STC MOD FACT SHEET
BeechcraftStandard and Extra-Thick One- Piece Windshield Conversion |
| Models: | Early Model Beechcraft Bonanza, Baron, Debonair, and Travelair Aircraft. |
| Purpose: | Converts Two-Piece Windshield to One-Piece for improved visibility and also Increases Windshield Thickness for a quieter cabin and greater impact resistance. |
Models / Part Numbers:
Bonanza / Baron / Debonair / Travelair –
| 33 | (S/N CD-1 Through CD-1006) | 271.312 |
| 35 | (S/N D-1 Through D-7976) | 271.375 |
| 55 | (S/N TC-1 Through TC-954) | |
| 95 | (S/N TD-2 Through TD-637) | (Apply to All Listed Aircraft) |
The Original Design: From the factory, these early aircraft were equipped with atwo-piece windshield– a right half and a left half with a metal structure in between.The factory windshields are mounted in metal frames and factory replacement windshieldsare supplied with frames as assemblies. The windshields themselves fit in the channelof the frame, allowing them to “float” for expansion and contraction. Beechcraft currentlyoffers no one-piece windshield for the above aircraft, and all two-piece factory replacementwindshields are supplied only in 3/16″ or 1/4″ thicknesses.The LP Aero Plastics, Inc. Mod: This STC Conversion modifies the existing windshield
frames to form a one-piece frame to accommodate a new One-Piece Windshield. This allows
the one-piece windshield to retain the Beechcraft-engineered superior mounting method.
This is a very good mounting system as no holes need to be drilled through the windshield
itself for mounting (see Fig. 1). The LP Aero Plastics Extra-Thick Windshields are milled
on the inside edge to fit the frame, placing the extra thickness toward the inside of the
aircraft where it is not obtrusive. These STC LP Aero Plastics Windshields are available
in 1/4″ (.250″), 5/16″ (.312″), or 3/8″ (.375″) thicknesses. The part number suffix indicates
the thickness, i.e., 271.250 for 1/4″, 271.312 for 5/16″, and 271.375 for 3/8″.Competitive Information: Currently, the only other one-piece standard configuration
(not “Speed Slope”) conversion windshields for these aircraft are available only in 1/4″
thickness, and these discard the original windshield frames and are mounted with holes
drilled through the windshield (the proper replacement for this conversion is P/N 998).
However, for many years Beryl D’Shannon Aviation Specialties, Inc. has been manufacturing
1/4″ to 1/2″ windshields for these earlier aircraft that are known as “Speed Slope” windshields.
This conversion changes the angle or “rake” of the windshield by moving the base out farther
on the cowl, giving the windshield a more aerodynamic shape, but also mounts using holes
drilled through the windshield. Holes drilled in windshields for mounting purposes tend
to start cracks. If the aircraft has been converted to either of the above hole-mounted
one-piece windshields, the 271. xxx cannot be used because the frames have been discarded
and/or the windshield configuration has been changed. The 271. xxx is used only as a
one-piece conversion from the original two-piece installation.Options Available: Thicknesses from 1/4″ (.250″) to 3/8″ (.375″).
As with all LP Aero Plastics Windshields and Windows, Clear, Green, and Solar Gray tints
are available.
