TM 1-1520-240-MTF
4-18
g. ENGINE OIL PRESS — Check and record
(20 psi Minimum).
h. Engine instruments — Check.
NOTE
Ground idle 60.0 to 63.0 percent N1 is the mini-
mum speed at which the engine will operate satis-
factorily for extended periods. If the engine speed
stabilizes below ground idle, shut down the engine
and investigate.
i. Ground idle speed after 45 seconds —
Check and record.
NOTE
If the start is not normal, abort it. If a second start
is to be attempted, wait at least 15 seconds after
the tachometer indicates zero before staring. This
will allow sufficient time for fuel to drain out of the
combustion chamber.
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.
