Textron Bell 412, Maintenance Manual

Page: 248 / 288

BHT-412-MM-2
5-00-00
Page 200
Rev. 23 15 DEC 2015 Export Classification C, ECCN EAR99
NOTE
In all cases ensure damage limits are adhered to.
(1) Inspect tail rotor static stop for yielding as noted in
Chapter 64 to determine if tail rotor yoke assembly may have
been exposed to bending. Check for straightness across static
stop P/N 212-011-713 outboard surface. If yielding has
occurred, scrap the tail rotor yoke and static stop.
(2) If a sudden stoppage incident was confirmed as a
result of impact damage to the leading edge exceeding limits
specified in chapter 64, the tail rotor hub and blade assembly
shall be considered scrap and the following components shall
be overhauled. Make an entry in the component records to
show reason for removal is sudden stoppage.
(a) Tail rotor gearbox assembly.
• If during the overhaul; cracks, sheared or bend studs or
evidence of case distortion are found the gearbox is
unserviceability and nonrepairable and shall be
scrapped.
(b) Intermediate gearbox assembly.
• If during overhaul; cracks, case distortion or broken
lugs are found, the gearbox is unserviceable and
non-repairable and shall be scrapped.
(c) Tail rotor driveshaft hanger assemblies
(d) Tail rotor rotating controls.
(3) If a sudden stoppage incident was confirmed but
blade damage is confined to skin compression, wrinkling
directly behind the spar, perform the following:
(a) Overhaul tail rotor hub assembly. Scrap or
repair tail rotor blades.
CONDITIONAL INSPECTIONS
5-38. SUDDEN STOPPAGE — POWER ON OR OFF (CONT)
DATA REFERENCE INSPECTION TASK DESCRIPTION
INITIAL
MECH OTHER