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6-2.3  TRANSMISSION CHIP DETECTORS AND DEBRIS SCREENS OPERATIONAL CHECK
CHECK AFT TRANSMISSION CHIP DETECTOR AND DEBRIS SCREEN INSTALLATION

TM-55-1520-240-T-1 CH-47D Heilcopter Manual
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TM 55-1520-240-T 6-2.3  TRANSMISSION CHIP DETECTORS AND DEBRIS SCREENS OPERATIONAL CHECK (Continued) 6-2.3 TASK RESULT 5.  Set GND switch (6) to RESET, then to GND. Indicators (3 and 4) shall change to all-black.  If any indicator display is not all-black, go to Task 6-2.6 or 6-2.7. CHECK FORWARD TRANSMISSION CHIP DETECTOR AND DEBRIS SCREEN INSTALLATION 6.  Disconnect connector from debris detection screen cap (8). NOTE Cap holds  2 to 3 ounces of oil. 7.    Hold  container  under  cap  (10).    Push  up  center  of  cap and pull down on cap edge to remove cap.  Drain oil  into container. 8.      Filter   drained   oil   through   cloth   (E120).      Check   cloth, screen (11), and chip detector (12) for debris.  Retain debris for contamination analysis.  (Refer to TM 55-1520240-23.) 9.  Connect connector to cap (10). CAUTION Be   careful   when   placing   jumper   wire   on screen.        Rough    handling    could    damage debris screen. 10.  Place a jumper wire across at least four consecutive FWD TRANSMISSION DEBRIS SCREEN indicator (13) wires on the inside mesh of screen (11). shall change to black-and-white fan.  If it does not, go to Task 6-2.11. 11.  Remove jumper wire from debris screen.  Place XMSN CHIP DET (Without 74)  XMSN CHIP DETR (With jumper wire across gap of chip detector (12). 74) capsule (9) shall come on.  FWD TRANSMISSION CHIP DETECTOR indicator (14) shall change to black- and-white fan.  If capsule (9) does not come on or indicator (14) does not change display, go to Task 6-2.12. 12.  Remove jumper wire .   XMSN CHIP DET (Without 74)XMSN CHIP DETR (With 74) capsule (9) shall go out. 13.  Set GND switch (6) to RESET, then to GND.   Indicators (13 and 14) shall change to all-black. 14.  Install debris detection screen cap (10). GO TO NEXT PAGE Change 17  6-33







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