CARGO RAMP AND DOOR VISUAL CHECK (Continued)

CARGO RAMP AND DOOR MANUAL OPERATIONAL CHECK

TM-55-1520-240-T-1 CH-47D Heilcopter Manual
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TM 55-1520-240-T 7-3.3 CARGO RAMP AND DOOR VISUAL CHECK (Continued) 7-3.3 TASK RESULT 1. Check ramp control valve (1). NOTE Ramp control valves without if are AVIM serviceable as described in Chapter 7 of TM 55- 1520-240-23. Maintenance to ramp control valves with M is limited to replacement only. If valve (1) is damaged or valve handle (2) is bent or broken, replace valve. If hydraulic tubes to valve (1) are loose or damaged, tighten or replace as required. 2. On ramp control valves with (65), check electrical If loose, tighten electrical receptacle (2.1) and plug (2.2). Replace plug (2.2) if damaged. If connections. receptacle (2.1) is damaged in ramp control valve replace ramp control valve. 3. Check door override valve (3). If valve (3) is damaged, replace it. If hydraulic tubes to valve are loose or damaged, tighten or replace as required. 4. Check sequence valve (4). If valve (4) is damaged, replace it. If hydraulic tubes to valve are loose or damaged, tighten or replace as required. 5. Check right side ramp actuating cylinder (5). If cylinder (5) is damaged, replace it. If hydraulic tubes to cylinder are loose or damaged, tighten or replace as required. 6. Repeat step 4 for left side ramp actuating cylinder (5). 7. Check transfer cylinder (6). If cylinder (6) is loose or damaged, tighten or replace it as required. If hydraulic tube to cylinder is loose or damaged, tighten or replace it as required. 8. Check ramp solenoid valve (7). If valve (7) is loose or damaged, tighten or replace it as required. If wiring or electrical connector to valve is damaged, replace it. 9. On aircraft without .[65] check RAMP If switches (8, 9, or 11) or guard (10) are loose or damaged, tighten or replace as required. switch (8). On aircraft with [65], check RAMP PWR Check for loose or damage connections and tighten or replace connectors as required. switch (9), switch guard (10), and RAMP EMER switch (11). 10. On aircraft with [65], check time delay relay (12) in Tighten relay if found to be loose. Replace relay if damaged. Tighten or replace loose wires overhead panel. or connections.- FOLLOW-ON MAINTENANCE: None END OF TASK Change 14 7-123

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