TM 55-1520-240-T7-1.4 FLIGHT CONTROL HYDRAULIC SYSTEM OPERATIONAL CHECK7-1.4INITIAL SETUPBattery ConnectedApplicable Configurations:Electrical Power OnAllHydraulic Power OnTools:Visual Check of Flight Control Hydraulic System Per-Noneformed (Task 7-1.3)Materials:NoneGeneral Safety Instructions:Personnel Required:Medium Helicopter Repairer (2)Rotary Wing Aviator (2)WARNINGReferences:Keep head, hands and other body partsTM 55-1520-240-10clear of moving flight controls. Hydrau-TM 55-1520-240-23lic forces are strong enough to causesevere injury.Equipment Condition:TM 55-1520-240-23:TASKRESULT1. Check that POWER XFR NO. 1 and NO. 2 switches (1If not, set switches (1 and 2) to OFF.and 2)are at OFF.CHECK CIRCUIT BREAKERS2. Checkthat HYDRAULICS NO. 1 BLOWER CONTandIf either circuit breaker (3 or 4) is open, close it. If NO. 1NO. 1 HYD COOLING BLOWER circuit breakers (3BLOWER CONT circuit breaker (3) opens again, go toand 4)are closed.Task 7-3.6. If NO. 1 HYD COOLING BLOWER circuitbreaker (4) opens again, go to Task 7-1.8.3. Checkthat HYDRAULICS FLT CONT and NO. 2If either circuit breaker (5 or 6) is open, close it. If FLTBLOWER circuit breakers (5 and 6)are closed.CONT circuit breaker (5) opens again, go to Task 7-3.8. IfNO. 2 BLOWER circuit breaker (6) opens again, go toTask 7-1.10.TASKRESULT4. Checkthat NO. 2 HYD COOLING BLOWER circuitIf circuit breaker (7) is open, close it. If it opens again, gobreaker (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 indicating1. Press and hold RESERVOIR LEVEL CHECK switchfluid 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 butshows reservoir not full, service No. 1 flight controlhydraulic 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 indicating2. Press and hold RESERVOIR LEVEL inidcator (10).fluid level in No. 2 flight control system reservoir. If pointerdoes not move, go to Task 7-3.11. If pointer moves butshows reservoir not full, service No. 2 flight controlhydraulic system. Refer to TM 55-1520-240-23.8. Release switch (9).9. Press and release four FILTER CHANGE lights andEach light (11) shall momentarily come on. If any lighttwo PUMP FAULT lights (11).does not come on, go to Task 7-1.13.10. Check NO. 1 HYD FLT CONTR (Without74) HYD 1Both 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 PAGE7-14 Change 17 Page 7-13 is a blank page.
Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business