Bell 206L4 Maintenance Manual page 214

BHT-206L4-MM-1
5-56. LIGHTNING STRIKE (CONT)
DATA REFERENCE
BHT-206L-CR&O
BHT-206L-CR&O
BHT-206L-CR&O
5-00-00
Page 178 Rev. 18 7 JUN 2013
CONDITIONAL INSPECTIONS
INSPECTION TASK DESCRIPTION
(2) Visually check pitch horns and trunnion bearing
connections for arcing burns.
(3) If indications of arcing or burning are present,
overhaul main rotor hub assembly and scrap pitch links and all
attaching hardware.
(4) If no indications are found, reassemble main rotor
hub.
b. Remove main rotor mast assembly. Without removing
bearing from mast, inspect visible portions of the bearing for
signs of electrical arcing or burning. Rotate bearing during
inspection. Check bearing for smooth rotation. Visually inspect
the lower mast bearing race and driving spline on the mast for
signs of arcing or burning. If indications of arcing, burning, or
roughness of the bearing are present, transmission, mast
assembly, and freewheel assembly shall be returned for
overhaul. State lightning strike as reason for removal.
c. Remove transmission top case and inspect for entry
and exit of lightning strike. Special attention should be given to
the planetary pinion and sun gear, ring gear, spiral bevel gear,
and quill pinion. Check all bearings for smooth rotation and
damage. If evidence of arcing or burning is found or bearings do
not rotate smoothly, remove gearbox and return for overhaul,
stating lighting strike as reason for removal. Scrap all parts that
exhibit signs of arcing.
(1) If no indications of arcing are found, reassemble
transmission and mast assembly and return to limited service.
(2) After 5 hours, remove the chip detectors and filter
and inspect for chips.
(a) If no chip indications are found, return
transmission to full service.
(b) If chip
transmission, mast assembly, and freewheel assembly and
return for overhaul. State lightning strike as reason for removal.
Scrap all parts that exhibit signs of arcing.
indications are found,
Export Classification C, ECCN EAR99
INITIAL
MECH OTHER
remove