TM 55-1520-240-T 8-6.3 TORQUE INDICATING SYSTEM OPERATIONAL CHECK (Continued) 8-6.3 TASK 1. Check   that   ENGINE   NO.   1   AC   TORQUE   circuit breaker (1) is closed. 2. Check   that   ENGINE   NO.   1   DC   TORQUE   circuit breaker (2) is closed. 3. Check   that   ENGINE   NO.   2   AC   TORQUE   circuit breaker (3) is closed. 4. Check   that   ENGINE   NO.   2   DC   TORQUE   circuit breaker (4) is closed. 5. Check  No.   2   pointer   on   pilot   (5)   and   copilot   (6) torque indicators. NOTE If    pointer    is    spinning,    have    helper manually turn rotor blades until spinning  stops.    If  spinning  continues after one revolution of the blades, go to next step. 6. Check  No.  1  pointer  on  pilot  (5)  and  copilot  (6)  torque indicators. NOTE If    pointer    is    spinning,    have    helper manually turn rotor blades until spinning  stops.    If  spinning  continues after   one   revolution   of   blades,   go   to next step. NOTE If  torque  signal  simulator   LTCT  24137- 03   is   not   available,   do   not   perform steps 7 thru 10.  Go to step 11. 7. Install  torque  signal  simulator   LTCT  24137-03  on No. 1 engine.  Reference operating manual 5855A. 8. Check No. 1 engine torque indication using torque signal simulator     LTCT     24137-03. Reference operating manual 5855A. 9. Install  torque  signal  simulator   LTCT  24137-03  on No. 2 engine.  Reference operating manual 5855A. 10.   Check No. 2 engine torque indication using torque signal simulator     LTCT     24137-03. Reference operating manual 5855A. 11.   Have pilot start both engines and stabilize rotors at ground idle. 12.   Have pilot perform TORQUE DIFFERENTIAL CHECK.  (Ref TM 55-1520-240-MTF.) RESULT If  ENGINE NO. 1 AC TORQUE circuit breaker (1) is open, close it.  If it opens again, go to task 8-6.4. If  ENGINE NO. 1 DC TORQUE circuit breaker (2) is open, close it.  If it opens again, go to task 8-6.5. If  ENGINE NO. 2  AC  TORQUE  circuit  breaker  (3)  is  open, close it.  If it opens again, go to task 8-6.4. If  ENGINE NO. 2 DC TORQUE circuit breaker (4) is open, close it.  If it opens again, go to task 8-6.5. No.  2  pointer  on  both  torque  indicators  (5  and  6)  shall  be below  10%.    If  not,  adjust  torque  indicator  to  zero.    (Ref TM 55-1520-240-23.) No.  1  pointer  on  both  torque  indicators  (5  and  6)  shall  be below  10%.    If  not,  adjust  torque  indicator  to  zero.    (Ref TM 55-1520-240-23.) No.  1  pointer  on  pilots  and  copilots  torque  indicators  (5 and 6) shall read    2%  of  simulator  selector  switch  value. If it does not, go to task 8-6.8. No.  2  pointer  on  pilots  and  copilots  torque  indicators  (5 and 6) shall read    2%  of  simulator  selector  switch  value. If it does not, go to task 8-6.9. TASK 13.   Check No. 1 and No. 2 pointers on pilot and copilot torque indicators (5 and 6). 14.   Have pilot shut down both engines. FOLLOW-ON MAINTENANCE: TM 55-1520-240-23: Battery disconnected. Electrical power off. Hydraulic power off. RESULT No.   1   pointer   on   both   torque   indicators   (5   and   6)   shall indicate required torque.  If not, go to task 8-6.6. If No. 1 pointer on both torque indicators (5 and 6) rotates clockwise or counterclockwise continuously, replace No. 1 engine   torquemeter  kit  (junction  box,  output  shaft,  and head assembly).  Ref TM 55-2840-254-23. If   No.   1   pointer   on   both   torque   indicators   (5   and   6) operates erratically, go to task 8-6.10 if  Lycoming On Wing Comparator  LTCT 28295-01 is available.  If it is not, go to task 8-6.6. No.   2   pointer   on   both   torque   indicators   (5   and   6)   shall indicate required torque, if not, go to task 8-6.7. If No. 2 pointer on both torque indicators (5 and 6) rotates continuously,     replace     No.     2     engine    torquemeter     kit (junction   box,   output   shaft   and   head   assembly).      Ref TM 55-2840-254-23. If   No.   2   pointer   on   both   torque   indicators   (5   and   6) operates erratically, go to task 8-6.11 if  Lycoming On Wing Comparator  LTCT 28295-01 is available.  If it is not, go to task 8-6.7. END-OF-TASK Change 19  8-106.1