BHT-212-MM-1
5-00-00
26 JUN 2013 Rev. 14 Page 221
Export Classification C, ECCN EAR99
e. If main rotor blades, main rotor hub, main driveshafts, or
tail rotor output coupling exhibit evidence of damage that can be
attributed to a lightning strike, remove transmission and mast
assembly for overhaul. Tag components stating lightning strike
as reason for removal. If no evidence of damage is noted on
above mentioned components, partially remove and inspect
main transmission as follows:
Chapter 63 (1) Remove and inspect all transmission chip
detectors.
(2) If any evidence of arc burning or pitting is noted, or
excessive debris is found, remove transmission and mast
assembly for overhaul. Tag components stating lightning strike
as reason for removal.
Chapter 63 (3) If no evidence of arc burning or pitting is noted,
ground run light on skids for 1 hour. Reinspect chip detectors
and remove and inspect oil filter. Repeat these inspections after
accumulating 5 flight hours but prior to 10 flight hours.
f. Inspect tail rotor blades and hub. Scrap blades if
indications of burns or debonding are present. Remove tail rotor
hub for overhaul. Tag hub stating lightning strike as reason for
removal.
Chapter 65 g. Remove and inspect tail rotor gearbox chip detector
and intermediate gearbox chip detector.
h. If the tail rotor blades, tail rotor hub, or tail rotor output
coupling exhibit evidence of damage, which can be attributed to
a lightning strike, or excessive debris is found on chip detectors,
remove tail rotor gearbox, intermediate gearbox and tail rotor
driveshaft hangers for overhaul. Tag components stating
lightning strike as reason for removal. Additionally, the tail rotor
driveshaft tubes, disc pack couplings, and attaching hardware
shall be visually inspected for evidence of arc burns or pitting.
Any evidence of arc burns or pitting is cause for rejection.
i. If no evidence of arc burns or pitting is noted, operate
helicopter light on skids for 1 hour. Reinspect chip detector.
Repeat this inspection after accumulating 5 flight hours but prior
to 10 flight hours.
5-55. AFTER LIGHTNING STRIKES (CONT)
DATA REFERENCE INSPECTION TASK DESCRIPTION
INITIAL
MECH OTHER
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