TM 55-1520-240-T 4-10.4    ENGINE START AND IGNITION SYSTEM OPERATIONAL CHECK 4-10.4 INITIAL SETUP References: Applicable Configurations: TM 55-1520-240-10 With 74 TM 55-1520-240-23 Tools: Equipment Condition: Aircraft Mechanic's Tool Kit, TM 55-1520-240-23: NSN 5180-00-323-4692 Battery Connected Materials: Electrical Power On None Hydraulic Power On Engine Start and Ignition System Visual Check Personnel Required: Medium Helicopter Repairer Army Rotary Wing Aviator (2) TASK RESULT 1. Check that FADEC NO. 1 START & IGN circuit breaker If START & IGN circuit breaker (1) is open, close it.  If it (1) is closed. opens again, go to task 4-10.5. 2. Check that FADEC NO. 2 START & IGN circuit breaker If START & IGN circuit breaker (2) is open, close it.  If it (2) is closed. opens again, go to task 4-10.6. 3. On FADEC panel (3), check ENG 1 and ENG 2 switches  If switches are not at PRI, set switches to PRI. (4 and 5) are at PRI. 4. Move ENGINE CONDITION NO. 1 and NO. 2 levers (6 If display shows 88, go to step 5.  If display is blank or and 7) to GND.  Look at DECU NO. 1 and NO. 2 (8 and other than 88, go to task 4-12.4. 9) fault display (10). 5. Move ENGINE CONDITION levers (6 and 7) to STOP. START NO. 1 ENGINE CAUTION If the No. 1 engine is the first engine started, start the No. 2 engine within 3 minutes. 6. Have pilot start No. 1 engine.  Monitor engine N1, ENG N1 indication accelerates to 10% with ENG START switch TEMP, OIL PRESS, and N2. (11) at 1.  At that point, pilot releases ENG START switch and N1 indication increases and stabilizes at 50 to 59% within 45 seconds.  Engine OIL PRESS should be  20 psi minimum. If No. 1 engine N1 does not indicate  10%, go to task 4-10.7. If No. 1 engine does not start or accelerate to  50 to 59% N1, go to task 4-10.8. If engine has high PTIT or hot start, go to task 4-8.2. TASK RESULT If engine OIL PRESS is not 20 psi minimum, go to task 8-3.3. 7. Have pilot stop No. 1 engine if no further checks are to be performed. 8. Move ENGINE CONDITION NO. 1 lever (6) to GND. If display shows 88, go to step 9.  If display is blank or Look at DECU NO. 1 (8) fault display (10).   other than 88, go to task 4-12.4. 9. Move ENGINE CONDITION NO. 1 lever (6) to STOP. START NO. 2 ENGINE CAUTION If the No. 2 engine is the first engine started, start the No. 1 engine within 3 minutes. 10. Have pilot start No. 2 engine.  Monitor engine N1, ENG N1 indication accelerates to 10% with ENG START switch TEMP, OIL PRESS, and N2. (11) at 2.  At that point, pilot releases ENG START switch and N1 indication increases and stabilizes at 50 to 59% within 45 seconds.  Engine OIL PRESS should be  20 psi minimum. If No. 2 engine N1 does not indicate 10%, go to task 4-10.11. If No. 2 engine does not start or accelerate to  50 to 59% N1, go to task 4-10.12. If engine has high PTIT or hot start, go to task 4-8.4. If engine OIL PRESS is not 20 psi minimum, go to task 8-3.3. 11. Have pilot stop No. 2 engine if no further checks are to be performed. 12. Move ENGINE CONDITION NO. 2 lever (7) to GND. If display shows 88, go to step 13.  If display is blank or Look at DECU NO. 2 (9) fault display (10).   other than 88, go to task 4-12.4. 13. Move ENGINE CONDITION NO. 2 lever (7) to STOP. FOLLOW-ON MAINTENANCE: TM 55-1520-240-23: Hydraulic power off. Electrical power off. Battery disconnected. GO TO NEXT PAGE 4-226  Change 17