TM 1-1520-240-MTF
4-38
b. Using the No. 1 & 2 engine beep trim switch,
set the RRPM to 100%.
c. Increase the thrust control to set the No. 1
engine N1 speed to 92%.
d. Using the No. 1 ECL, retard the N1 speed to
70% while maintaining a constant thrust
position.
e. Rapidly advance the No. 1 ECL to flight
while timing the N1 speed acceleration to
90%.
f. Repeat
the
above
two
steps
and
numerically average the two times. The
average time from ECL advance to 90
percent N1 shall not exceed the values
given below.
OAT
(Deg. Celsius)
Max Time From
70% N1 to 90% N1 (seconds)
–40
2.4
–30
2.6
–20
2.8
–10
3.0
0
3.2
10
3.4
20
3.8
30
4.3
40
4.7
g. Place thrust control in ground detent
position and decrease the No. 1 and No. 2
engine beep trim switch for 8 seconds.
h. Place the No. 2 auto/manual switch to the
auto position.
