Piper Malibu Meridian PA-46-500TP Airplane Maintenance Manual page 1271

(e) Delamination.
Delamination is primarily a vision issue. Cloudy or milky appearance in the critical area
(i.e. - obstructing vision required for safe operation of the aircraft) is cause for immediate
replacement.
(f) Peel Chips
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(g) Mark-Off of such low intensity that vision quality is not impaired and that is not visible
when looking through the windshield is acceptable.
(h) Distortion. Slight horizontal distortion is acceptable, if: there are no more than two lines;
they do not occupy more than 25 percent of the windshield area, and; they are separated
by a minimum of six inches (15.24 cm).
(2) Semi-Critical Area Inspection. The perimeter area of the heated glass windshield used for
general flight vision.
(a) Blemishes.
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(b) Haze or foggy appearance on the glass is not acceptable if the amount of haze/fog
causes an obstruction of vision in the area used for operation of the aircraft.
(c) Scratches.
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(d) Delamination.
Delamination is primarily a vision issue.
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PIPER AIRCRAFT, INC.
PA-46-500TP, MALIBU MERIDIAN
MAINTENANCE MANUAL
Delaminated areas characterized by irregular or jagged boundaries indicate uneven
separation of the vinyl and glass. This condition may cause the vinyl to pull chips
from the inner glass ply, resulting in failure of the glass ply. Conduct periodic
inspections to determine if the damage is progressive or if chipping of the inner glass
ply is present.
Replace windshield if any of the following conditions are noted:
a Evidence of chipping of inner glass ply.
b Area of vision required for safe operation is affected.
c Windshield heat system inoperative.
Blemishes in windshields form in the vinyl plastic interlayer bonding the two glass
plies together.
Blemishes in the critical or semi-critical portion of the windshield are not acceptable
unless 0.062 inch (1.575 mm) or smaller in circumference, including distorted area.
No more than two blemishes, at least 12 inches (30.48 cm) apart are acceptable in
the windshield.
No more than two blemishes within a two inch (5.08 cm) area along the upper
portion of the windshield are acceptable.
Scratches in the outboard surface of the outer glass ply no longer than 0.062 inch
(1.575 mm) and no deeper than 0.020 inch (0.508 mm) are allowable.
Scratches in the inboard surface of the inner glass ply with a depth less than or equal
to 0.002 inch (0.05 mm) are allowable.
Scratches which obstruct vision required for safe operation of the aircraft or exceed
the above limits are cause for immediate windshield replacement.
Delamination is allowable up to two inches along the perimeter of the daylight
opening of the windshield. In the corners, up to four inches is allowable.
Windshields exhibiting delamination must be monitored as the condition is usually
progressive.
56-00-00
Apr 15/07
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