Figure 7. Reflective Tape Installation
PROCEDURE 4: PERFORM TAIL MEASUREMENT
a. Operate aircraft at appropriate rotor speed.
b. Turn on DAU.
c. Turn on CADU.
d. Press QUIT on the CADU until all selections are undefined.
e. Use cursor keys to highlight Aircraft Type, and then press DO.
f. Select aircraft type OH-58D. Press DO.
f. Tail Number is highlighted. Press DO.
g. Use cursor keys to highlight a tail number or enter a new tail number (up to seven digits), then press DO.
h. Flight Plan is highlighted. Press DO.
i. Use cursor keys to highlight Tail. Press DO.
j. Enter the Measure mode by pressing F1. Verify that 90% NR is selected.
k. Press DO when the aircraft is stable at the highlighted selection. The first time the DO key is pressed, the
system performs a self-test of all installed equipment and readies the DAU to acquire data for that Test State
(the CADU will prompt the operator with an asterisk and test condition when all equipment is ready). Re-verify
that the aircraft is at the required Test State (90% NR and 100%NR) and press DO again. Perform this
operation each time a measurement is completed and another Test State is highlighted. The AVA will acquire
track balance data and return to the selection menu.
l. After the last measurement is completed, press DO on Finish, then press DO on Diagnostics. If measurements
are within specified limits, press QUIT to Main Menu. Proceed to step q.
m. If measured values exceed specifications, press DO to execute diagnostics. AVA will make a recommendation
to correct balance using spanwise (outboard blade bolt) weights and/or chordwise (trunnion balance arm)
weights. Shut down the aircraft and use the recommended correction provided by the diagnostics.
n. After each set of adjustments and verification run it is recommended to use the Trend Flights display (see
chapter 2, Displays WP 0010) to view the tail vibration. Vibration should be decreasing and moving towards the
center of the polar plot. If not check for mechanical problems.
p. Repeat the procedure until the tail rotor balance is below 0.2 ips.
q. Once acceptable vibration levels have been obtained, remove all test equipment from aircraft and make
appropriate log entries.