BELL HELICOPTER 430 Maintenance Manual page 175

5-50. LIGHTNING STRIKE (CONT)
DATA REFERENCE
BHT-430-CR&O-2
CONDITIONAL INSPECTIONS
INSPECTION TASK DESCRIPTION
(4) Assemble the main rotor if you did not find any
damage.
b. Remove the main rotor mast assembly. Do not remove
the bearing from the mast. Examine the parts of the bearing that
you can see for signs of electrical arcs or burns. Turn the
bearing as you examine it. Make sure the bearing turns
smoothly. Examine the lower mast bearing race and the drive
spline on the mast for signs of arcs or burns.
(1) If you find signs of arcs or burns on the bearing or
if the bearing turns roughly, remove the transmission and mast
assembly and return it for overhaul. Make an entry in the
component record to show that the reason for removal was a
lightning strike.
(2) If you can not find any signs of damage, assemble
the transmission and mast assembly and return them to limited
service. After 5 hours, remove the chip detectors and the filter
and examine for metal particles. If you do not find any metal
particles, return the transmission to full service. If you do find
metal particles, remove the transmission and mast assembly
and return it for overhaul. Make an entry in the component
record to show that the reason for removal was a lightning
strike.
c. Remove the output quill assembly from the tail rotor
gearbox. Examine the gear teeth for signs of electrical arcs or
burns. Make sure that the bearing turns smoothly.
(1) If you find arcs or burns on the bearing or if the
bearing turns roughly, remove the gearbox and return it for
overhaul. Make an entry in the component record to show that
the reason for removal was a lightning strike.
(2) If you can not find any signs of damage, assemble
the gearbox and return it to limited service. After 5 hours,
remove the chip detectors and examine for metal particles. If
you do not find any metal particles, return the gearbox to full
service. If you do find metal particles, remove the gearbox and
return it for overhaul. Make an entry in the component records
to show that the reason for removal was a lightning strike.
26 JAN 2007 Rev. 15
BHT-430-MM-2
INITIAL
MECH OTHER
5-00-00
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