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TM 1-6625-724-13&P
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The OH-58 A/C Flight Plans are listed below with a brief description of their purposes. The selectable Flight Plans
(see table 1) are listed in order of appearance in the menu on the CADU and not in the order in which they are to be
performed.
FLIGHT
This test is primarily designed to reduce the in flight vertical vibrations using pitch links, sweep, tab, and weight. It is
to be used after the GNDTRK and INITIAL flight plans when smoothing an aircraft after component change, or for
"tuning up" an aircraft that is already in service.
GNDTRK
This flight plan is designed to get the rotor into a flyable track prior to hovering. It consists of two measurements, and
will adjust pitch links only. It should be the first test that is performed after any component change or major rework on
the rotor.
INITIAL
This flight plan is performed after the GNDTRK, and will balance the rotor prior to flight. It will adjust pitch links,
weights, and sweep to perform this goal. This test may be performed first if the status of the rotor components is
known (i.e., the same pitch links and blades were re-installed after a phase).
PROBES
This flight plan is designed to acquire data from up to four accelerometers to assist in isolating irregular or unusual
vibrations. The flight plan will measure data one channel at a time on DAU ACC1 through ACC4. These
accelerometers may be installed anywhere on the airframe and will measure a 0 to 500 Hz spectrum (0 to 30,000
RPM). Operator must denote orientation and location of accelerometer.
TAIL
This flight plan is designed to balance the OH-58 A/C tail rotor. It uses the optical RPM sensor on TACHO 2 and one
accelerometer on ACC4. It should be performed after any rework on the tail rotor or anytime a medium to high
frequency vibration is felt in the aircraft.
