TM 1-6625-724-13&P
0069 00
0069 00-15
TASK 4 - MAIN ROTOR ROLL/VERTICAL IN-FLIGHT TUNING
CAUTION
If tail rotor requires balancing, task 6 (Balance Tail
Rotor) should be accomplished before flight.
Main rotor in-flight roll/vertical tuning should be performed when any of the following occur:
Main rotor 1/REV (258 RPM) in-flight vibration is unacceptable.
Main rotor maintenance was done and ground flat pitch tracking was performed, see task 2.
PROCEDURE 1: EQUIPMENT INSTALLATION
NOTE
If major maintenance has been accomplished that
requires rotor smoothing, tasks 2 & 3 should be
accomplished prior to starting this task. If no
maintenance has been previously accomplished then
start at task 4.
a.
Install test equipment, see task 1.
b.
Turn on DAU.
c.
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, then press DO.
c.
Use cursor keys to highlight UH-60, and 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 digits), then press DO.
f.
Flight Plan is highlighted. Press DO.
g.
Use cursor keys to highlight FLIGHT. Press DO.
h.
Enter the Measure mode by pressing F1. Verify that Test State FPG100 is highlighted.
WARNING
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 speed 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.
i.
Press DO when the aircraft is stable at the highlighted selection. Verify that the aircraft is at the required Test
State (FPG100, Hover, 80 Kts, 120 Kts, or 145 Kts) and press DO again. Perform this operation each time a
