BHT-412-MM-2
5-00-00
Page 220 Rev. 19 30 AUG 2013
Export Classification C, ECCN EAR99
a. Remove and visually inspect main rotor blades. If
blades show any of the following indications, send the blades to
a Bell Helicopter Textron approved blade repair facility for
evaluation. State lightning strike as reason for removal.
(1) Inspect blades for signs of burns. Burn marks can
be very minute.
(2) Inspect blades for debond in all bonded areas.
b. Remove main rotor hub for overhaul. State lightning
strike reason for removal. Inspect main rotor hub and rotating
controls for indication of arcing or burning.
c. Remove main driveshaft for inspection.
BHT-412-CR&O (1) Disassemble to extent required for cleaning and
repacking coupling.
(2) Clean coupling.
(3) Visually inspect couplings for any evidence of arc
burning or pitting. Pay special attention to tips, roots, and
profiles of male and female coupling teeth. Any evidence of arc
burning or pitting is cause for rejection.
(4) Repack coupling.
d. Remove tail rotor output coupling for inspection.
BHT-412-CR&O (1) Disassemble to extent required for cleaning and
repacking coupling.
(2) Clean coupling.
(3) Visually inspect couplings for any evidence of arc
burning or pitting. Pay special attention to tips, roots, and
profiles of male and female coupling teeth. Any evidence of arc
burning or pitting is cause for rejection.
(4) Repack coupling.
5-42. AFTER LIGHTNING STRIKES (CONT)
DATA REFERENCE INSPECTION TASK DESCRIPTION
INITIAL
MECH OTHER
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