(14)
 AMM 34-51-00/501, VOR System

 (15)
 AMM 34-53-00/501, ATC System

 (16)
 AMM 34-55-00/501, DME System

 (17)
 AMM 34-57-00/501, Automatic Direction Finder (ADF)

 (18)
 AMM 53-52-01/201, Nose Radome

 (19)
 SRM 51-70-14, Allowable Damage and Repair of Flame-Sprayed Aluminum Coatings

 (20)
 D6-7170 Nondestructive Instrumental Tests for Structure

 B.  Examine the Airplane External Surface
 S 212-109
 (1)  Examine the Zone 1 (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 lightning strike.
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747-400 MAINTENANCE MANUAL 
SEE  B  SEE A ASEE  SEE  B 
SEE  A 
SEE  B 

LEGEND
ZONE 1, HIGHLY POSSIBLE
ZONE 2, POSSIBLE
ZONE 3, LESS POSSIBLE

External Lightning Strike Areas Figure 201 (Sheet 1)
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MAINTENANCE MANUAL

STABILIZER TIP AND FIN CAP INSTALLATION
(EXAMPLE)

External Lightning Strike Areas
Figure 201 (Sheet 2)

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747-400 MAINTENANCE MANUAL
 2)  Make sure to look in the areas where one surface stops and another surface starts.
 3)  Examine the internal and external surfaces of the nose radome for burns, punctures, and pin holes in the composite honeycomb sandwich structure.
 4)  Examine the metallic structure for holes, pits, burned or discolored skin and rivets.
 5)  Examine the external surfaces of the composite components for discolored paint, burned, punctured, or delaminated skin plies in the honeycomb sandwich structure.
 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 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 D6-7170.
 S 212-076
 (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.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400 MAINTENANCE MANUAL
　
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