MAINTENANCE MANUAL
Page 05-40
Effectivity: All
Issue 2 | Rev. 0
5. LIGHTNING STRIKE
If flown through a region of the atmosphere where electrical discharge is occurring, the airplane may
become part of the discharge path. During a lightning strike, the current enters the airplane at one
point and exits another, usually at opposite extremities. It is in these entrance and exit points where
damage is most likely to occur. Burning and/or eroding of small surface areas of the skin and structure
may be detected during inspection. In most cases, the damage is obvious. In some cases, however,
hidden damage may result.
Expected mechanical damage of a lightning strike:
• On metallic skin, eroded metal and local buckles in attachment points may appear.
• On composite skin, burned holes in the metal foil and local delimitation in attachment points may
appear.
• On propellers local burns, especially in the tips of the propeller blades, may appear.
• On antennas burns and delamination may appear.
• Static dischargers (if installed) may be damaged or missing completely.
• Improper function to electrical/electronic units may appear.
Inspect the airplane in following range when it is suspected or known that the airplane has been struck
by lightning:
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