Windows Inspection And Repair; Heated Glass Windshield (Pilot’s Side) Inspection - Piper Malibu Meridian PA-46-500TP Airplane Maintenance Manual

Peel Chip
Haze
Blemish
Mark-Off
Delamination
3. Inspection and Repair
CAUTION: DAMAGE LIMITS AND REPAIRS STATED HEREIN MUST BE APPLIED
CONSERVATIVELY. REWORK OF MULTIPLE CHIPS OR SCRATCHES SHOULD NOT BE
ATTEMPTED IN ANY CASE WHERE, WHEN FINISHED, A LINEAR PATTERN WILL HAVE
BEEN CREATED.
A. Heated Glass Windshield (Pilot's Side) Inspection
CAUTION: PRESSURIZED FLIGHT PROHIBITED WITH CRACKED OR CRAZED WINDSHIELD.
The pilot's windshield is a two-ply laminated glass containing a heating element.
(1) Critical Area Inspection. The area of the laminated glass windshield used for taxiing, takeoff,
climb, cruise, and landing.
(a) Cracks can occur in either the inner, outer, or both glass plies. Cracking in either ply is
critical and cause for immediate replacement.
(b) Blemishes.
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(c) 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.
(d) Scratches.
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Apr 15/07
PIPER AIRCRAFT, INC.
PA-46-500TP, MALIBU MERIDIAN
MAINTENANCE MANUAL
Peel chips, also known as adhesion chips or cold chips, occur on the laminated
surface of a glass ply when the vinyl interlayer pulls a chip of glass out of the
glass ply.
A foggy appearance located on the surface of the transparent material.
Speck, air bubble, or other minor imperfection imbedded in the transparent
material.
An almost nonexistent shallow depression on the surface possessing
practically no depth. Discernible only due to a noticeable rim or roughened
surface caused by mold surface defects transferred to the surface during the
forming operation.
Visible evidence of a physical break of the bond between the plastic interlayer
and either glass ply. Delamination may be caused by laminating stresses,
preload on installation, or excessive heat. Cloudy or milky appearance in the
delamination indicates moisture or solvent penetration.
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.
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