TM 55-2840-254-23
1-107
1-107 TEST ENGINE (AVIM) (Continued)
NOTE
If surge occurs, immediately retard N1 master hydronic control as
required to get out of surge. Using special screwdriver (T33), reset
fuel control acceleration schedule three clicks for 0.1 second
change (clockwise - increase; counterclockwise - decrease) as
required by amount of surge. Repeat accelerations. Combustor
static pressure may be calibrated at steady state to indicate com-
pletion of acceleration. To determine percent N1 speeds required
for accelerations as stated above, use the following calculations as
a guide.
CALCULATIONS:
3750 (SHP accelerations are timed to)
= 99.0 percent N1 speed
= 63.0 percent N1 speed
Subtract Ground Idle Speed
Result
= 36.0 percent N1 speed
Multiply result by percent
= 0.95 percent of power
of Power
= 34.2 percent N1 speed
Result
Add original Ground Idle speed
to Result
= 63.0 percent N1 speed
Result is percent N1 speed
to be obtained at 95 percent
power change
= 97.2 percent N1 speed
GO TO NEXT PAGE
1-489
