# STC SA274NW

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: WAC Corporation Inc, United States
- Description: Replacement of the left forward side window (pilots' compartment) with a plexiglas dome (0.250 in. thickness)
- Applied: January 23, 1976
- Status date: April 5, 1976
- Product: Aircraft, Small Airplane
- Certification basis: Part 21
- Data sheets: [TCDS 2A4](https://openairdocs.org/tcds/2A4)
- Certificate PDF: https://openairdocs.org/files/sha256/68/b4/68b40547f93922ee07dcdb3ef7ec85f9c57166349ca0fb738692f200d6f76205
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/998E7F099BCF252586257ADA006E7E75.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA274NW

## ADs that name it (0)

None.

## Approved models (1)

- Twin Commander Aircraft LLC 680 ([TCDS 2A4](https://openairdocs.org/tcds/2A4))

## 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: SA271201 This certificate issued to: WAC Corporation, INC.

Put 3 the Civil Air Jugululions, effective November 1, 1949.

Original Product -TypebertificateNumber: 2Dx Make: Rockwell Commander Aterkel: 680 LacrumfypeDwin bune: Replacement of the left forward side window (pilots' compartmont) with a plexiglas dome (0.250 in, thickness) in accordance with Photos

(1) through (4).

Invalian/Onditions: Data pertaining to this modification are considerod inadeduate for duplication in other aircraft.

Rockwell Commander Model 680, Serial. Number 6805h4-213 only. A cop7 of this Certi- Ficate, and WAC Corporation, Ino. FAA Approved Flight Manual Supplement shall be maintained as part of the permanent records for the modified aircraft.

les certifieat and the supporting dute which is the lasis fis offroral shall remain ineffeel until sur evatred, sespended, rented, or a termination date is thoris ealished by the Salministroter of thu aleral Meation Administration.

Date maud:

.. /слане: Арі] 5, 1976 Date Amended:

¡DERAI AVIATION ten g/ the Elmints

NORIN STRATO Chief.. helmenrane and Matsfactorin Ans alicate of this cationte is parshable be a fine of tel everdos 220 es rapiseral at credes 2 31

## Every issue (1)

- April 5, 1976: Issued, Current. [certificate](https://openairdocs.org/files/sha256/68/b4/68b40547f93922ee07dcdb3ef7ec85f9c57166349ca0fb738692f200d6f76205)

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