Piper PA-28-161, Maintenance Manual

Page: 691 / 1104

PAGE 3
Nov 30/06 4C13
51-10-00
C. Inspection
CAUTION: INSPECTION FOR CORROSION MUST BE PERFORMED BY PERSONS FAMILIAR
WITH CORROSIVE PROBLEMS AND REMEDIES.
NOTE: Some areas of the airplane have been treated with a corrosion inhibiting compound which
requires re-treatment at five (5) year intervals. See Each Five (5) Years, Per Calendar Year,
5-30-00.
Check for corrosion at every inspection. In trouble areas, inspection frequency must be increased.
In addition to routine inspections:
(1) Aircraft operating around a marine environment must be given special inspections on a weekly
basis. See Per Specific Operation / Operating Environment, 5-30-00.
(2) Aircraft operating in semi-acid conditions must be inspected monthly. Semi-acid conditions are
likely to occur in industrialized areas where sulphur-bearing particles in dust, smoke, and smog
will attack painted surfaces. See Per Specific Operation / Operating Environment, 5-30-00.
(3) Inspection for corrosion must be performed by personnel familiar with corrosive problems and
remedies.
(a) Daily and preflight inspection must include engine frontal areas, all intake vents, engine
compartments, gaps, seams, and faying surfaces in exterior skins, wheel and wheel well
areas, battery compartment, fuel cell, all other drains, and any bilge areas not requiring
extensive removal of inspection access covers.
(b) Detailed inspection must include above referenced areas along with areas requiring
removal of inspection plates and panels to thoroughly inspect internal cavities of aircraft.
(4) Paint tends to hide corrosion in its initial stages. The results of corrosion can sometimes be
seen as blisters, flakes, chips, and other irregularities in paint.
D. Corrosion Removal and Control
CAUTION: THE DEPTH OF MATERIAL REMOVED MUST NOT EXCEED SAFE LIMITS.
CAUTION: REMOVAL OF SEVERE CORROSION MAY BE CONSIDERED A MAJOR REPAIR.
ANY REPAIR OF THIS TYPE MUST BE APPROVED BY THE FAA BEFORE THE
AIRPLANE CAN BE RETURNED TO SERVICE.
Corrosion cannot be prevented or eliminated on aircraft; it can only be reduced to an acceptable
level by proper control methods.
All corrosion products must be removed prior to refinishing. If not removed, corrosion will begin
again, even though affected area is refinished.
(1) Before beginning any rework:
(a) Position airplane in a wash rack or provide some type of washing apparatus for rapid
rinsing of all surfaces.
(b) Connect static ground line to airplane.
(c) Remove airplane battery if required.
(d) Protect pitot-static ports, engine openings, airscoops, louvers, wheels, tires, and other
portions of airplane from moisture and chemical brightening agents.
(e) Protect surfaces next to rework areas from chemical paint strippers, corrosion removal
agents, and surface treatment materials.
PIPER AIRCRAFT, INC.
PA-28-161, WARRIOR III
MAINTENANCE MANUAL