Textron Bell 412 Maintenance Manual page 272

BHT-412-MM-2
5-42. AFTER LIGHTNING STRIKES (CONT)
DATA REFERENCE
Chapter 63
BHT-412-CR&O
5-00-00
Page 222 Rev. 19 30 AUG 2013
CONDITIONAL INSPECTIONS
INSPECTION TASK DESCRIPTION
3. If no visual indications of damage are present, proceed as
follows:
a. Remove and inspect all transmission chip detectors.
(1) If excessive debris is found on chip detectors,
remove transmission and mast assembly for overhaul.
(2) If little or no debris is found, ground run light on
skids for one hour. Reinspect chip detectors.
b. Remove and inspect oil filter.
c. Repeat these inspections after accumulating 5 flight
hours but prior to 10 flight hours.
4. Prior to first flight after a suspected or confirmed lightning
strike, verify proper function of all drive system component chip
detectors as follows:
a. Remove electrical connector from chip detector.
b. Remove chip detector and reinstall connector.
c. With electrical power applied to helicopter systems,
bridge chip detector gap with a clean screwdriver or other clean
conductive object.
d. Verify proper indication on caution panel. Verify
illumination of MASTER CAUTION light.
e. Perform repairs as required.
5. When it has been established lightning has struck
helicopter, inspections of electrical and instrument systems that
follow are mandatory to ensure safety of flight:
a. Inspect all electrical wiring, bundles, and connectors
for burning or electrical arcing. Unplug all connectors and
inspect pins and housing for electrical arcing or burning.
Inspect interior of all circuit breaker panels for burning or
electrical arcing. Replace any wires, connectors, or circuit
breakers found to be damaged.
MECH
Export Classification C, ECCN EAR99
INITIAL
OTHER