BHT-212-MM-1
5-00-00
Page 200 Rev. 14 26 JUN 2013
Export Classification C, ECCN EAR99
BHT-212-CR&O e. Remove and inspect main driveshaft visually. If
evidence of yielding or deformation is noted, scrap driveshaft
assembly and attaching bolts. If no visual evidence of damage
is detected, perform an overhaul evaluation. Make an entry in
component record to show reason for removal and sudden
stoppage.
f. Transmission and mast assembly.
(1) The following criteria are established to determine
the need for removal and overhaul of the transmission and mast
assembly. If any doubt exists contact Product Support
Engineering.
(a) Damage to the main rotor blades due to
striking a foreign object requiring removal to repair or scrap
blades.
(b) Damage to the main rotor hub due to the main
rotor blades striking a foreign object.
(c) Damage or shearing of main rotor mast.
(d) Seizure of drive system components.
The transmission and mast assembly must be
evaluated for serviceability as a set when removed
for inspection requirements due to sudden stoppage.
Inspect in accordance with the BHT-212-CR&O
manual, ensuring both conditional and normal
inspections are accomplished.
BHT-212-CR&O
If mast has evidence of torsional yielding (defined as
excessive runout, bending, deformation or spline
misalignment), mast assembly (including mast
bearing), transmission top case, transmission lower
planetary spider, lower mast bearing, and pylon
mounts shall be scrapped. The transmission shall be
overhaul evaluated. If the main case is magnesium it
shall be scrapped.
5-51. AFTER BLADE STRIKE OR OTHER ROTATING SYSTEM TORQUE SPIKE (CONT)
DATA REFERENCE INSPECTION TASK DESCRIPTION
INITIAL
MECH OTHER
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