THE AIRPLANE COMPONENTS.
1) Get the ambient air temperature (outside air temperature (OAT)) in the shade of the wheel well of the nose gear. 2) Get the barometric pressure.
CAUTION: DO NOT OPERATE THE 3-B1 ENGINES AT 3B-2 TAKEOFF POWER FOR
_______ ANY OTHER PROCEDURE. THE OPERATION OF THE 3-B1 ENGINES AT 3B-2 TAKEOFF POWER IS APPROVED FOR THIS PROCEDURE ONLY. THE CONTINUED OPERATION OF THE 3-B1 ENGINES AT THE 3B-2 TAKEOFF POWER WILL CAUSE ENGINE PERFORMANCE DETERIORATION.
(d) With the temperature and barometric pressure records, calculate and make a record of the static takeoff target %N1 (AMM 71-00-01/201).
NOTE: When you do the trim balance procedure on the 3-B1
____ engine, it is permitted to use the higher static takeoff targets of the 3B-2 engine if this condition occurs. It is permitted if the usual 3-B1 takeoff targets do not allow the engine operation at or near the power at which the vibration problem occurred.
WARNING: MAKE SURE THAT THE BRAKES ARE SUFFICIENT AND THAT THE
_______ ADDED EXHAUST (JET BLAST) WILL NOT CAUSE PROBLEMS. BRAKES THAT ARE NOT SUFFICIENT AND TOO MUCH EXHAUST CAN CAUSE DAMAGE TO EQUIPMENT AND INJURIES TO PERSONS.
CAUTION: MAKE SURE YOU OBEY THE WIND VELOCITY AND DIRECTION LIMITS.
_______ IF YOU DO NOT OBEY THE LIMITS, FAN TIP STALL CAN OCCUR.
(e)
Start the engine (AMM 71-00-00/201) and operate it at minimum power for 3 minutes until the engine is stable.
(f)
Increase the speed of the engine slowly, during a time of 20-30 seconds, until the speed is 80 |2 %N1 rpm.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
72-31-00
ALL ú ú C12 Page 532 ú Nov 12/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
(g) Continue to operate the engine at a speed of 80 |2 %N1 rpm for a minimum of 5 minutes to make the temperature of the engine stable.
NOTE: The time to make the temperature stable can be decreased
____ to a minimum of 3 minutes if the engine was operated less than 15 minutes before this procedure. This 3 minute time is not necessary if the trim balance procedure is started less than 5 minutes after the engine was operated at high power and was not stopped.
(h) If the analyzer equipment only has sensitivity switch positions of 20 and 100 pC/g, do the steps that follow. 1) Initially, set the sensitivity selector to the 100 pC/g
position. 2) If the vibration level indication is less than 4 mils DA (8
__________ mils actual), change the position of the sensitivity switch to 20 pC/g.
NOTE: If the 20 pC/g position is used, the vibration level
____ indications that are more than 20 mils DA are not satisfactorily accurate.
3) Multiply the indication that shows on the indicator by a
number, as follows, to get the correct vibration level.
NOTE: The sensitivity switch for channel 1, which is
____ connected to the 50 pC/g TRF sensor, can only be set to 20 or 100 pC/g.
a) When the switch is set on 100 pC/g, multiply the indication that shows by 2 to get the correct vibration level.
Mils DA, corrected = Mils DA shown x 2
b) When the switch is set on 20 pC/g, multiply the indication that shows by 0.4 to get the correct vibration level.
Mils DA, corrected = Mils DA shown x 0.4
CAUTION: DO NOT OPERATE THE ENGINE AT TAKEOFF POWER FOR MORE THAN 5
_______ MINUTES. IF YOU OPERATE THE ENGINE AT TAKEOFF POWER FOR MORE THAN 5 MINUTES, YOU CAN CAUSE DETERIORATION OF THE ENGINE.
(i)
Increase the speed of the engine slowly to the correct takeoff target %N1.
(j)
Decrease the speed of the engine slowly and continuously to the subsequent lower N1 speed as shown in figure 504. 1) Monitor the FAN and TRF vibrations during the deceleration.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
中國航空網 www.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：737-300 400 500 AMM 飛機維護手冊 ENGINE 發動機 1(88)
