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D.
Acrylic Window (Cabin) Inspection
CAUTION: PRESSURIZED FLIGHT PROHIBITED WITH CRACKED OR CRAZED WINDOW.
(1) The cabin windows are two-ply laminated stretched acrylic 0.225 inch thick.
(2) Non-Critical Area Inspection. Any portion of a window not used for flight vision.
(a) Cracks.
Inspect for cracks as directed below: Crack Inspection - Acrylic Windows.
(b) Crazing.
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2
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4
(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) Mark-Off in moderate amounts is acceptable provided that visibility is not impaired.
(e) Distortion.
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2
3
E.
Crack Inspection - Acrylic Windows and Windshields.
CAUTION: PRESSURIZED FLIGHT PROHIBITED WITH CRACKED OR CRAZED
WINDOW/WINDSHIELD.
(1) Perform this inspection annually or each 1,000 hours, whichever occurs first.
NOTE: This inspection should also be performed after repainting when any chemical stripping
agent was used. Use the prism method described in step (3) to inspect the entire
circumference of the window for stripper damage/etching; especially in areas
concealed by window frames, retainers, plates, or collars.
(2) Inspect window panes as follows:
(a) Inspect sealant for signs of wear, deterioration, and positive contact with mounting
surfaces.
(b) Inspect window frames, retainers, plates, and collars for cracks, loose rivets or screws,
corrosion, and structural defects.
(3) Inspect bolt holes in windows and co-pilot's windshield as follows, using Window Inspection Kit
- P/N 766-294. (A 45° acrylic prism and glycerin may be used if kit not available.)
(a) Clean area to be inspected with soap and water to ensure surface is free of oil, dirt, and
wax.
(b) Determine which immersion oil to use: Type A in cold weather; Type B in hot weather.
(c) Apply a small amount of oil to the surface of window adjacent to bolt hole. On initial
application, use a small amount of oil applied directly to one 90° face of inspection prism
in contact with glass or acrylic (see Figure 2).
56-00-00
PAGE 8
Apr 15/07
PIPER AIRCRAFT, INC.
PA-46-500TP, MALIBU MERIDIAN
MAINTENANCE MANUAL
Crazing in the windows is critical.
Determine depth of craze using a calibrated depth gauge or scale (see Figure 1).
A craze of 0.045 inch (1.143 mm) depth is cause for immediate replacement. A craze
0.022 inch (0.559 mm) deep is cause for replacement at the earliest opportunity.
Crazing in any portion of a window requires replacement.
Distortion along the sides of the window within 0.5 inches (12.70 mm) or less of the
retainer is acceptable.
Distortion along the upper portion of the window is acceptable if distortion does not
extend downward more than 2.00 inches (50.8 mm) from the top and does not impair
vision.
Distortion of the main body of the side window is acceptable providing the distorted
area does not exceed 25 percent of the winddow area.
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