4-10.3 ENGINE START AND IGNITION SYSTEM VISUAL CHECK

4-10.2 ENGINE START AND IGNITION SYSTEM WIRING DIAGRAM

ENGINE START AND IGNITION SYSTEM VISUAL CHECK (Continued)

TM-55-1520-240-T-1 CH-47D Heilcopter Manual
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TM 55-1520-240-T 4-10.3 ENGINE START AND IGNITION SYSTEM VISUAL CHECK 4-10.3 INITIAL SETUP References: Applicable Configurations: TM 55-1520-240-23 With 74 Equipment Condition: Tools: TM 55-1520-240-23: Electrical Repairer's Tool Kit, Battery Disconnected NSN 5180-00-323-4915 Electrical Power Off Materials: Hydraulic Power Off None Engine Work Platforms Open Engine Access Covers Open Personnel Required: Aircraft Electrician TASK RESULT 1. Check FADEC panel (1). If switch (2) is loose or damaged, tighten or replace it as required. 2. Check DECU No. 1 (3). If DECU No. 1 (3) is loose or damaged, tighten or replace it. If any connector is loose, tighten or replace it. If any wire in DECU connectors is broken or damaged, repair or replace it. 3. Check DECU No. 2 (4). If DECU No. 2 (4) is loose or damaged, tighten or replace it. If any connector is loose, tighten or replace it. If any wire in DECU connectors is broken or damaged, repair or replace it. 4. Check No. 1 engine pilot valve (5). If valve (5) is loose or damaged, tighten or replace it as required. If wiring or connector to valve is damaged, repair or replace it as required. 5. Check No. 2 engine pilot valve (6). If valve (6) is loose or damaged, tighten or replace it as required. If wiring or connector to valve is damaged, repair or replace it as required. 6. Check No. 1 engine (7). If ignition exciter (8) is damaged, replace it. If ignition coil and cable assembly (9) is damaged, replace it. If any one of four spark plugs (10) is damaged, replace it. If start fuel solenoid valve (11) is damaged, replace it. If harness (12) to exciter (8) and valve (11) is damaged, replace it. 7. Check No. 2 engine (13). If ignition exciter (8) is damaged, replace it. If ignition coil and cable assembly (9) is damaged, replace it. If any one of four spark plugs (10) is damaged, replace it. If start fuel solenoid valve (11) is damaged, replace it. If harness (12) to exciter (8) and valve (11) is damaged, replace it. FOLLOW-ON MAINTENANCE: TM 55-1520-240-23: Close engine access covers. Close engine work platforms. GO TO NEXT PAGE 4-224 Change 17

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