NO FWD VERTICAL OR AFT VERTICAL INDICATION ON IPS INDICATOR (Continued)

5-2.8 NO FWD VERTICAL OR AFT VERTICAL INDICATION ON IPS INDICATOR

5-2.9 GREEN POWER STATUS LIGHTS DO NOT COME ON WHEN HELlTUNE UNIT IS TURNED ON

TM-55-1520-240-T-1 CH-47D Heilcopter Manual
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TM 55-1520-240-1 5-2.8 NO FWD VERTICAL OR AFT VERTICAL INDICATION ON IPS INDICATOR (Continued) 5-2.8 IS 28VDC POWER INDICATOR ON STROBEX LIT? REFER TO TROUBLE SYMPTOM TASK 5-2.5. LOCATE SHORT ON WIRES W673-176-22 RED, W673-179- 22,W673-178-22,W673-169- 22 RED, OR W673-170-22 BLU AND SHIELD BETWEEN PLUG 300P47 AND BLADE TRACK RE- CEPTACLE 138J1. REPAIR OR REPLACE WIRE AS REQUIRED. REMOVE FWD ACCELEROME- TER BLOCK TEST VERTICAL ACCELEROMETER AND WIRING (TM 55-4920 -402-13&P). DID ACCELEROMETER BLOCK CHECK GOOD? REMOVE JUMPER DISCONNECT PLUG 300P47 AT STA 105. CHECK CONTINUITY ON BLADE TRACK RECEPTACLE 138J1 BETWEEN PINS R AND J AND PINS F AND G. IS CONTINUITY PRESENT? DID IPS METER POINTER MOVE UPSCALE AND NOT RETURN TO ZERO WHEN ROTARY SWITCH SET TO AFT VERTICAL? REMOVE JUMPER. LOCATE OPEN IN WIRES W639-417-20 RED, W673-176-22 RED, W639-415-20 RED, W673-169- 22 RED, OR W673-179-22 BE- TWEEN FWD ACCELEROMETER BLOCK PLUG 138P2 AND BLADE TRACK RECEPTACLE 138J1 REPAIR OR REPLACE WIRE AS REQUIRED. LOCATE SHORT ON WIRES W639-415-20 RED, W639-416- 20 BLU, OR W639-417-20 RED AND SHIELD BETWEEN RECEP- CHECK CONTINUITY ON RECEP- TACLE 300J47 AT STA 105 BETWEEN PINS 16 AND 22, 23 AND 24. IS CONTINUITY PRE- SENT) REPAIR OR REPLACE ACCELER- OMETER BLOCK AS REQUIRED. TACLE 300J47 AND PLUG 138P2. REPAIR OR REPLACE WIRE AS REQUIRED. REMOVE AFT ACCELEROMETER BLOCK TEST VERTICAL ACCEL- EROMETER AND WIRING (TM 55-4920-402-13&P). DID AC- CELEROMETER BLOCK CHECK GOOD? TROUBLESHOOT VIBREX BAL- CHECK FOR CONTINUITY ON ANCER (TM 55-4920 -402- No RECEPTACLE 300J44 BETWEEN 13&P) PINS 55 AND 51, 52 AND 53. IS CONTINUITY PRESENT? END OF TASK Change 4 5-17

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