TASK 4 - TRACK MAIN ROTOR IN FLIGHT
PROCEDURE 1: EQUIPMENT INSTALLATION
The preferred method of tracking the OH-58D is tracking it with the MMS installed. Removing the sight and working
the rotor until smooth and then reinstalling the sight is considered an obsolete method and could result in high
vibration levels at idle RPM when the sight is reinstalled. Working the rotor with the sight installed and using the OH-
58DM script file will preclude from having high vibration levels at idle RPM.
Aircraft ground track and balance specified requirements
(tasks 2 and 3) are to be completed prior to performing
in-flight Test States, unless aircraft is already in service.
a. Install test equipment (refer to task 1).
b. Operate aircraft at appropriate rotor speed (see table 1 or table 2).
c. Turn on DAU.
d. Turn on CADU.
PROCEDURE 2: PERFORM FLIGHT MEASUREMENT
a. Press QUIT on the CADU until all selections are undefined.
b. Use cursor keys to highlight Aircraft Type. Press DO.
c. Select OH-58D for aircraft without MMS and OH-58DM for those aircraft with MMS, then press DO.
d. Tail Number is highlighted. Press DO.
e. Use cursor keys to highlight a tail number or enter a new tail number (up to seven characters), then press DO.
Flight Plan is highlighted. Press DO.
g. Use cursor keys to highlight flight plan FLI-SG. Press DO.
h. Enter the Measure mode by pressing F1.
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). Reverify
that the pilot is at the required Test State (65% NR, 35% TQ, Hover, 60K, 100K, 110K, and L/DOWN for
OH-58D aircraft or 65%NRC, 35% TQ, Hover, 60K, 100K, 110K, and L/DOWN for OH-58DM aircraft) and
press DO again. Perform this operation each time a measurement is completed and another Test State is
highlighted. The AVA will acquire track data and return to the selection menu.
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, then proceed to step p.
If Main Rotor RPM cannot be maintained in the
normal operating range, terminate test flight.
k. Perform autorotational check as per TM 55-1520-248-MTF.
If measured values exceed specifications, press DO to execute diagnostics. AVA will make recommendations
to correct track and balance using trim tabs, and hub balance weights. Shut down aircraft and make