Textron Bell 412, Maintenance Manual

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BHT-412-MM-2
5-00-00
26 FEB 2013 Rev. 16 Page 41 Export Classification C, ECCN EAR99
a. Universal bearings for looseness.
b. Input lever bearings and bolts for wear and looseness.
c. Fasteners attaching cylinder lower supports to structure
for looseness.
d. Cylinder lower bearings for looseness.
e. Actuator assemblies for condition, leakage, and
security.
f. Cylinder extension tubes for condition and security.
g. Upper cylinder housing mounting bracket for condition
and security. Check mounting bracket cavity for corrosion.
Cavity drain hole for obstruction. Dust boot for condition.
Reapply corrosion preventive compound (C-104) as required.
h. Actuator linkage for wear and security.
i. Clean exposed area of actuator piston with hydraulic
fluid (C-002) or hydraulic fluid (C-072) and lint-free cloth.
j. Check cyclic and collective hydraulic cylinders’ piston
rods for evidence of excessive wear and scoring. Wear of the
piston rods indicates cylinder assembly is incorrectly aligned to
lower supports and requires adjustment.
4. Antitorque controls check:
a. Inspect tail rotor control tubes, bellcranks, supports, and
attaching hardware between tail rotor pedals and tail rotor
gearbox for corrosion, wear, and damage.
b. Inspect tail rotor hydraulic actuator for leaks, security of
attachment, damage, corrosion, wear, bearings, and linkages
for looseness.
Every third 100 hour inspection (300 hours) or 12 months:
1. Collective and cyclic flight control actuators:
SCHEDULED INSPECTIONS
5-6. 100 HOUR/12 MONTH INSPECTION — PART A (CONT)
DATA REFERENCE INSPECTION TASK DESCRIPTION
INITIAL
MECH OTHER