6) You need to use instrumental NDI methods or tap tests to find composite
structure damage you cannot see.
NOTE: Damage you can not see, such as delamination, can extend to the areas around the damaged area you can see. Delamination can be detected by instrumental NDI methods or by a tap test. For a tap test, use a solid metal disk and tap the area adjacent to the damaged area lightly. If there is delamination, you will hear a sound different from the sound of a solid bonded area. Refer to the Nondestructive Test Manual D637239.
(b) If you find lightning strike damage to aluminum coated composite panels, refer to SRM 51-40-9 for allowable damage, time limited repair, and permanent repair procedures.
CAUTION: MAKE SURE TO REPAIR THE LIGHTNING STRIKE DAMAGE TO THE ALUMINUM COATING ON COMPOSITE PANELS. IF YOU DO NOT REPAIR AN ELECTRICALLY CRITICAL PANEL, AS SPECIFIED BY SRM 51-40-9. A SUBSEQUENT LIGHTNING STRIKE COULD CAUSE THE MALFUNCTION OF A NECESSARY AIRPLANE SYSTEM.
CAUTION: MAKE SURE TO SEAL OR REPAIR ALL DAMAGE. FAILURE TO SEAL OR REPAIR DAMAGE CAN CAUSE MORE INTERNAL DAMAGE BECAUSE MOISTURE CAN GET IN.
(c) Repair or seal the damaged areas. See SRM 51-40-9.
(2) Examine the Zone 2 (Figure 201) surface areas for signs of a lightning strike.
(a)
Do the examinations that follow: 1) Use special care to look for the entrance and exit points of the lightning strike. 2) Make sure you look in the areas where one surface stops and the other surface
starts.
(b)
If the entrance and exit points are not found in this examination of Zone 1 and 2 areas, examine Zone 3 (Fig. 201) for signs of a lightning strike. 1) Look carefully for the entrance and exit points of the lightning strike. 2) Make sure you look in the areas where one surface stops and the other surface
starts. 3) Examine the metallic structure for holes or pits and for burned or discolored skin and rivets.
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4) Examine external surfaces of composite honeycomb material for discolored
paint, burned, punctured, or delaminated skin plies.
5) You need to use instrumental NDI methods or tap tests to find composite structure damage you cannot see.
NOTE: Damage you can not see, such as delamination, can extend to the areas around the damaged area you can see. Delamination can be detected by instrumental NDI methods or by a tap test. For a tap test, use a solid metal disk and tap the area adjacent to the damaged area lightly. If there is delamination, you will hear a sound different from the sound of a solid bonded area. Refer to the Nondestructive Test Manual D637239.
CAUTION: MAKE SURE TO SEAL OR REPAIR ALL DAMAGE. FAILURE TO SEAL OR REPAIR DAMAGE CAN CAUSE MORE INTERNAL DAMAGE BECAUSE MOISTURE CAN GET IN.
(c) Repair or seal the damaged areas. See SRM 51-40-9
(3)
Make sure the navigation lamps, rotary lights, and landing lights operate and do not have a broken lens.
(4)
Do the examinations of the flight controls that follow:
(a)
If the rudder shows signs of a lightning strike, examine the surface hinges, bearings, and bonding jumpers for signs of damage.
(b)
If the elevators show signs of a lightning strike, examine the surface hinges, bearings, and bonding jumpers for signs of damage.
(c)
If the ailerons show signs of a lightning strike, examine the surface hinges, bearings, and bonding jumpers for signs of damage.
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(d)
If the speed brakes show signs of a lightning strike, examine the surface hinges,
bearings, and bonding jumpers for signs of damage.
(e)
If the nose wheel doors show signs of a lightning strike, examine the surface hinges, bearings, link mechanism, door structure, and bonding jumpers for signs of damage.
(f)
If the main landing gear doors show signs of a lightning strike, examine the surface hinges, bearings, and bonding jumpers for signs of damage.
(g)
If the trailing edge flaps show signs of a lightning strike, examine the surface hinges, bearings, and bonding jumpers for signs of damage.
(h)
If the leading edge flaps/slats show signs of a lightning strike, examine the surface hinges, bearings, and bonding jumpers for signs of damage.
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