TASK 3 - TRACK AND BALANCE MAIN ROTOR IN FLIGHT
e. On the measurement screen, highlight the desired flight condition (FPG100 for AH-64A or FPG101 for AH-64D,
Hover, 60, 80, 100, 120, or 140 Knots). Press DO. Verify that the aircraft is steady in selected condition and
press DO to initiate measurement.
The next screen will indicate that measurement is in progress.
g. Following successful measurement, the limits screen will appear to display all measurements that exceed limits.
This information can be useful in determining whether or not to proceed to the next flight condition. Use the up
cursor to display all measurements relative to limits.
h. Press QUIT to exit the limits screen and return to the measurement screen. The next Test State will be
highlighted. Press DO twice to start measurement and repeat until all flight conditions have been obtained, or
until vibration and/or track precludes advancing to the next higher speed.
If main rotor 1/REV vibration becomes objectionable,
acquire data normally through the highest airspeed
at which vibration can be tolerated. Do not skip test
conditions, data should be taken from ground to the
highest airspeed possible. After data is taken at the
highest airspeed achieved, press QUIT then
highlight Save and Exit and then press DO. Land the
aircraft and perform corrections suggested by the
CADU prior to further flight.
Autorotation RPM verification should be done as soon as
the aircraft is capable of a forward airspeed of 80 to 100
knots. Autorotation adjustments may disturb track and
If any Test State has a failed or partial message next
to the prompt or the AVA did not get a complete set of
data for this Test State. Arrow back to the Test State
and repeat the measurement until all Test States have
done next to them.
If the tracker is pointed towards the sun, the AVA may
give a tracker error and may indicate partial next to the
measurement condition. Re-orient the aircraft away
from the sun, and repeat the measurement for that
Prior to initiating diagnostics, it may be helpful to review
the measured data so that the diagnostic solution can be
better interpreted and adjusted (see procedure 3 below).
g. Exit measurement mode:
a.) If measurements have been acquired for all seven flight conditions, the measurement screen will automatically
exit. Highlight Finish and press DO. Highlight Diagnostics and press DO.