Figure 9. Tail Rotor Reflective Tape
f. Proper alignment of the tape can be verified by applying AC power to the DAU and rotating the tail rotor until
the taped blade passes in front of the optical RPM sensor. A red LED on the back of the sensor will light if the
sensor picks up a return from the reflective tape.
PROCEDURE 4: PERFORM TAIL MEASUREMENT
a. Operate aircraft at 324 Rotor RPM.
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.
Use cursor keys to highlight UH1 or UH1CRB, and then press DO.
g. Tail Number is highlighted. Press DO.
h. Use cursor keys to highlight a tail number or enter a new tail number (up to seven digits), then press DO.
Flight Plan is highlighted. Press DO.
Use cursor keys to highlight tail. Press DO.
k. Enter the MEASURE mode by pressing F1. Verify that fpgtl is selected.
Press DO when the aircraft is stable at the highlighted selection. Verify that the aircraft is at the required Test
State and press DO again. The AVA will acquire track and vibration data and return to the selection menu.
m. After the measurement is completed, press DO on Finish, then press DO on Diagnostics. If measurements are
within specified limits, press QUIT to Main Menu and proceed to step r.
n. If measured values exceed specifications, press DO to enter the DIAGS mode.