Textron Bell 412, Maintenance Manual

Page: 65 / 288

BHT-412-MM-2
5-00-00
26 FEB 2013 Rev. 16 Page 33 Export Classification C, ECCN EAR99
11. Inspect cabin roof structure:
a. Cabin roof structure, cowlings, and fairing for damage,
delamination, and general condition.
b. Cabin roof and cowling/fairing mounted antennas for
condition and security.
Every sixth 100 hour inspection (600 hours) or 12 months:
1. Inspect fuselage cabin structure:
a. Fuselage structure for corrosion and damage to finish
and sealant. Pay particular attention to edges of joints and
seams and around fastener heads.
b. Engine compartment floor and service deck, FS 155.06
to 241.22, for damage, delamination, and corrosion.
NOTE
To adequately inspect the following, it will be
necessary to remove the auxiliary fuel tanks if
installed.
2. Pylon wall for damage, working fasteners, cracks,
delamination, and corrosion.
Chapter 53 TAILBOOM
1. Inspect tailboom attachment points for cracks and security.
2. Inspect tailboom exterior and interior structure for corrosion
and damage.
3. Ensure all drain holes are open.
Chapter 65 4. 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.
SCHEDULED INSPECTIONS
5-6. 100 HOUR/12 MONTH INSPECTION — PART A (CONT)
DATA REFERENCE INSPECTION TASK DESCRIPTION
INITIAL
MECH OTHER