TM 55-1520-240-T 7-1.4  FLIGHT CONTROL HYDRAULIC SYSTEM OPERATIONAL CHECK 7-1.4 INITIAL SETUP Battery Connected Applicable Configurations: Electrical Power On All Hydraulic Power On Tools: Visual Check of Flight Control Hydraulic System Per- None formed (Task 7-1.3) Materials: None General Safety Instructions: Personnel Required: Medium Helicopter Repairer (2) Rotary Wing Aviator (2)         WARNING References: Keep head, hands and other body parts TM 55-1520-240-10 clear of moving flight controls.  Hydrau- TM 55-1520-240-23 lic forces are strong enough to cause severe injury. Equipment Condition: TM 55-1520-240-23: TASK RESULT 1.   Check that POWER XFR NO. 1 and NO. 2 switches (1   If not, set switches (1 and 2) to OFF. and 2) are at OFF. CHECK CIRCUIT BREAKERS 2.   Check that HYDRAULICS NO. 1 BLOWER CONT and If either circuit breaker (3 or 4) is open, close it.  If NO. 1 NO. 1 HYD COOLING BLOWER circuit breakers (3 BLOWER CONT circuit breaker (3) opens again, go to and 4) are closed. Task 7-3.6.  If NO. 1 HYD COOLING BLOWER circuit breaker (4) opens again, go to Task 7-1.8. 3.   Check that HYDRAULICS FLT CONT and NO. 2 If either circuit breaker (5 or 6) is open, close it.  If FLT BLOWER circuit breakers (5 and 6) are closed. CONT circuit breaker (5) opens again, go to Task 7-3.8.  If NO. 2 BLOWER circuit breaker (6) opens again, go to Task 7-1.10. TASK RESULT 4.   Check that NO. 2 HYD COOLING BLOWER circuit If circuit breaker (7) is open, close it.  If it opens again, go breaker (7) is closed. to Task 7-1.11. 5.   Set FLT CONT RESERVOIR LEVEL switch (8) to NO. Pointer on indicator (10) shall move upscale indicating 1.  Press and hold RESERVOIR LEVEL CHECK switch fluid level in No. 1 flight control system reservoir.  If pointer (9).  Check RESERVOIR LEVEL indicator (10). does not move, go to Task 7-1.12.  If pointer moves but shows reservoir not full, service No. 1 flight control hydraulic system.  Refer to TM 55-1520-240-23. 6.   Release switch (9). 7.   Set FLT CONT RESERVOIR LEVEL switch (8) to NO. Pointer on indicator (10) shall move upscale indicating 2.   Press and hold RESERVOIR LEVEL inidcator (10).   fluid level in No. 2 flight control system reservoir.  If pointer does not move, go to Task 7-3.11.  If pointer moves but shows reservoir not full, service No. 2 flight control hydraulic system.  Refer to TM 55-1520-240-23. 8.   Release switch (9). 9.   Press and release four FILTER CHANGE lights and Each light (11) shall momentarily come on.  If any light two PUMP FAULT lights (11). does not come on, go to Task 7-1.13. 10.    Check NO. 1 HYD FLT CONTR (Without 74 ) HYD 1 Both capsules (12 and 13) shall be on.  If either capsule is (With 74 ) and NO. 2 HYD FLT CONTR (Without 74 ) out, go to Task 7-1.14. HYD 2 (With 74 ) capsules (12 and 13). GO TO NEXT PAGE 7-14  Change 17  Page 7-13 is a blank page.