Textron Bell 412, Maintenance Manual

Page: 249 / 288

BHT-412-MM-2
5-00-00
01 JUN 2018 Rev. 26 Page 201 Export Classification C, ECCN EAR99
(b) Perform a close visual inspection of the tail
rotor rotating controls. If no evidence of damage is found, the
tail rotor rotating controls may remain in service. Replace all tail
rotor rotating controls bolts. If damage to the tail rotor rotating
controls is found, perform overhaul of the tail rotor rotating
controls. Make an entry in the component record to show that
reason for the removal is sudden stoppage.
(c) Remove output shaft case (sleeve assy) from
tail rotor gearbox. Visually inspect input pinion and bevel gear
for indication of sudden stoppage. Any indication or damage
found will require overhaul of tail rotor gearbox. Make an entry
in the component records to show reason for removal is a
sudden stoppage.
(d) Remove intermediate gearbox input and
output quill. Visually inspect pinion for indication of a sudden
stoppage. Any indication or damage found will require overhaul
of the intermediate gearbox. Make an entry in the component
records to show reason for removal is a sudden stoppage.
(4) If the inspection is being conducted as a result of
a tail rotor driveshaft, intermediate gearbox or tail rotor gearbox
assembly induced torque spike, an overhaul evaluation of the
tail rotor hub and blade assembly shall be performed. Make
and entry in the component record to show reason for removal
is a sudden stoppage.
(5) If the inspection is being conducted as a result of
the Main rotor strike or transmission induced torque spike, the
tail rotor hub and blade assembly may remain in service
provided there is no visible damage. If visible damage is noted
on tail rotor hub and blade assembly, an overhaul evaluation of
the tail rotor hub and blade assembly shall be performed. Make
an entry in component record to show reason for removal is a
sudden stoppage.
NOTE
If you replace driveshafts or hanger bearing
assemblies because of the results in step (b)
through (c), do a detailed visual inspection of the
hanger bearing support structure for cracks, loose or
sheared rivets and elongated holes.
CONDITIONAL INSPECTIONS
5-38. SUDDEN STOPPAGE — POWER ON OR OFF (CONT)
DATA REFERENCE INSPECTION TASK DESCRIPTION
INITIAL
MECH OTHER