SH3311SO
Manufacture of Replacement Windows in accordance with Aeronautical Accessories, Inc. Drawing List Report No. AA-92083, Rev. M, dated September 20, 2010, or later FAA approved revisions, and installation per Installation Instructions as listed in that report. Held by Bell Helicopter Textron INC., which holds 366 approved modifications in all. Last revised February 1, 2011. System: other and general.
What it applies to
What an approved modification is
A supplemental type certificate is the FAA's approval of a change to a certified design: a new engine or propeller, avionics, an autopilot, floats, a parachute, a larger fuel tank, an ice-protection kit. The company holding it may sell the kit and the paperwork to owners of the listed models; the modification then becomes part of that aircraft's record. The FAA's list says what was approved and for which models, not how many aircraft carry it.
Source: FAA supplemental type certificates (Dynamic Regulatory System). Register counts from the FAA register of October 20, 2026.