TM 1-1520-240-MTF
4-28
c. Stabilize for 15 seconds.
d. Avtivate Power Assruance Test Switch.
e. Record DECU hexadecimal digit series
displayed as the Power Assurance Value or
“PATN”. Determine the appropriate PATN
adjustment Value from TM 55-1520-240-23
or aircraft log book utilizing the current FAT.
Combine (add or subtract) the PATN FAT
Adjustment Value to the PATN to determine
the Adjusted Power Assurance Value (or
Adjusted PATN)
f. Repeat steps 1.b. through 1.e. for other
engine.
g. Take
the
TEMP
MARGIN
VALUE
determined
during
the
Maximum
Continuous Power Check or Maximum
Power Check (paragraph K.g.(2) or K.k.(2).
Divide the TEMP MARGIN VALUE by 5 and
round the result off to the nearest whole
number to determine the PACN Margin.
h. Subtract PACN Margin from the Adjusted
Power Assurance TEST Value (Adjusted
PATN) to obtain the PAT Trigger Value.
Enter this value as the PAT Trigger Value on
the PAT LOG in the aircraft log book IAW
TM-55-1520-240-23.
