INSPECT FOR CONTAMINATION OF HYDRAULIC SYSTEMS (Continued)

INSPECT FOR CONTAMINATION OF HYDRAULIC SYSTEMS

SAMPLE HYDRAULIC FLUID FROM FLIGHT CONTROL AND UTILITY SYSTEM RESERVOIR/COOLERS

TM-55-1520-240-23-6 CH-47D Heilcopter Manual
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TM 55-1520-240-23-6 7-8 INSPECT FOR CONTAMINATION OF HYDRAULIC SYSTEMS (Continued) 7-8 1. Check all six hydraulic filters (1). Inspect that red indicator button (2) on bottom of each filter has not extended. 2. If button (2) is extended, apply hydraulic power to that system. 3. Depress button (2). If checking utility system, have pilot in cockpit motor either engine for 30 seconds. If checking flight control system, have pilot in cockpit cycle control stick for 30 seconds. If button extends, filter element is clogged. 4. Remove hydraulic power. 5. Remove filter element on all contaminated filters (Tasks 7-33, 7-156, and 7-194 as required). 6. Inspect removed element and determine source of contamination (FM 1-509). 7. Install new filter element (Task 7-34, 7-157, or 7-195 as required). FOLLOW-ON MAINTENANCE: As required. Close right forward walk platform (Task 2-2). Close pylon right access door (Task 2-2). END OF TASK 7-55

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