# STC SA454GL

- Type: Supplemental type certificate
- Status: Current, Amended
- Holder: Shadin Company Inc, United States
- Description: Installation of Shadin Co. fuel flow indicating system.
- Status date: June 8, 2006
- Product: Aircraft, Small Multi-Engine
- Certification basis: Part 3, Part 21
- Data sheets: [TCDS A20SO](https://openairdocs.org/tcds/A20SO)
- Certificate PDF: https://openairdocs.org/files/sha256/cd/5f/cd5f0d62c4a4b7a932eb0a10c2e950d6ba7623cebe3ba248c21fff4fc2736df7
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/4DDB1CD0D299CADC862575E00052D0AC.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA454GL

## ADs that name it (0)

None.

## Approved models (3)

- The New Piper Aircraft Inc. PA-31 ([TCDS A20SO](https://openairdocs.org/tcds/A20SO))
- The New Piper Aircraft Inc. PA-31-325 ([TCDS A20SO](https://openairdocs.org/tcds/A20SO))
- The New Piper Aircraft Inc. PA-31-350 ([TCDS A20SO](https://openairdocs.org/tcds/A20SO))

## 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.

Part 3 of the Civil Air Regulations.

(See Type Certificate Data Sheet A20S0 for complete certification basis.)

Installation of a Shadin Company Fuel Flow Indicating System in accordance with Shadin Company Report number 4018, revised June 1, 1986, or other FAA approved version.

1) The approval of this change in type design applies to the above airplanes which are otherwise unmodified.

2) This approval should not be extended to other airplanes of these models that incorporate any other previously approved modification, unless it is determined that the interrelationship between this change and any other previously approved modification will introduce no adverse effect on the airworthiness of these airplanes.

3) 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.

Shadin Avionics 6831 Oxford Street St. Louis Park, MN 55426 A20S0 Make : Piper Aircraft, Inc.

Model : PA-31, PA-31-350, PA-31-325

Date of application : June 24, 1980

Date of issuance : September 29, 1980

Date reissued : June 8, 2006

Date amended : June 11, 1983, October 22, 1986

( Signature) Charles L. Smalley Manager, Systems & Flight Test Branch Chicago Aircraft Certification Office

( Title)

## Every issue (1)

- June 8, 2006: Amended, Current. [certificate](https://openairdocs.org/files/sha256/cd/5f/cd5f0d62c4a4b7a932eb0a10c2e950d6ba7623cebe3ba248c21fff4fc2736df7)

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