BHT-206A/B-SERIES-MM-1
5-00-00
Page 166 Rev. 14 30 APR 2013
Export Classification C, ECCN EAR99
If a tail rotor driveshaft has failed as a result of
torsional overload, the forward short shaft, the aft
short shaft, the fan shaft, the impeller, all hangers,
driveshafts, adapters, and disc couplings shall be
considered unserviceable and scrapped. Inspect
hanger attachment points for cracks and distortion.
Overhaul tail rotor gearbox to ensure airworthiness.
If a tail rotor driveshaft has been damaged by main
rotor strike or damaged other than torsional
overload, all tail rotor driveshafts, plus hanger
assemblies, adapters, and disc couplings fore and aft
of damaged area shall be considered unserviceable
and scrapped. Inspect remaining hanger assemblies,
adapters, and disc couplings according to step m
and step n. Inspect hanger attachment points for
cracks and distortion.
Chapter 65 l. Inspect tail rotor driveshafts for condition. If any defect
is detected to one driveshaft, scrap all bonded tail rotor
driveshafts. If any defect is detected, scrap the defective riveted
tail rotor driveshaft.
m. Inspect steel tail rotor driveshaft and steel adapters for
cracks using magnetic particle inspection method.
n. Inspect tail rotor driveshaft hangers, disc couplings, and
aluminum driveshaft adapters using fluorescent penetrant
inspection method.
4. In addition to step l and related notes, all bonded tail rotor
driveshafts shall be considered unserviceable and scrapped, if
during a sudden stoppage/acceleration inspection, any of the
following conditions that are attributable to sudden stoppage/
acceleration are noted:
• Any impact damage to a main rotor blade leading edge
or lower skin, or any main rotor blade skin buckling or
tears
• Main rotor mast is sheared, power on or off, or with
torsional yielding, or Total Indicated Runout (TIR) check
exceeds limits
5-53. SUDDEN STOPPAGE/ACCELERATION — MAIN ROTOR — POWER ON OR OFF (CONT)
DATA REFERENCE INSPECTION TASK DESCRIPTION
INITIAL
MECH OTHER
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