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 72-31-00
 ALL  ú ú C02 Page 580I ú Nov 12/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
C. Access
 (1)  Location Zones
 506 No. 1 Engine
 606 No. 2 Engine

 D. Prepare for the Procedures.
 S 825-050-C00
 (1)  Do the steps that follow for the analyzer and the signal
 conditioner.

 NOTE: Refer to the operation instruction manual.
____
 (a)  
Do the warm-up.

 (b)  
Do a calibration check.

 (c)  
Correctly set the controls.

 E. Use the First Procedure to Make the Matrix.
 S 845-051-C00
 (1)  Do the steps to prepare for the trim balance procedure that were given in the task: Fan Trim Balance Procedure (Analyzer Method).
 S 975-052-C00
 CAUTION: DO NOT USE RATCHET TOOLS WHEN YOU REMOVE OR INSTALL BALANCE
_______ SCREWS. DO NOT HIT THE FAN BLADES WITH TOOLS. IF THE TOOLS HIT THE FAN BLADES, CRACKS CAN OCCUR ON THE BLADES.
 (2)  With an engine that has low vibration indications (less than 2.0 mils on both the No. 1 bearing and TRF sensors), do the steps that follow to calculate a matrix.
 (a)  
Do the steps for the trim balance procedure as given in this task: Fan Trim balance Procedure (Analyzer Method).

 (b)  
Install the recommended balancing weights from the one-shot plot original run worksheet.

 (c)  
Do the steps for the vectorial analysis procedure.

 (d)  
Do the calculation as given in the vectorial analysis procedure to find the sensitivities and phase lags for the engine uner test.

 (e)  
Write the data for the one-shot plot coefficient matrix (Fig. 525).

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 72-31-00
 ALL  ú ú C02 Page 580J ú Nov 12/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
(f)  
Use Figure 525 as a one-shot plot coefficient matrix for other engines with this configuration to be tested at a later date.

 (g)  
To increase the accuracy of the coefficient, average the values you get every time you trim balance an engine.

 (h)  
Find the static takeoff %N1 as follows. 1) Find and make a record 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.
 a)  Get the ambient air temperature (outside air temperature (OAT)) in the shade of the wheel well of the nose gear.
 b)  Get the barometric pressure.
 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.
 2)  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.
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