TM 1-1520-240-MTF
4-31
COMPLETE PROCEDURE
Engine No.
1
Engine No.
2
Maximum PTIT allowed
806
899
Recorded PTIT (subtracted)
-775
-872
TEMP MARGIN VALUE
31
27
PAC Number Margins
31 5=6.2
27 5=5.4
Rounded PAC Margin
6
5
DECU PAT switch value
26
28
PATN adj for FAT +14_C
-1
-1
Adjusted PATN
25
27
Adjusted PATN
25
27
PAC Margins(subtracted)
-6
-5
DECU PAT Trigger Values
19
22
Enter these values as the PAT Trigger Value on the PAT
LOG.
M. 712 INTERSTAGE AIR-BLEED SPEED ADJUST-
MENT
Reference:
TM 55-1520-240-23
NOTE
Unsatisfactory bleed band cycling or compressor
stall may be encountered if bleed band closure is
not within N1 speed range specified. If N1 speed
for bleed band closure is above that specified, an
increase in specified fuel consumption will result
until bleed band closes. In an extreme case, where
belled band does not close at all, or may be open
again at high power, engine will suffer loss of
maximum power.
1-38.
