# STC SA1423SO

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: American Airlines Inc, United States
- Description: Relocation of standby horizon indicator from the center instrument panel to the right center of pilot's instrument panel.
- Applied: March 16, 1983
- Status date: December 30, 2015
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A16WE](https://openairdocs.org/tcds/A16WE)
- Certificate PDF: https://openairdocs.org/files/sha256/6f/68/6f68dc4eac9cb82b006da1f725c13ce9333c37e6cca8e227051a45bfa216dc89
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/4B92E2D6CF5BC4BB86257F6900781D4E.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA1423SO

## ADs that name it (0)

None.

## Approved models (1)

- The Boeing Company 737-200 Series ([TCDS A16WE](https://openairdocs.org/tcds/A16WE))

## What the certificate says

Read from the PDF's text layer, without the form's printed wording; the layout is lost and the order can differ. The PDF is the record.

FAA Form 8110-2 (5/14) Page 1 of

Part of the

Signature

Title SA1423SO American Airlines, Inc.

3900 N. Mingo Road Engineering Dept., MD 208 Tulsa, Oklahoma 74116 Federal Aviation Regulations.

1. Relocation of the Standby Horizon Indicator from the center instrument panel to the right center of the pilot's instrument panel in accordance with Piedmont Airlines EA No. 737-747, Issue B, dated December 13, 1982.

1. The installer must determine whether this design change is compatible with previously approved modifications.

2. If the holder agrees to permit another person to use this certificate to alter a product, the holder must give the other person written evidence of that permission.

Gaetano Sciortino Manager New York Aircraft Certification Office The Boeing Company 737-200 June 01, 1989, December 4, 2015, December 30, 2015 March 16, 1983 March 24, 1983 A16WE 2 “Reissued on December 4, 2015, to supersede the original STC, which has been lost or misplaced.”

FAA Form 8110-2 (5/14) Page 2 of

To (Name and address of transferee)

From (Name and address of grantor)

2 SA1423SO

## Every issue (2)

- December 30, 2015: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/6f/68/6f68dc4eac9cb82b006da1f725c13ce9333c37e6cca8e227051a45bfa216dc89)
- December 4, 2015: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/0e/84/0e844afb28b3beeadebbffd500b02ddb4567d7b4c1823f08abd73dcb5e78b5b9)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.