TM 1-1520-240-MTF
2-81
IN-FLIGHT (CONT.)
d.
712 Decrease rotor rpm to 97%, and start
clock. 714A FADEC NR% switch —
Decrease RRPM to 97% and start clock.
Absorbers should retune within 60 seconds.
e. Return RRPM to 100%.
8. Rotor RPM Droop Check and Thrust Rod
Slippage Check.
a. Stabilize airspeed at 125 knots straight and
level.
b. Rotor rpm 100%.
(1) Maintaining altitude and direction 712
without beeping RRPM, increase thrust
as necessary to stabilize airspeed at
140 knots with thrust brake trigger
depressed. Note and record any
change in RRPM from 100%. Note dual
engine TRQ then release thrust brake
trigger and relax pressure on thrust.
Note and record any change in dual
engine TRQ.
(2) Maximum change in rotor rpm shall be
712 2% or 714A +1%.
(3) Maximum thrust rod slippage with
thrust brake applied shall be 2% dual
engine torque.
9. Speed Sweep — Check.
Stabilize airspeed at 140 knots.
a. Record longitudinal stick position.
b. Record lateral stick position.
c. Record directional pedal separation.
d. Compare
pilot
and
copilot
airspeed
indicators (6 knots maximum difference).
