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During the TEAC, PTIT
U.  DIFFERENTIAL CURRENT PROTECTION CIRCUIT CHECK

TM-1-1520-240-MTF Army Model CH-47D Heilcopter (EIC:RCD) Manual
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TM 1-1520-240-MTF 4-44 c.   Enter   figure   5-10   at   the   recorded   FAT, proceed vertically to the pressure altitude, then  horizontally  to  the  torque  available scale. 12.  The  engine  trim  is  acceptable  if  the  following conditions are met: a.   Recorded  N1  is  between  the  values  from step 11a which define acceptability and Recorded PTIT is between the values from step 11b which define acceptability and Recorded torque exceeds the value from step 11c. or b.   For engines that fall above the band 1 line in figure  5-9  the  TEAC  is  acceptable  if  the following   conditions   are   met:   Recorded PTIT is within band 1 figure 5-9. and Recorded torque exceeds the value from step 11c and Recorded N1 is within 5%, but does not exceed the Max N1 line of figure 5-8. 13.  If the criteria of step 12 are not met, troubleshoot the engine indicating systems prior to trimming the engine to comply. Do not trim the engine to exceed PTIT limits. To increase N1 or PTIT, turn the N1 trim adjustment clockwise. To decrease N1     or     PTIT,     turn     N1     trim     adjustment counterclockwise. Trim sensitivity is , 1/4 turn of







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