0071 00
TM 1-6625-724-13&P
0071 00-4
FLIGHT
Minimizes main rotor lateral vibration during ground/hover and vertical vibration at 60, 80, 100, 120 and 140 Knots.
Secondary emphasis is placed on minimizing ground, hover and forward flight track spread. As default, the
diagnostics will use pitch links to influence ground/hover lateral vibration/track and forward flight vertical
vibration/track. Trim tabs are used to influence forward flight vertical vibration/track. Weights must be manually
turned on using (Edit Adjustables) to influence ground/hover lateral vibration and forward flight vertical vibration.
Success depends upon having a good GROUND track and balance starting point.
GROUND
Minimizes both main rotor track and lateral vibration at 100% (101% for AH-64D) Nr flat pitch (full down collective)
using main rotor pitch links and weights. Weights are turned OFF as default and must be manually turned on (Edit
Adjustables) as necessary to achieve good ground balance. If the aircraft is already in service and the operator
desires to improve the vibration levels do not perform the GROUND task.
PROBES
Acquires data from up to four accelerometers (in addition to the two on-board track and balance accelerometers) to
assist in isolating irregular or unusual vibrations.
tail
Minimizes tail rotor vibration on the ground with main rotor at 100% (101%for AH-64D) Nr flat pitch using tail rotor
blade tip weights. Also requires installation of the accelerometer, accelerometer cable, and optical rpm sensor with
accompanying blade reflective tape. For this measurement, the tail rotor accelerometer is connected to DAU
receptacle “ACC4” and the optical tachometer cable to DAU receptacle “TACHO2”.
tail70
Same as tail, but for flat pitch on ground at 70% Nr. This flight plan should be used for tail rotor balance whenever tail
rotor vibration levels preclude safe rotor operation at 100% (101% for AH-64D) Nr. The AVA will give a correction
based on sensitivity coefficients for the 70% condition. Further iteration at 70% may be necessary until 100% (101%
for AH-64D) can be safely achieved, however, it is not necessary to minimize vibration at 70% before attempting
100% (101% for AH-64D).
GENERAL GUIDELINES
The last page of this appendix gives general guidelines for AH-64 track and balance for the GROUND and FLIGHT
flight plans in a single page. It is intended as a refresher for the experienced user who has previously read and
understood the detailed contents, which follow. The inexperienced operator should read and understand the more
detailed text of the main body of this document before relying on the brief general guidelines contained at the end of
this work package.
