Powerplant Flashcards
(40 cards)
List the engine model equipped on the LR? XR?
145LR: AE3007 A1P
145XR: AE3007 A1E
Describe the engine in regards to the compressors and turbines?
The engine is a two spool engine. Has a single stage shrouded fan driven by a 3 stage low pressure turbine. The inner core has a 14 stage compressor driven by a 2 stage high pressure turbine.
What is CVG?
CVG - Compressor Variable Geometry
In the first five stages of the compressor, the stator vanes can change blade angle for better efficiency. Uses fuel pressure from the FMPU to reposition the Stator Vanes.
What items are located on the accessory gear box?
3 pumps, 3 electrical devices, 1 ATS:
Fuel Pump, Oil Pump, Hydraulic Pump
2 electrical engine generators, 1 PMA
1 Air Turbine Starter
How is the accessory gear box connected to the engine?
The accessory gear box is connected through the tower shaft.
Where are the following indications presented:
Engine Oil Quantity
Engine Oil Pressure
Engine Oil Temperature
Engine Oil Quantity - MFD T/O Page
Engine Oil Pressure - EICAS
Engine Oil Temperature - EICAS
What would occur if FADEC A were to fail?
FADEC B would take over control of the engine.
What would occur if both FADEC’s fail?
An engine shutdown would occur. The engine requires at least one FADEC to operate.
Describe the amplified procedure for the MFD System Pages checked with regard to the Takeoff Page during the Before Start Check?
On the takeoff page, verify that the engine oil quantity is sufficient. The minimum oil quantities for engine start are 8 quarts when leaving a hub or 7 quarts when leaving an outstation. The minimum oil quantity for takeoff is 6 quarts.
Contact maintenance if the oil quantity falls below 6 quarts (amber indication) after engine start.
Describe the amplified procedure for setting takeoff data?
To set the takeoff thrust:
• Select the T/O page on the MFD
• On the overhead engine panel, press the STORE push button and observe a cursor arrow appear on the
engine portion of the T/O page across from the T/O MODE. Rotate the SET knob to select the desired takeoff mode.
• Press the STORE button to move the cursor to REF T/O TEMP. Rotate the SET knob to change the indicated temperature to the temperature reported on the ATIS
• Press the STORE button to move the cursor to REF A-ICE. Rotate the SET knob to select anti-icing on or off.
• Press the STORE button once more. If the REF T/O TEMP is within limits the takeoff data will be accepted. If the data is accepted, the T/O DATA entered will turn cyan. If the information is not accepted, the data will remain amber.
Describe the operation of the ignition OFF, AUTO, ON?
OFF:
– Ignitors off
– No fuel introduced on the ground
AUTO:
– FADEC controls respective ignitor
– 1 ignitor during engine start on the ground
– 2 ignitors during engine start in flight
– Both ignitors used during auto- relight (ground or flight)
ON:
– Both ignitors on above 10% N2
When should the igniters be set to ON?
During engine start when the temperature is below 10ºC and the engines have been shut down for more than 90 minutes.
During takeoff if standing water, ice, slush, or snow is present on the runway.
What thrust modes are available for takeoff (pilot selectable?)
ALT-TO, TO, E-TO (XR only)
What five EICAS messages require a mandatory aborted takeoff prior to V1?
Acronym: LARRI
E1 (2) LOW N1 E1 (2) ATTCS NO MRGN ENG 1 (2) REV DISAGREE ENG 1 (2) REV FAIL ICE COND-A/I INOP
Under what conditions will the thrust reversers deploy?
Thrust reverser activation requires:
- Main gear air/ground sensors
- Thrust levers at idle
Maximum reverse thrust additionally requires:
- Nose landing gear air/ground sensors; OR
- 25 knot or greater main wheel speed
What occurs if a thrust reverser deploys in flight?
The FADEC reduces engine thrust to IDLE, however the thrust lever will not actually move.
Under what condition will max thrust reverse be available?
Maximum reverse thrust requires:
- Main gear air/ground sensors
- Thrust levers at idle
- Nose landing gear air/ground sensors; OR
- 25 knot or greater main wheel speed
What are the engine start callouts?
N2 Oil Pressure Ignition Fuel Flow Light Off N1 2, 4, 6, 1/2, Pressure, Temperatures, and Vibrations in the green.
Describe the engine start sequence?
After selecting START, verify N2 rotation within 10 seconds and oil pressure rise. At about 14% N2, verify ignition on (green IGN). At about 28.5% N2 or 12 seconds after ignition, verify fuel flow and then monitor ITT for light off (within 10 seconds of fuel flow). Verify N1 rotation. Fuel flow and ITT indications should increase at about 31.5% N2. Monitor ITT, N2, and oil pressure throughout the start so as not to exceed normal parameters. The engine start cycle is complete at 57% N2.
What are the appropriate actions if the EICAS caution message E1 ATS SOV OPN appears after an engine start?
Allow the engine to run, follow QRH, and contact maintenance.
When positioning the START/STOP selector knob from STOP to START, how long should the knob be paused in the RUN position prior to START?
When positioning the START/STOP selector from STOP to START, pause for 2 seconds in the RUN position prior to selecting START.
How is the light-off recognized during engine start?
Light-off occurs when the digital numbers on the ITT indicator increase.
What are the minimum oil quantities needed?
8 qts to leave hub
7 qts to leave outstation
6 qts for takeoff
If below 6 qts, contact maintenance.
When should the engine start be aborted?
- No light off within 10 seconds after first fuel flow indications (on ground only)
- ITT approaches start limit
- N2 decreases or remains steady for more than 30 seconds
- N2 indicates no rotation up to 10 seconds after the start command.
- Engine instruments indicate abnormal conditions
- Any unusual noise or vibrations
- Flames are visible from the exhaust pipe
- Oil pressure does not reach at least 34 PSI after the engine reaches stabilized IDLE
