TABLE 2-1.2.1B. NORMAL VIBRATION LEVELS AT 130 KNOTS

TABLE 2-1.2.1A NORMAL VIBRATION LEVELS AT HOVER

LOW FREQUENCY VIBRATION ISOLATION PROCEDURE (Continued)

TM-55-1520-240-T-1 CH-47D Heilcopter Manual
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TM 55-1520-240-1 2-1.2.1 LOW FREQUENCY VIBRATION ISOLATION PROCEDURE (Continued) 2-1.2.1 1. 2. 3. 4. 5. 6. 7. 8. 9. 10 HAVE PILOT ESTABLISH 130 KNOT CRUISE PROFILE. PLACE VIB PICKUP ON STA 95 BLOCK IN VERTICAL POSITION TUNE BALANCER TO 225, 675, AND 1350 RPM AND RECORD VIBRATION IN IPS. PLACE VIB PICKUP ON STA 95 BLOCK IN LATERAL POSITION. REPEAT STEP 3. PLACE VIB PICKUP ON STA 482 BLOCK IN VERTICAL POSITION. REPEAT STEP 3. PLACE VIB PICKUP ON STA 482 BLOCK IN LATERAL POSITION. REPEAT STEP 3. LAND HELlCOPTER AND ANALYZE RECORDED VIBRATIONS. 1. DUPLICATE AIRCRAFT CONFIGURATION WHEN VIBRATION WAS SENSED. 2. HAVE PILOT ESTABLISH FLIGHT PROFILE WHEN VIBRATION WAS SENSED. 3. PLACE VIB PICKUP ON STA 95 BLOCK IN VERTICAL POSITION. 4. TUNE BALANCER TO 225, 675, AND 1350 RPM AND RECORD VIBRATION IN IPS. 5. PLACE VIB PICKUP ON STA 95 BLOCK IN LATERAL POSITION. 6. REPEAT STEP 4. 7. PLACE VIB PICKUP ON STA 482 BLOCK IN VERTICAL POSITION. 8. REPEAT STEP 4 9. PLACE VIB PICKUP ON STA 482 BLOCK IN LATERAL POSITION. 10. REPEAT STEP 4. 11. LAND HELlCOPTER AND ANALYZE RECORDED VIBRATIONS TABLE 2-1.2. TABLE 2-1.2. TASK 2-1.4. TABLE 2-1.2. TASK 2-1.3. TASK 2-1.4. TASK 2-1.5. TASK 2-1.6. TASK 2-1.5. TABLE 2-1.2.1B. NORMAL VIBRATION LEVELS AT 130 KNOTS IDENTIFY BALANCER RPM SET- TING AT WHICH HIGHEST LEV- EL OF VIBRATION WAS RECORDED. WAS HIGHEST LEVEL AT 225 RPM (1/REV)? REFER TO TROUBLE SYMPTOM TASK 2-1.3. 2-4.4 Change 5 GO TO NEXT PAGE

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