to be carried out within 5 hours:-
A mistaken value of the tightening torque of the tail rotor special hub plug P/N 109-0133-18-103 has been discovered in the Maintenance Manual of A109A and A109AII helicopters.
The investigation carried out by Agusta has revealed that the wrong value of the tightening torque was introduced with the revision 9 of the A109A and A109AII Helicopter Maintenance Manual dated 15 June 2009. This condition, if not corrected, could ultimately lead to tail rotor failure.