# STC ST9429SC-D

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: American Airlines Inc, United States
- Description: Modification of aircraft flight and service interphone system.
- Applied: November 11, 1999
- Status date: January 19, 2000
- Product: Aircraft, Large Airplane
- Certification basis: Part 21
- Data sheets: [TCDS A6WE](https://openairdocs.org/tcds/A6WE)
- Certificate PDF: https://openairdocs.org/files/sha256/61/a2/61a259f50dad2c58a1aaea49d479f63ad14b1f7d77c31d0d17e4023bbe907033
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/74B99E5DDB17EBA085256CC3000374E0.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/ST9429SC-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

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.

mnitttl £tatrs of amrrira Bcpartment of transportation — federal 2toiation administration upplemental ICgpe Certificate 9429 SC-D MD176 Tulsa, Oklahoma 74158-2809

•;fle&igm^w^fofe>6t0wtv^fw*>du^,tvtw^fa4em '•<*^!<;^!<a^/"5»''!<5^^''^<s^^ A6WE McDonnell Douglas DC-9-82/-83 Modification of aircraft flight and service interphone system in accordance with American Airlines Engineering Change Order (ECO) K2291XX dated 11/30/99 and Prototype Revision Form 7721-6 dated 1/18/00 and Prototype Revision Form 7721-6 dated 1/19/00 or later DAS 1SW approved revisions of each.

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.

Sa.e^rum^i^ra^r'^'^e' 11/11 /QQ 1/10/00 fSignatu R. D. Iliff DAS 1SW Coordinator re/ ^ ? f (Title)

FAAFouSl 10-2(10-68)

The FAX will reissue the certificate in the name of the transferee and forward it to him.

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 inJt)

## Every issue (1)

- January 19, 2000: Issued, Current. [certificate](https://openairdocs.org/files/sha256/61/a2/61a259f50dad2c58a1aaea49d479f63ad14b1f7d77c31d0d17e4023bbe907033)

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