# STC SA4781SW

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Textron Aviation Inc, United States
- Description: Installation of Dual Collins ALT-55B Radio Altimeter System.
- Applied: June 2, 1982
- Status date: January 25, 2017
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A21EA](https://openairdocs.org/tcds/A21EA)
- Certificate PDF: https://openairdocs.org/files/sha256/48/96/4896b1fbad4f9c2bd479dfa3c8fcac423cb9c233118813261c9bcc4db9d58ef3
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DFCBE8D42F28621F8625815900583DEB.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA4781SW

## ADs that name it (0)

None.

## Approved models (2)

- Bombardier Inc. CL-600-1A11 (CL-600) ([TCDS A21EA](https://openairdocs.org/tcds/A21EA))
- Bombardier Inc. CL-600-2A12 (CL-601) ([TCDS A21EA](https://openairdocs.org/tcds/A21EA))

## 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 Textron Aviation Inc.

One Cessna Boulevard Wichita, KS 67215 2 SA4781SW Federal Aviation Regulations.

25 Installation of Dual Collins ALT-55B Radio Altimeter System in accordance with Drawing List Number 600-018, Revision A, dated 9/15/82, or later FAA approved revision.

FAA Approved Flight Manual Supplement dated September 23, 1982, is required.

Compatibility of this modification with other previously approved modifications must be determined by the installer.

Canadair CL-600-1A11, -2A12 April 17, 1984; January 25, 2017 June 2, 1982 September 23, 1982 A21EA Mark Fuller STC ODA administrator ODA-100129-CE

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

To (Name and address of transferee)

From (Name and address of grantor)

## Every issue (2)

- January 25, 2017: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/48/96/4896b1fbad4f9c2bd479dfa3c8fcac423cb9c233118813261c9bcc4db9d58ef3)
- April 17, 1984: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/79/78/7978e2e33e55773d74185c2eb4205bf74309e13a7dc88a2696229cb00a131eae)

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