Acrylic Window (Cockpit) Inspection - Piper Malibu Meridian PA-46-500TP Airplane Maintenance Manual

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(b) Haze or foggy appearance 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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(e) Mark-Off of such low intensity that vision quality is not impaired and that is not visible
when looking through the windshield is acceptable.
(f) Distortion.
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C.

Acrylic Window (Cockpit) Inspection

CAUTION: PRESSURIZED FLIGHT PROHIBITED WITH CRACKED OR CRAZED WINDOW.
(1) The cockpit windows are two-ply laminated stretched acrylic 0.275 inch thick.
(2) Semi-Critical Area Inspection. The areas of cockpit acrylic windows used for general flight
vision.
(a) Cracks.
Inspect for cracks as directed in paragraph 6, below: Crack Inspection - Acrylic Windows.
(b) Crazing.
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56-00-00
PAGE 6
Apr 15/07
PIPER AIRCRAFT, INC.
PA-46-500TP, MALIBU MERIDIAN
MAINTENANCE MANUAL
A craze 0.032 inch (0.813 mm) deep is cause for replacement at the earliest
opportunity.
Crazing in any portion of the windshield requires replacement.
Scratches in acrylic windshields may be reworked per Window / Windshield Repair /
Rework Procedure, below, if:
a They are less than 0.030 inch (0.762 mm) deep.
b Windshield is a minimum of 0.279 inch (7.087 mm) thick after rework.
c No vision distortions in critical and semi-critical areas as a result of rework.
Replace acrylic windshields with scratches that cannot be reworked in accordance
with these standards.
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.
Replace windshield if any of the following condition are noted:
a Delamination exceeds allowable limts.
b Area of vision required for safe operation is affected.
A moderate amount of distortion is acceptable along the lower portion of the
windshield if no more than 1.5 inches (3.81 cm) above the windshield retrainer strip.
Distortion may not be so severe that it restricts vision or diverts runway lines or
section lines more than 45°.
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).
Crazing in the windows is critical.
Determine depth of craze using a calibrated depth gauge or scale (see Figure 1).
A craze 0.055 inch (1.397 mm) deep is cause for immediate replacement. A craze
0.027 inch (0.686 mm) deep is cause for replacement at the earliest opportunity.
Crazing in any portion of a window requires replacement.
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