB.
What inputs does EEC channel A receive?
AC transfer bus power, PMA power, AC standby bus power
What happens if the pressure difference becomes too large?
A filter bypass light comes on, this light is on the P5 fuel control overhead panel
Where are the igniters located?
The left ignition igniter is on the left side of the combustor near the 6:00 o’clock position. The right one is on the right side of the combustor at the 5:00 o’clock position
How many ignition selector switches are there?
3
What does the HPTACC system control?
Cooling air flow to the external parts of the HPT case. This cooling air adjust the clearance between the HPT shrouds and rotor blades.
What does the LPTACC system control and do?
Cooling air flow to the external parts of the LPT case. Keeps the clearance between the LPT shrouds and rotor blades small
When do the VSV’s and IGV’s open?
When the N2 increases(more air more open less air less open)
Where is the autothrottle assembly?
Underneath the flight deck
Where is the N1 speed sensor installed?
A guide tube in a strut at the 5’00 o’clock position of the fan hub.
How many connectors does the N1 sensor have?
- One for the DPCs, one for EEC channel A and one is for EEC channel B
Where does engine exceedance data show up?
Engine exceedance data maintenance pages
How many actuators does each T/R half have?
- The top one has lock mechanism and LVDT, the middle one has only a locking mechanism and the bottom one is non-locking.
Where does vibration data go?
From the DPC to the Display Unit, Network File Server of the onboard network system and the Digital Flight Data Acquisition Unit.
The outboard actuator is up sized to allow the outboard thrust reverser to open to a locked position of what?
55 degrees
How many engine cowl latches are there?
9
What does the TR system use?
Electrically controlled and hydraulically powered
What connects to the bottom hydraulic actuator on each T/R half?
A sync lock
How does the sync lock work during normal operation?
It will energize to unlock.
Each module has a handle that ____________
Allows the T/R to be deactivated for maintenance
The manual deactivation panel has a hole for ___________
Manual deactivation pin
Where does the oil from the tank go to?
A lubrication unit through an internal anti-leak check valve.
Where is the engine oil tank?
Right Hand side of the fan case.
Where is the oil level sight gauge located?
Front of the oil tank
Where does the oil go to after the previous areas?
Six scavenge lines with 4 magnetic plugs
Does the oil supply pump control the output pressure?
No, the oil pressure only changes when the engine speed changes.
Where is the anti-leak valve?
In the lubrication unit
A latching solenoid holds the start switch in the GRD position until __________________?
EEC commands the solenoid to release
How does the EEC command the solenoid to release?
Engine starter cutout discrete command
How is the starter controlled?
EEC
When does the start valve close and remove pneumatic power from the starter?
55% N2
When does the starter receive a continuous flow of oil and from where?
When the engine turns and from the AGB
What are two types of engine airflow?
Engine cooling and compressor airflow
Does engine exceedance appear during flight?
No, only on ground when the engines have stopped running.
When do you check and if required service engine oil?
Not less than 5 minutes and not more than 60 minutes after engine shutdown
Where does the air starter get lubrication from?
Continuous supply from the gearbox
What does the T/R system use to move the translating sleeves?
Hydraulic actuators
The sync lock energizes to__________?
Unlock
What angle should you approach the engine at?
45 degrees
What are the balance procedures for the fan blades
different weight balancing screws installed in the platform front shroud underneath the spinner
Thrust resolver is located where?
Autothrottle assembly under the flight deck
How many oil line pumps are there?
7
