05-51-29
 ALL  ú ú 02 Page 205 ú Jun 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 HOT AIR DUCT RUPTURE CONDITION - MAINTENANCE PRACTICES
______________________________________________________ (CONDITIONAL INSPECTION)
________________________
 1.  General_______
 A.  One task is supplied in this procedure. The task is hot air duct rupture conditional inspection.
 B.  This task examines the airplane structure for possible heat damage caused by a ruptured duct.
 TASK 05-51-30-202-001
 2.  Hot Air Duct Rupture Conditional Inspection___________________________________________
 A.  References
 (1)  51-00-00, Part 6, Nondestructive Test Manual
 B.  Procedure
 S 282-002
 (1)  Examine any airplane structure which has gone through a high heat condition caused by a ruptured pneumatic duct. Make sure the structure has not been damaged (Ref 51-00-00, Part 6, Nondestructive Test Manual).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 05-51-30
 ALL  ú ú 01 Page 201 ú Jun 10/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 STRUT OVERHEAT CONDITION - MAINTENANCE PRACTICES
________________________________________________ (CONDITIONAL INSPECTION)
________________________
 1.  General_______
 A.  One task is supplied in this subject. The task is strut overheat conditional inspection.
 B.  Structure in the area of the strut overheat sensor should be examined for overheat damage whenever a strut overheat condition is reported by EICAS.
 TASK 05-51-32-202-001
 2.  Strut Overheat Conditional Inspection_____________________________________
 A.  References
 (1)  NDT Part 6, 51-00-00.
 B.  Procedure
 S 212-002
 (1)  
Examine the structure in the overheat area for primer discoloration or other signs of heat damage.

 S 252-003

 (2)  
If primer discoloration or other signs of heat damage are seen, do the eddy current test per NDT Manual to determine the extent of the structural damage (NDT Part 6, 51-00-00).

 NOTE: In areas where conductivity exceeds the limits shown in
____ the NDT manual, do a hardness test to determine the extent of the structural damage.
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 05-51-32
 ALL  ú ú 01 Page 201 ú Oct 10/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 TIRE TREAD LOSS OR TIRE BURST CONDITION - MAINTENANCE PRACTICES
_______________________________________________________________ (CONDITIONAL INSPECTION)
________________________
 1.  General
_______
 A.  One task is supplied in this procedure. The task is tire tread loss conditional inspection.
 B.  When a landing gear tire loses a tread or a tire bursts, a careful examination of some areas is required. These examinations look for damage and/or blockage caused by pieces of the tire.
 C.  Damaged caused by the tire pieces can be seen as rubber and/or bitumen marks on the surface of the structure.
 TASK 05-51-34-202-001
 2.  Tire Tread Loss Conditional Inspection
______________________________________
 A.  References
 (1)  32-45-04/601, Tires
 B.  Procedure
 S 212-002
 (1)  Examine these areas for damage, delamination or local seperation, and soft spots due to core crush:
 NOTE: To find delamination or local seperation areas tap the
____ surface with a coin. To find areas of core crush, push on the surface.
 (a)  
Wing Upper Inboard Fixed Trailing Edge Panel

 (b)  
Trailing Edge Flaps

 (c)  
Flap Canoe Fairings

 (d)  
Automatic Direction Finder Sense Antenna

 (e)  
Lower Fuselage Wing-to-Body Fairing Panels
　
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