# STC SA7520SW

- Type: Supplemental type certificate
- Status: Current, Amended
- Holder: American Airlines Inc, United States
- Description: Replacing existing radio altimeter indicator with Collins vertical scale indicator, Model 339H-6.
- Applied: September 13, 1988
- Status date: April 3, 1989
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A49EU](https://openairdocs.org/tcds/A49EU)
- Certificate PDF: https://openairdocs.org/files/sha256/cf/1d/cf1d6ab55d0880d1411dbfbee13ac12b32d89198ba58227b6ee3a13fe5bfbecb
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/2B3B508CCC05F99385256CC20056A38A.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA7520SW

## ADs that name it (0)

None.

## Approved models (1)

- British Aerospace (England) BAe. 146-200A ([TCDS A49EU](https://openairdocs.org/tcds/A49EU))

## 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.

SSosa rf 3Krica Bepartmenc of transportation— federal Station administration Supplemental ICpje Certificate SA7520SW 190-991 AAM American Airlines, Inc.

P. O. Box 582809, MD 208 Tulsa, OK 74158-2809 tK>^ 25 y^, Federal Aviation A49EU British Aerospace BAe.l46-200A Replace existing radio altimeter indicator with Collins vertical scale indicator, model 339H-6 in accordance with Drawing List No. 881025, dated October 25, 1988, or later FAA approved revision.

This approval is limited to British Aerospace Model BAe.l46-200A, serial numbers E2051, E2053, E2054, E2055, E2057, and E2058 only. Compatibility of this modification with previously installed equipment must be determined by installer.

^e^rr^^i^ S&citm*n** September 13, 1988 @L&~*t*~S:

November 25, 1988 3L&~n*~JiJ: 12/27/88, 04/03/89, Rev. 2 J. D. Erickson, Manager, Rotorcraft Directorate, —Aircraft Certification Service fine of not exceeding tt ,000, or imprisonment not exceeding 3 years, or Tfiu trrtifieote may bt ttantjmtd in utcwdonct wil/t FAR 21.17.

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TRANSFER ENDORSEMENT Transfer the ownership of Supplemental Type Certificate Number to (Name of transferee) (Address of transferee) (Number and street) (City, State, and <7P code) from (Name of grantor) (Print or type) (Address of grantor) (.Wttnlhfr ami street) ( Cilr, Stale, and ^IP code ) Extent of Authority (if licensing agreement):

Signature of grantor (In ink):

## Every issue (1)

- April 3, 1989: Amended, Current. [certificate](https://openairdocs.org/files/sha256/cf/1d/cf1d6ab55d0880d1411dbfbee13ac12b32d89198ba58227b6ee3a13fe5bfbecb)

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