POWER TURBINE INLET TEMPERATURE SYSTEM <a href="http://armycommunications.tpub.com/ss05220/ss052200177.htm">OPERATIONAL CHECK</a> AND EMERGENCY POWER INDICATING SYSTEM TEST (Continued)

P O W E R T U R B I N E I N L E T T E M P E R A T U R E S Y S T EM OPERATIONAL CHECK AND EMERGENCY POWER INDICATING SYSTEM TEST (Continued)

NO. 1 OR NO. 2 ENGINE EMERGENCY POWER LIGHTS WILL NOT COME ON WHEN PRESSED TO TEST

TM-55-1520-240-T-2 CH-47D Heilcopter Manual
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TM 55-1520-240-T 8-5.3 POWER TURBINE INLET TEMPERATURE SYSTEM OPERATIONAL CHECK AND EMERGENCY POWER INDICATING SYSTEM TEST (Continued) 8-5.3 TASK RESULT CAUTION The following procedure simu- lates engine overtemperature to check out indicator and timer cir- cuits. The timer will operate, Pilot's and copilot's EMERG PWR lights (5) shall therefore, follow procedures be out. If not, replace NO. 1 ENGINE PTIT indica- closely to avoid excessive time tor (6). being added to engine overtemperature time. 14. Have helper observe NO. 1 ENGINE PTIT in- NO. 1 ENGINE timer (9) shall operate when PTIT dicator (6). Increase millivolt output from indication is between 890°C and 910°C. If not. tester until NO. 1 ENGINE timer (9) starts go to Task 8-5.9. to operate. NO. 1 ENGINE flag indicator (10) shall be striped. If not, go to Task 8-5.10. Pilot's and copilot's EMERG PWR lights (5) shall be on. If not. go to Task 8-5.1.1. 15. Immediately reduce tester output until NO. 1 NO. 1 ENGINE timer (9) shall stop. If it does not. ENGINE PTIT indication is between 800°C replace NO. 1 ENGINE PTIT indicator. and 820C. NO. 1 ENGINE flag indicator (10) shall remain striped. If not, replace NO. 1 ENGINE PTIT indica- tor. Pilot's and copilot's EMERG PWR lights (5) shall be out. If not, replace NO. 1 ENGINE PTIT indica- tor. 16. Disconnect test harness from plug (15). Connect plug (15) to receptacle (16). 17. Disconnect plug (15) at NO. 2 ENGINE NO. 2 ENGINE timer (12) shall not be operating. If disconnect shelf. Connect cable from tester it is, replace NO. 2 ENGINE PTIT indicator. into receptacle (1 6) with test harness T140. Have helper observe NO. 2 ENGINE PTIT NO. 2 ENGINE flag indicator (13) shall be black. If indicator (6). Increase millivolt output from it is striped, replace NO. 2 ENGINE PTIT indicator. tester until PTIT indication is 8200C. Check EMERG POWER panel (9). TASK RESULT Pilot’s and copilot’s EMERG PWR lights (5) shall be out. If not, replace NO. 1 ENGINE PTIT indica- tor (6). 18. Have helper observe NO. 2 ENGINE PTIT Pilot's and copilot's EMERG PWR lights (5) shall indicator (6). Increase millivolt output from be out. If not, replace NO. 1 ENGINE PTIT indica- tester until NO. 2 ENGINE timer (12) starts to tor (6). operate. NO. 2 ENGINE timer (12) shall operate when PTIT indication is between 890C and 910°C. If not. go to Task 8-5.12. 19. Immediately reduce tester output until NO. 2 NO. 2 ENGINE timer (12) shall stop. If it does not, ENGINE PTIT indication is between 800°C replace NO. 2 ENGINE PTIT indicator. and 820C. NO. 2 ENGINE flag indicator (13) shall remain striped. If not, replace NO. 2 ENGINE PTIT indica- tor. Pilot's and copilot's EMERG PWR lights (5) shall be out. If not, replace NO. 2 ENGINE PTIT indica- tor. 20. Disconnect test harness from plug (15). Connect plug (15) to receptacle (16). 21. Reset NO. 1 and NO. 2 ENGINE FLAG RESET switches (11 and 14). FOLLOW-ON MAINTENANCE TM 55-1520-240-23: Battery Disconnected Electrical Power Off Hydraulic Power Off Close No. 1 Engine Work Platform Close No. 1 Engine Lower Access Door Close No. 2 Engine Work Platform Close No. 2 Engine Lower Access Panel END OF TASK Change 1 8-81

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