# STC SA1253NW

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Knowlton, Robert D., United States
- Description: Installation of a Cee Bailey (one-piece) plexiglass windshield
- Applied: May 27, 1981
- Status date: June 8, 1981
- Product: Aircraft, Small Airplane
- Certification basis: Part 21
- Data sheets: [TCDS 3A12](https://openairdocs.org/tcds/3A12)
- Certificate PDF: https://openairdocs.org/files/sha256/1d/ef/1def5d5ce79516fa54394b367cde315a4f55a457256ffcc89f917c433fa7237b
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/4C7032E0CF39755E86257A3D004B6DDC.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA1253NW

## ADs that name it (0)

None.

## Approved models (1)

- Cessna Aircraft Company 172 ([TCDS 3A12](https://openairdocs.org/tcds/3A12))

## What the certificate says

This is OCR from the scanned FAA certificate. OCR can misread letters and numbers.

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number SAI253NW This certificate issued to: Robert Knowton Purt 3 ef the CiVi1 Air Regulations, dated November 1, 1949, as amended by 3-1 through 3-12.

Original Product -Type bertificate Number: 3A12 Make: Cessna Model: 172 Dacriplin/ TypeDyn Change Installation of a Cee Bailey (one-piece) plexiglass windshield, Item No. 63R, in accordance with STC SA531NW, excluding the centerline windshield strip in accordance with Robert Knowlton photograph number 1.

Limain andbanditin Data pertaining to this modification are considered inadequat for duplication in other aircraft. This approval is limited to the installation in Cessna 172, Serial Number 36638 only. A copy of this Certificate shall be maintaine as part of the permanent records for the modified aircraft.

This certificate and the supporting data which is the basis for approval shall remain in effect motil surrendered, suspended, rocked, or a lermination date is therwise estaldished by the Stdministrater of the Federal Aviation Administration Late f uplication: May 27, 1981 I ule missed:

Date of issuena: June 8, 1981 Date Amended:

EDERAL AVIATION Navell Pederson A the Sidministrat Acting Chief, Seatlié Area Aircraft TOMINIS TRAVO Certification Office

**FAA FOR 8110-2 (10-68)**

## Every issue (1)

- June 8, 1981: Issued, Current. [certificate](https://openairdocs.org/files/sha256/1d/ef/1def5d5ce79516fa54394b367cde315a4f55a457256ffcc89f917c433fa7237b)

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