PROCEDURE 4: CORRECTING SHAFT BALANCE

TASK 10 - ISOLATING IRREGULAR/UNUSUAL VIBRATIONS

TM-1-6625-724-13P Aviation Vibration Analyzer Manual
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0069 00 TM 1-6625-724-13&P 0069 00-42 PROCEDURE 4: CORRECTING SHAFT BALANCE a. After the measurement is completed, press DO on Finish, then press DO on Diagnostics. If measurements are within specified limits, press QUIT to Main Menu. Proceed to step “d”. b. If measured values exceed manufacturer's desired levels on engine 2, press the DO key to enter the DIAGS mode. Perform all corrections displayed on the Corrections screen. If alterations of these corrective actions are desired, use the EDIT ADJUSTABLES option and turn off adjustment not wanted. Do not use a partial set of the adjustments. c. After No. 2 engine corrections are installed or recorded, press QUIT two times to return to Main Menu. d. Use cursor keys to highlight Flight Plan. Press DO. e. Use cursor keys to highlight ENG1. Press DO. f. Use cursor keys to highlight Flight ID. Press DO two times. g. Run diagnostics on No. 1 engine by pressing F3. If measurements are within specified limits, press QUIT to Main Menu. h. If measured values exceed manufacturer's desired levels, press the DO key to enter the DIAGS mode. Perform all corrections displayed on the Corrections screen. If alterations of these corrective actions are desired, use the EDIT ADJUSTABLES option and turn off adjustments not wanted. Do not use a partial set of the adjustments. i. Repeat test to verify that vibration levels are within specifications. j. Return to a flight-ready condition. NOTE When balancing an aircraft with the balance bolt configuration, the following guidelines must be observed when installing balance washers: AN960-416 and AN960-416L washers are used as balance washers. Balance washers are installed under the nut on the bolts that connect the engine output shaft to the flexible coupling. See figure 22. The maximum number of balance washers that can be added to any one balance bolt is two. Do not remove bolts securing flexible coupling to output shaft. If balance washers must be added, remove nut only. Only one nut should be removed at any time. If balance washers are added or removed on two different balance bolts, the nut on the first balance bolt adjusted must be installed and torqued before removing next nut. Balance bolts are subject to the same torque values (130-140 inch-pounds) and torque stabilization procedures as the balance studs. Refer to TM 1-1520-237-23 for the proper torque stabilization procedures.

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