Textron Bell 412 - Page 206

BHT-412-MM-2
5-00-00
Page 158 Rev. 23 15 DEC 2015
Export Classification C, ECCN EAR99
12. Assemble main rotor mast assembly.
13. Install torquemeter tube assembly and plug.
a. For mast assemblies 412-040-366-109, Bell Helicopter
will align the spline teeth in the torquemeter tube assembly
relative to those in the lower torquemeter rotor. The alignment
procedure used for the spline teeth depends on the serial
number of the mast assembly and the part number of the
monopole sensor used with the mast assembly.
b. For mast assemblies 412-040-366-111 and
subsequent, align the spline teeth in the torquemeter tube
assembly relative to the spline teeth in the lower torquemeter
rotor using tool 412-240-028-101.
14. Install main rotor mast assembly.
SPECIAL INSPECTIONS
5-30. EACH 2500 OR 3000 HOURS OF MAIN ROTOR MAST
(412-040-366-109 AND SUBSEQUENT) OPERATION (CONT)
DATA REFERENCE INSPECTION TASK DESCRIPTION
INITIAL
MECH OTHER