# STC ST9421SC-D

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: American Airlines Inc, United States
- Description: Installation of a Dexter Wilson New Generation Lighted Checklist, part number 028808-001 or 028808-002.
- Applied: September 18, 1998
- Status date: October 23, 1998
- Product: Aircraft, Large Airplane
- Certification basis: Part 21
- Data sheets: [TCDS A6WE](https://openairdocs.org/tcds/A6WE)
- Certificate PDF: https://openairdocs.org/files/sha256/cb/0b/cb0be2543fc3bb0b74c392bb772cc1c6f9ae7dd73a52009c4f0fab5d0cf7d67d
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/651E281417C0A1E185256CC3000374DB.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/ST9421SC-D

## ADs that name it (0)

None.

## Approved models (2)

- The Boeing Company DC-9-82 (MD-82) ([TCDS A6WE](https://openairdocs.org/tcds/A6WE))
- The Boeing Company DC-9-83 (MD-83) ([TCDS A6WE](https://openairdocs.org/tcds/A6WE))

## 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 ST 9421 SC-D This certificate issued to: P. O. Box 582809 American Airlines, Inc.

MD 176 Tulsa, Oklahoma 74158-2809 Part 25 of theF ederal Aviation Regulations.

Original Product -Typebertificate Number: AGWE Make:

McDonnell Douglas Model:

DC-9-82/-83 Description of Type Design Change:

Installation of a Dexter Wilson New Generation Lighted Checklist, part number 028808-001 or 028808-002, in accordance with American Airlines Engineering Change Order (ECO) K2205XX dated 9/30/98 and approved 10/2/98 and one Prototype Revision form 7721-6 dated 10/22/98, or later DASISW approved revision.

This approval should not be incorporated in any aircraft of this specific model until compatibility of this modification with previously approved modifications has been determined by the installer.

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

f Grewe (Signature ) TOMINISTRA DASISW Coordinator (Title)

47.

TRANSFER ENDORSEMENT Transfer the ownership of Supplemental Type Certificate Number_ to (Name of transferee) (Address of transferee) (Number and street) (City, State, and ZIP code) from (Name of grantor) (Print or type) (Address of grantor) (Number & street) (City, State, and ZIP code) Extent of Authority (if licensing agreement):

Signature of grantor (In ink):

## Every issue (1)

- October 23, 1998: Issued, Current. [certificate](https://openairdocs.org/files/sha256/cb/0b/cb0be2543fc3bb0b74c392bb772cc1c6f9ae7dd73a52009c4f0fab5d0cf7d67d)

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