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747-400 MAINTENANCE MANUAL
 S 212-075
 (2)  Examine the control stand components as follows for signs of volcanic ash contamination (if cabin contamination is found):
 (a)  
The thrust lever brakes

 (b)  
The flap lever brakes

 (c)  
The flap lever RVDT's

 (d)  
The autothrottle gearbox

 (e)  
The thrust lever position resolvers.

 S 212-091
 (3) If you find ash on the air conditioning ducts on the flight deck, remove and examine the flight deck modules (Ref Chapter 31).
 T. Put the Airplane Back To Its Initial Condition
 S 862-090
 (1)  Put the airplane back to its initial condition after all necessary volcanic ash conditional inspections are completed.
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747-400 MAINTENANCE MANUAL
 DRAGGED TAIL CONDITION - MAINTENANCE PRACTICES
______________________________________________ (CONDITIONAL INSPECTION)
________________________
 1.  General_______
 A.  One task is supplied in this procedure. The task is examine for dragged tail damage.
 B.  This task examines the lower and exterior fuselage skins for damage caused by a dragged tail condition.
 TASK 05-51-36-202-001
 2.  Examine for Dragged Tail Damage_______________________________
 A.  References
 (1)  SRM 51-60-00, Structural Repair Manual
 B.  Procedure
 S 212-005
 (1)  Examine the airplane areas that follow:
 (a)  
Visually examine the exterior lower fuselage skin from B Sta 1700 to the APU compartment. 1) Look for signs of

 -scrapes
 -burns
 -cracks
 -holes
 -buckled belly skins and/or drain masts
 -
fasteners that are loose

 -
fasteners that are not there.

 (b)  
If external damage is seen, examine the fuselage internally in the area of the damage. 1) Look for signs of bent or cracked

 -stringers
 -lower chord flanges
 -frames
 -pressure bulkheads
 -clips.
 2) Also, look for

 -buckled or wrinkled webs
 -fasterners that are loose
 -fasteners that are not there.
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 (c)  Visually examine
 -
STA 2360 bulkhead

 -
STA 2484 bulkhead

 -
STA 2598 bulkhead (this includes the stabilizer support structure and diagonal braces)

 -APU support structure
 -Crown skin and stringers, from BS 1700 aft to the dorsal fin
 (do a visual inspection for signs of bucklings). 1) Look for signs of
 -buckling
 -crippling
 -distorted structural elements
 -missing fasteners
 -distorted fasteners.
 S 352-004
 (2)  If any damage is found, repair the damaged area (SRM 51-60-00, Structural Repair Manual), or other approved procedures.
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747-400 MAINTENANCE MANUAL
 LANDING GEAR DEPARTS HARD SURFACE CONDITION - MAINTENANCE PRACTICES
___________________________________________________________________ (CONDITIONAL INSPECTION)
　
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