BHT-407-MM-1
5-00-00
ECCN EAR99
CONDITIONAL INSPECTIONS
5-32. AFTER LIGHTNING STRIKE
DATA REFERENCE
INSPECTION TASK DESCRIPTION
INITIAL
MECH OTHER
DATE: __________________W.O. _____________________
FACILITY: __________________________________________
HELICOPTER S/N: ___________________________________
REGISTRY NO.: _____________________________________
TOTAL TIME:_______________________________________
SIGNATURE:_______________
_________________________
AFTER LIGHTNING STRIKE
Because lightning behavior is difficult to predict, do a full
inspection of the helicopter. Lightning damage can show as
burn marks, heat discoloration, arc marks, or as small weld
marks (where the metal has melted and become solid again).
Honeycomb and other composite materials may show signs of
delamination.
NOTE
In all instances below, if you find damage in any
area, extend the inspection in those areas until you
find no more damage. If any component shows signs
of arc burns, discard it.
Use a magnetometer with a range no larger than
±5
gauss. Put the arrow or the red dot (depending on
the magnetometer model) within 0.5 in (12.7 mm) of
the component you are checking. Point the arrow at
the component. If parts of any component have a
reading that is greater than 1 gauss, degauss these
components.
GENERAL
1.
When you suspect that the helicopter has received a
lightning strike, examine these components for condition. Pay
particular attention to the areas around the mounting bolts.
Page 82H
Rev. 28 29 JUL 2010