Bell 206L4 Maintenance Manual page 186

BHT-206L4-MM-1
5-51. SUDDEN STOPPAGE/ACCELERATION — MAIN ROTOR (CONT)
DATA REFERENCE
BHT-206L-CR&O
5-00-00
Page 150 Rev. 16 1 JUN 2012
CONDITIONAL INSPECTIONS
INSPECTION TASK DESCRIPTION
h. Main driveshaft must be considered unserviceable and
scrapped.
i. lnspect transmission restraint and transmission mount
system for condition, and fuselage attachment points for cracks.
j. lnspect engine mounts at fuselage attachment points for
cracks.
If a tail rotor driveshaft failed as a result of torsional
overload, ALL hangers,
impellers, and disc couplings shall be considered
unserviceable and
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 damage other than torsional overload,
ALL bonded tail rotor driveshafts, plus the hanger
assemblies, adapters,
fore-and-aft of the damaged area shall be considered
unserviceable and scrapped. Inspect remaining
hanger assemblies, adapters, and disc couplings
according to step l and step m. Inspect hanger
attachment points for cracks and distortion.
k. Inspect tail rotor driveshafts for out of roundness, and
distortion or bowing exceeding the limits specified. If any defect
is detected, scrap all bonded tail rotor driveshafts.
l. lnspect steel tail rotor driveshaft and all steel adapters
for cracks using magnetic particle inspection method.
m. Inspect tail rotor driveshaft hangers, disc couplings, and
aluminum driveshaft adapters using fluorescent penetrant
inspection method.
4. In addition to step l, step m, 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 the
sudden stoppage/acceleration are noted:
NOTE
driveshafts, adapters,
scrapped. Inspect hanger
and disc couplings
INITIAL
MECH OTHER
ECCN EAR99