_
b The starting fuel flow.
_
c The maximum N2 speed.
_
d The maximum EGT.
_ NOTE : If the fuel flow indication before the light-off was
____ less than 315 pph (143 kg/h), or if the maximum motoring speed was less than 20 percent N2, a corrective action will probably be needed.
F 『 EEFF : ALL E Page A54771-00-00
E E Aug 01/05 ERE
ECES E E 56-5B E E E (3) Overtemperature during Manual Start Procedure
F 『
E C F M E
E E
(a) Do not permit the EGT to go higher than the 725 deg.C (1337 deg.F) limit during starting .
(b) Write the length of time an overtemperature lasts, and temperature reached in the Aircraft Log. See (Ref. TASK 72-00-00-200-008) for unscheduled inspection after engine overtemperature.
(4) Unsatisfactory Starts during the Automatic Start Procedure
(a) The unsatisfactory start conditions found using Auto Start, can be the same as those found using manual start.
(b) The Auto Start system has equipment that collects input on problems. The equipment will automatically resequence the applicable control circuit to correct the unsatisfactory condition.
(c) Usually, the FADEC system is resequenced after a total of 4 cycles. If the problem is not corrected after resequencing, the applicable diagnostic indications will be shown on the flight deck screen.
(d) The FADEC system will automatically do the items that follow when a stall indication or overtemperature occur. It will also do these items if there is a slow start or if a hung start occurs.
1 Stall indication or overtemperature
_ CAUTION : IF THE ENGINE STALLS OR HAS OVERTEMPERATURE AGAIN
_______ AND AGAIN, THE MALFUNCTION MUST BE CORRECTED.
a A stall can be identified by an unusual change in the core
_
speed acceleration.
b It can also be identified by an unusually high EGT increase
_
when compared to core speed.
c An overtemperature happens when the engine EGT is more than
_
725 deg.C (1337 deg.F).
d For either a stall or an overtemperature, the FADEC system
_ will do the items that follow:
- Fuel is shut off for 7 seconds.
- Starter and ignition stay ON.
F 『 EEFF : ALL E Page A54871-00-00
E E Aug 01/05 ERE
ECES E F 『 E C F M E E E E 56-5B E E E
- At the end of the 7 seconds, the fuel is turned back on, but the fuel schedule is reduced 7 percent.
- If another stall or overtemperature occurs, the FADEC system repeats the sequence and reduces the fuel schedule by 7 percent more. The total amount that the fuel schedule has been reduced at this point is 14 percent.
- If a stall or overtemperature occurs a third time, the FADEC system will repeat the sequence and reduce the fuel schedule 7 percent more. The total amount that the fuel schedule has been reduced at this point is 21 percent.
- If a stall or overtemperature occurs a fourth time, the start will automatically be aborted and the applicable message will be indicated on the flight deck screen.
2 Slow start
_
a Low start can be identified by a reduced N2 acceleration
_
rate at 18-19 percent.
b If the acceleration is below the threshold, but all of the
_ other indications are in line with the limits, the start will continue.
c If the acceleration is below the threshold and a stall or
_ overtemperature is indicated, the start will be automatically aborted if in auto start mode.
d During an automatic start, the fuel will not be turned on
_ if the starter air pressure is inadequate to motor the engine at 22 percent N2. The operator will be advised to discontinue the start.
3 Hung start
_
a If engine acceleration ceases and there has been no
_ reduction in the acceleration fuel schedule and there is no stall or overtemperature indication, the operator must abort the start if on manual start mode; if on auto start mode the start will be automaticaly aborted if limits are exceeded. the start will be automatically aborted.
b If engine acceleration ceases and there has been a previous
_ reduction in the acceleration fuel schedule and there is no stall or overtemperature indication, FADEC will automatically increase the acceleration fuel schedule to accomplish acceleration to idle.
F 『 EEFF : ALL E Page A54971-00-00
E E Aug 01/05 ERE
ECES E
F 『
E C F M E
E E
E 56-5B E
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
本文链接地址：A320飞机维护手册 AMM 动力装置 POWER PLANT 1(73)
