1. Above-Maximum Gear Down Placard Speed Conditional Inspection
A. Examine all nose and main gear doors including hinges, linkage and linkage support structure, and fairing panels for distortion, cracks, misalignment, displacement, fastener hole elongation or tear-out, pulled or missing fasteners, and any other evidence of distress.
B. Examine system installations in wheel wells for any evidence of distress.
500
Jun 20/85 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 5-51-231 Page 201
TIRE TREAD LOSS OR TIRE BURST - (CONDITIONAL INSPECTION)
1.
General
Following any incident involving the loss of tread from, or the bursting of, a nose or main gear tire, the areas detailed below should be inspected for impact damage and/or obstruction from tire fragments becoming lodged in the structure and components. Impact damage is usually evidenced by rubber and bitumen markings deposited on the impacted surface.
2.
Tire Tread Loss - Conditional Inspection
A. Examine lower surface of wing upper and lower inboard fixed trailing edge panels for damage, areas of delamination on local separation (detected by coin tapping method) and soft spots from core crushing (detected by pushing on surface).
B. Examine inboard trailing edge flaps and fairings for damage, areas of delamination or local separation and soft spots from core crushing. Examine for tire fragments lodged in linkages or in flap carriages (main and foreflap sequence carriages).
C. Examine trailing edge flap jackscrews, actuating linkages and rods for damage and obstruction from tire fragments. Examine flap jackscrew seal plate for delamination or local separation.
D. Examine antenna and lower fuselage wing-to-body fairing panels for damage, areas for delamination or local separation and soft spots from core crushing.
E. Examine wheel well areas for damage and obstruction from tire fragments. Pay particular attention to hydraulic plumbing and flap drive torque tubes for distortion due to impact damage from tire pieces.
F. Examine landing gear assemblies, associated components and hydraulic plumbing for evidence of impact or flailing damage and hydraulic fluid leakage.
G. Examine wheel well doors and actuating rods for damage and obstruction from tire fragments.
H. Examine remaining tires on the affected gear for evidence of slashing and wire penetration of the tread and sidewalls.
500
Sep 20/82 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 5-51-251 Page 201
VOLCANIC ASH CONDITION - MAINTENANCE PRACTICES (CONDITIONAL INSPECTION)
1. General
A. Flight crew reports of electrostatic discharge across the windshields and a bright glow in the engine inlets along with subsequent engine shutdown in some cases and obscured visibility through the windshields and windows are indications of volcanic ash encounter.
B. Volcanic ash is highly abrasive material generally considered to be non-corrosive over the short term. However, the abrasive nature of the ash can affect finishes resulting in a corrosive situation. Removal of volcanic ash and repair of finishes should be accomplished at the earliest opportunity.
C. The texture of volcanic ash resembles talcum powder. The majority of the particles are under 5 microns with trace amounts over 50 microns. Because of the abrasive nature of volcanic ash, care should be taken not to rub the surface when washing the airplane (Ref 12-40-0).
D. The ash will cling to exposed lubricated surfaces and may penetrate many conventional seals, enter the engine gas path and air conditioning system, and may enter other orifices on the airplane. It is assumed that volcanic ash will not enter sealed bearings such as wheel bearings. Monitoring of rotating or sliding parts for evidence of ash related damage not found initially should be considered as a follow-on program depending on the severity of the ash fallout.
E. The conditional inspection should be accomplished if one or more of the following occur:
(1)
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