72-31-00
ALL ú ú C01 Page 525 ú Mar 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
PO7
* MOMENT WEIGHT RESULT (THE MOMENT WEIGHT OF EACH SCREW MINUS THE MOMENT WEIGHT OF SCREW PO7)
S-M56-MM-0982-(1)-01-B Balance Screw Specifications Figure 503
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72-31-00
ALL ú
ú C01 Page 526
ú Mar 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
CAUTION: MAKE SURE THAT YOU PUT COVERS ON ALL OF THE LOWER
_______ HALF OF THE INLET COWL SURFACE. ALSO MAKE SURE THAT THE EDGES OF THE MATS TOUCH OR ARE ATTACHED WITH SOME TAPE. IF THE EDGES ARE NOT, THEN THE TOOLS OR PARTS CAN FALL AND CAUSE DAMAGE TO THE INLET COWL SURFACE.
1) Use tape to put the protective mats on the inner lower half of the inlet cowl.
2) Make a record of the type and location of the balance screws that are installed radially in the spinner rear cone (Fig. 502 and 503).
NOTE: When you use the 856A2636 analyzer, you must
____ calculate the weight of the original balance screws installed on the spinner rear cone to program the analyzer.
3) Remove the protective mats and all other remaining unwanted material from the inlet cowl.
(b)
If you did not do this before, during trouble-shooting (AMM 71-00-47/101), examine the AVM system to find the high vibration source and the related engine speed (AMM 77-31-00/001).
(c)
Find and make a record of the conditions that follow:
CAUTION: DO NOT USE THE AIRPLANE TOTAL TEMPERATURE INDICATION
_______ TO GET THE AMBIENT AIR TEMPERATURE. ALSO, MAKE SURE THAT YOU GET THE LOCAL BAROMETRIC PRESSURE (NOT CORRECTED TO SEA LEVEL) FROM THE CONTROL TOWER. THIS CAN HELP PREVENT AN INCORRECT TRIM TARGET SELECTION.
DO NOT USE A MERCURY THERMOMETER ON THE AIRPLANE. MERCURY FROM A BROKEN THERMOMETER CAN CAUSE DAMAGE TO 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.
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ALL ú ú C04 Page 527 ú Jul 15/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
CAUTION: DO NOT OPERATE THE 3-B1 ENGINES AT 3B-2 TAKEOFF POWER FOR
_______ OTHER PROCEDURES. 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 higher 3B-2 engine static takeoff targets if the condition that follows occurs. It is permitted if the usual 3-B1 takeoff targets do not let the engine operate 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.
(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.
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