TASK 4 BALANCE TAIL ROTOR
Figure 15. Tail Accelerometer Cable Routing
PROCEDURE 4: PERFORM TAIL ROTOR BALANCE MEASUREMENT
To achieve an accurate measurement, ensure tail rotor
pedals are centered (flat pitch) during ground run.
If severe vibration prevents obtaining 100% (101% for
AH-64D) Nr rotor speed, use the tail70 flight plan and
take the measurement at 70% Nr. The AVA diagnostic
solution for tail70 incorporates coefficients specifically for
the 70% Nr condition. Repeat balance measurement/
correction at 70% Nr until 100% (101% for AH-64D) Nr
can be safely achieved. Completion of tail70 does not
eliminate the requirement for the balance at 100%
(101% for AH-64D) Nr.