Powerplant

Question 1

Explain the START sequence of the AE3007.

Answer 1

After selecting START, verify N2 rotation within 10 seconds and oil pressure rise. At approximately 14% N2, verify ignition on. At approximately 28.5% N2 or 12 seconds after ignition is activated, verify FF and then monitor ITT for light-off (within 10 seconds of FF) and verify N1 rotation. FF and ITT indications should increase at approximately 31.5% N2. Monitor ITT, N2 and oil pressure throughout the start so as not to exceed normal parameters.

Question 2

How quickly should the START/STOP selector be moved from the STOP position to the START position?

Answer 2

When positioning the START/STOP selector from the STOP position to the START position, pause 2 seconds in the RUN position and prior to selecting the START.

Question 3

Why would the pause of 2 second on the RUN position should occur prior to selecting START, should happen?

Answer 3

Because quickly moving the knob from STOP to START without the 2 second pause will cause the FADEC to mistakenly interpret a shutdown command.

Question 4

How is light-off recognized during engine starts?

Answer 4

When the digital number on the ITT indicator increases.

Question 5

When should ignition be placed in ON?

Answer 5

If standing water, ice, slush or snow is present on the runway for takeoff; Prior to engine start for the first flight of the day when the temperature is below 10*C or if the engine is cold soaked or as directed by the QRH.

Question 6

What are the minimum oil quantities needed for takeoff?

Answer 6

8 qts off the hub, 7 qts off the out station for engine start. Minimum oil quantity for takeoff is 6 Qts.

Question 7

When should the engine start be aborted?

Answer 7

No light-off within 10seconds after first FF indication. If ITT approaches start limits. N2 decreases or remains steady for 30 seconds. No N2 rotation after start command and 10 seconds. Any unusual noise or vibration. Abnormal condition on engine instruments. visible flame out the exhaust pipe. Oil pressure below 34 psi after engine has stabilized.

Question 8

What are the mandatory EICAS messages?

Answer 8

E1-2 ATTCS NO MARGN
E1-2 LOW N1
ENG 1-2 REV DISAGREE
ENG 1-2 REV FAIL
ICE COND-A/I INOP

Question 9

Are the mandatory EICAS messages inhibited during takeoff.

Answer 9

Yes; all of them are inhibited during takeoff. The inhibition logic is activated when the airplane passes V1 - 15 knots.

Question 10

What are the indications for severe engine damage?

Answer 10

No N1 rotation, high ITT, high vibration, high oil temperature, oil low quantity, high oil pressure, EICAS message “E1 (2) FIRE DET FAIL”, smoke, abnormal noise or vibration.

Question 11

Which is the only non selectable thrust rating on the EMB145XR?

Answer 11

TO-RSV

Question 12

What are the thrust ratings available for the XR using the T/O data settings?

Answer 12

ALT-TO, TO and E-TO.

Question 13

Where can the engine oil quantity be monitored?

Answer 13

On the MFD TO page.

Question 14

What are the components powered by the accessory gear box?

Answer 14

2 Engine driven generators
Oil pump
Hydraulic pump

Question 15

What happens if a thrust reverser deploys in flight?

Answer 15

The associated FADEC reduces the engine thrust to idle, however the associated thrust lever will not move.

Question 16

What happens to the engine if the associated FADEC in control fails?

Answer 16

The other FADEC take over control of the engine.

Question 17

What happens when both FADEC’s off the same engine fail simultaneously?

Answer 17

Engine will shut-down.

Question 18

What it means to “reset” the FADEC?

Answer 18

During start the FADEC may detect or develop undetected faults. This become inactive faults. By momentarily resetting the FADEC we clear those inactive faults. If a particular fault persist after RESET command, it is not cleared. RESET doesn’t mean electrical power interruption to the FADEC.

Question 19

What powers the igniters?

Answer 19

Primary Magnet Alternator. PMA at 10%.

Question 20

What is the power source of the FADEC?

Answer 20

The FADEC is powered by the airplane power up to 50% N2. At that point the PMA is the primary power source provider for the FADEC. If the PMA fails, the airplane electrical system will provide power to the FADEC.

Question 21

How many oil sumps exist on the AE3007?

Answer 21

Four oil sumps.

Question 22

What happens when the gear is lowered bellow 15,000’?

Answer 22

The FADEC logic will select the highest select able thrust rating. If the TL is pass the detend, TO-RSV will be selected on the A1P but the A1E will still command E-TO thrust.