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
