ENGINE ACCESSORY GEARBOX CHIP DETECTORS OPERATIONAL CHECK (Continued)

4-13.3 ENGINE ACCESSORY GEARBOX CHIP DETECTORS OPERATIONAL CHECK

4-13.4 ENG 1 OR ENG 2 CHIP DETR CAPSULE IS LIT

TM-55-1520-240-T-1 CH-47D Heilcopter Manual
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TM 55-1520-240-T 4-13.3 ENGINE ACCESSORY GEARBOX CHIP DETECTORS OPERATIONAL CHECK (Continued) 4-13.3 TASK RESULT 1. Check that HYDRAULICS MAINT PNL circuit breaker If circuit breaker (1) is open, close it. If it opens again, go (1) is closed. to task 8-14.3. 2. Check master caution panel (2). If ENG 1 or ENG 2 CHIP DETR capsule (3 or 4) is lit, go to task 4-13.4. 3. Check NO. 1 and NO. 2 ENGINE CHIP DETECTOR Both indicators shall be all-black. If either indicator dis- indicators (5 and 6). plays black-and-white fan, go to task 4-13.5. 4. Set and hold GND switch (7) to TEST. ENG 1 and ENG 2 CHIP DETR capsules (3 and 4) shall come on. NO. 1 and NO. 2 ENGINE CHIP DETECTOR indicators (5 and 6) shall change to black and white fan. If ENG 1 CHIP DETR capsule is out, go to task 4-13.6. If ENG 2 CHIP DETR capsule is out, go to task 4-13.7. If NO. 1 or NO. 2 ENGINE CHIP DETECTOR indicator is all-black, go to task 4-13.8. 5. Set GND switch (7) to RESET, then to GND. NO. 1 and NO. 2 ENGINE CHIP DETECTOR indicators (5 and 6) shall change to all-black. If both indicator displays are not black, go to task 4-13.5. CHECK NO. 1 ENGINE ACCESSORY GEARBOX CHIP DETECTOR 6. Short terminal stud of NO. 1 engine chip detector (8) ENG 1 CHIP DETR capsule (3) shall come on and NO. 1 to its mounting base with a jumper wire. ENGINE CHIP DETECTOR indicator (5) shall change to black-and white fan. It capsule does not come on and indicator display does not change, go to task 4-13.9. 7. Remove jumper. ENG 1 CHIP DETR capsule (3) shall go out. If it stays on, go to task 4-13.4. 8. Set GND switch (7) to RESET, THEN TO GND. NO. 1 ENGINE CHIP DETECTOR indicator (5) display shall change to all-black. If it does not, go to task 4-13.5. CHECK NO. 2 ENGINE ACCESSORY GEARBOX CHIP DETECTOR 9. Short terminal stud of No. 2 engine chip detector (8) ENG 2 CHIP DETR capsule (4) shall come on and NO. 2 to its mounting base with a jumper wire. ENGINE CHIP DETECTOR indicator (6) shall change to black-and-white fan. If capsule does not come and indi- cator display does not change, go to task 4-13.9. 10. Remove jumper. ENG 2 CHIP DETR capsule (4) shall go out. If it stays on, go to task 4-13.4. TASK RESULT 11. Set GND switch (7) to RESET then to GND. NO. 2 ENGINE CHIP DETECTOR indicator (6) display shall change to all-black. If it does not, go to task 4-13.5. FOLLOW-ON MAINTENANCE: TM 55-1520-240-23: Remove electrical power. Disconnect battery. Close No. 1 or No. 2 engine work platform and access door. END OF TASK Change 17 4-317

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