Textron Bell 412, Maintenance Manual

Page: 111 / 288

BHT-412-MM-2
5-00-00
26 FEB 2013 Rev. 16 Page 75 Export Classification C, ECCN EAR99
b. Hydraulic lines for leaks, chafing, and kinking.
c. Hydraulic system 1 and 2 reservoirs for proper fluid
levels, damage, corrosion, and security.
Chapter 62 5. Main rotor blades:
a. Wash main rotor blades.
b. Main rotor blades for condition, damage, and security.
NOTE
Waxing is not required for blades 412-015-300-109
and subsequent or for any blade finished with
polyurethane paint.
c. Apply a coat of wax to main rotor blades.
Chapter 62 6. Main rotor hub:
a. Inspect hub assembly for condition, corrosion, and
security, paying particular attention to the integrity of sealing.
b. Inspect pitch horns for condition, security, and
corrosion and cracks in areas surrounding torque transfer pin
holes. No cracks permitted.
c. Inspect pivot bearings, spindle bearings, and damper
set for elastomeric bearing delamination, elastomer
degradation, shim cracks, crazing, cracking, or sheeting.
d. Inspect damper bearing bumper pads for deterioration
or deformation due to contact with yoke.
e. Functionally check arm and bearing (pendulum)
assemblies. Apply a minimum of 5 pounds (22.24 N) of axial
force to each arm and bearing assembly. Cycle arm and
bearing through full travel.
f. Apply force away from center of yoke. Arm and bearing
assembly should cycle free and smooth. Roughness and
binding are not acceptable.
SCHEDULED INSPECTIONS
5-9. 25 HOUR/30 DAY INSPECTION — PART B (CONT)
DATA REFERENCE INSPECTION TASK DESCRIPTION
INITIAL
MECH OTHER