Chips, Scratches, And Crazing Limitations - Piper Malibu Meridian PA-46-500TP Airplane Maintenance Manual

(d) Press oiled face of prism to glass or acrylic. Slide prism around until a constant film of oil
extends across prism face and window surface.
(e) Look into 90° face of prism (see Figure 2). The image of an unfractured fastener hole will
appear as a frosty cylinder.
(f) If hole is countersunk, cylinder will appear to have a cone setting on one end as seen in
Figure 2.
(g) The image of a cracked hole will appear as a frosty or reflective projection extending from
the hole (see detail A-A, Figure 3).
(h) The image of a crack from one hole to another will appear as a frosty or reflective
irregular surface (see detail B-B, Figure 3).
(4) Crack Limitation.
(a) The maximum acceptable length of a crack from any single screw hole is 0.300 inch
(7.62mm).
(b) The maximum combined length of multiple cracks into the space between two adjacent
bolt holes is 0.300 inch (7.62mm) (see Figure 3).
(c) If a crack less than 0.300 inch (7.62mm) is left unrepaired, reinspect the window each
additional 25 hours of aircraft operation.
(d) A maximum of three bolt holes with cracks less that 0.299 inch (7.59mm) long are
acceptable in any one window pane before that window pane must be replaced.
(e) Replace window pane if a single crack or combination of adjacent facing cracks exceed
0.300 inch (7.62mm) in length.

(5) Chips, Scratches, and Crazing Limitations.

CAUTION: DAMAGE LIMITS AND REPAIRS STATED HEREIN MUST BE APPLIED
(a) Scratches in acrylic windows and the co-pilot's windshield may be reworked (see Window
/ Windshield Repair / Rework Procedure, below) as follows:
1
2
3
4
(b) Replace acrylic windows with scratches that cannot be reworked in accordance with these
standards.
6J3
PIPER AIRCRAFT, INC.
PA-46-500TP, MALIBU MERIDIAN
MAINTENANCE MANUAL
CONSERVATIVELY. REWORK OF MULTIPLE CHIPS OR SCRATCHES SHOULD
NOT BE ATTEMPTED IN ANY CASE WHERE, WHEN FINISHED, A LINEAR
PATTERN WILL HAVE BEEN CREATED.
Co-pilot's windshield - scratch is less than 0.030 inch (0.762 mm) deep and
windshield is a minimum of 0.279 inch (7.087 mm) thick after rework.
Cockpit side windows - scratch is less than 0.027 inch (0.686 mm) deep and window
is a minimum of 0.248 inch (6.3 mm) thick after rework.
Cabin side windows - scratch is less than 0.022 inch (0.589 mm) deep and window is
a minimum of 0.203 inch (5.156 mm) thick after rework.
No vision distortions in critical and semi-critical areas as a result of rework.
56-00-00
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Apr 15/07