TM 1-1520-240-MTF
4-20
g. Check and record engine time and N1
speed to ground idle (50 to 59% within 45
sec). If abnormal see figure 5-15. N1 speed
and T1 temperature on the Chart reflect
DECU values and not those indicated in the
cockpit. The SPORTS computer must be
installed and referenced to use chart.
CAUTION
After starting the first engine, the second en-
gine must be started or motored for 10 sec-
onds within 3 minutes. When operating for ex-
tended periods with only one engine operat-
ing, the second engine must be motored for 10
seconds every 30 minutes. The N2 section of
the second engine starts turning when the
first engine is started; however, the lubrica-
tion system of the second engine is driven by
N1 section: which does not begin to turn until
the START sequence is initiated. Delay in
starting the second engine will result in exces-
sive wear on the N2 bearing package and
seals.
2. Second engine — Start by using the same
method as the first.
