# STC SA5460SW

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Blackhawk Modifications Inc., United States
- Description: Install Pratt & Whitney PT6A-21engines in place of PT6A-20A engines
- Applied: May 29, 1983
- Status date: December 6, 2004
- Product: Aircraft, Small Multi-Engine
- Certification basis: Part 3, Part 21
- Data sheets: [TCDS 3A20](https://openairdocs.org/tcds/3A20)
- Certificate PDF: https://openairdocs.org/files/sha256/e0/41/e0419483fc62e38410fb0442c11e9285b6454b949153b4ef64a7ea61b84a9f83
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/F561F2D28F2D1BE786256F8800570B10.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA5460SW

## ADs that name it (0)

None.

## Approved models (1)

- Raytheon Aircraft Company C90 ([TCDS 3A20](https://openairdocs.org/tcds/3A20))

## 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.

Number SA5460SW This Certificate issued to Blackhawk Modifications, Inc.

1800 E. Sahara Drive Las Vegas, NV 89104

Part 3 of the Civil Air Regulations.

Original Product Type Certificate Number : 3A20 Make : Beech

Model : C-90

Install Pratt & Whitney PT6A-21 engines in place of PT6A-20A engines in accordance with Drawing 03-001, Revision A dated 6/16/83, Sheets 1 and 2, or later FAA approved revision.

1. FAA Approved Airplane Flight Manual Supplement dated June 17, 1983, is required.

2. Eligible on Beech C-90 with PT6A-20A engines only.

3. Compatibility of this design change with previously approved modifications must be 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.

Date of application : May 29, 1983

Date of issuance : June 17, 1983 Date reissued : December 6, 2004

( Signature) S. Frances Cox, Manager Special Certification Office, Southwest Region

(Title)

## Every issue (1)

- December 6, 2004: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/e0/41/e0419483fc62e38410fb0442c11e9285b6454b949153b4ef64a7ea61b84a9f83)

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From OpenAirDocs.org, an independent open copy of FAA and NTSB data. Only the Federal Register edition on govinfo.gov is the official legal text of an AD.