BHT-412-MM-2
5-00-00
26 FEB 2013 Rev. 16 Page 67
Export Classification C, ECCN EAR99
Chapter 67 e. Check elevator attachment lugs at each end of elevator
horn for cracks, corrosion, and security.
f. Check elevator horn to elevator spar attaching bolts
and surrounding joint for cracks, corrosion, and security.
g. Check elevator control tube, support, attaching
hardware, and surrounding structure, for corrosion, damage,
and security.
Chapter 65 h. Torque check tail rotor gearbox mounting nuts by
applying torque in tightening direction, do not exceed
200 inch-pounds (22.6 Nm). If any nut rotates under torque,
inspect attachment hardware and tail rotor gearbox for
serviceability.
i. Torque check intermediate gearbox mounting bolts by
applying torque in tightening direction, do not exceed
50 inch-pounds (5.65 Nm). If any bolt turns under torque,
inspect attachment hardware and intermediate gearbox for
serviceability.
Step 7 pertains to helicopters S/N 33001 through
33213 and 36001 through 36019 not modified by
412-570-001-103 or Pre BHT-412-SI-74 (412SP to
412HP Upgrade).
Chapter 65 7. Tail rotor driveshaft:
CAUSE OF ANY DISCOLORATION SHALL BE
DETERMINED AND CORRECTED PRIOR TO
NEXT FLIGHT.
5-9. 25 HOUR/30 DAY INSPECTION — PART B (CONT)
DATA REFERENCE INSPECTION TASK DESCRIPTION
INITIAL
MECH OTHER
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