05-51-19
ALL ú ú 01 Page 204 ú Jan 28/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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757
MAINTENANCE MANUAL
6) You need to use instrumental NDI methods or tap tests to find composite structure damage you cannot see.
NOTE: Damage you cannot 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 that is different than the sound of a solid bonded area. Refer to the Nondestructive Test Manual D634N301.
S 212-044
(2) Examine the Zone 2 (Figure 201) surface areas for signs of lightning strike damage.
(a) Do the examinations that follow: 1) Examine the external surfaces carefully to find 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, pits, burned or discolored skin and rivets.
4) Examine external surfaces of composite components for discolored paint, burned, punctured, or delaminated skin plies in the honeycomb sandwich structure.
5) You need to use instrumental NDI methods or tap tests to find composite structure damage you cannot see.
NOTE: Damage you cannot see, such as delamination,
____ can extend to the 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 that is different than the sound of a solid bonded area. Refer to the Nondestructive Test Manual D634N301.
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05-51-19
ALL ú ú 01 Page 205 ú Sep 28/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
S 212-051
(3) If the entrance and exit points are not found during the examination of Zones 1 and 2 areas, examine Zone 3 (Fig. 201) surface areas for signs of lightning strike damage.
(a) Do the examinations that follow: 1) Examine the external surfaces carefully to find the entrance and exit points of the lightning strike. 2) Make sure you look in the areas where one surface ends and another surface starts. 3) Examine the metallic structure for holes, pits, burned or discolored skin and rivets.
4) Examine external surfaces of composite components for discolored paint, burned, punctured, or delaminated skin plies.
5) You need to use instrumental NDI methods or tap tests to find composite structure you cannot see.
NOTE: Damage you cannot 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 that is different than the sound of a solid bonded area. Refer to Nondestructive Test Manual D634N301.
S 212-052
(4) If you find lightning strike damage to aluminum coated composite panels, refer to SRM 51-70-14 for allowable damage, time limited repairs and permanent repair procedures.
S 332-006
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 AND FREEZE AT ALTITUDE.
(5)
Repair or seal the damaged areas. See SRM 51-70-14.
S 712-008
(6)
Make sure the navigation lamps, rotary lights, and landing lights operate.
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