# STC SA1521GL

- Type: Supplemental type certificate
- Status: Current, Amended
- Holder: Knots 2U Ltd, United States
- Description: Installation of Flap, Aileron, Flap/Fuselage, and Stabilator Gap Seals.
- Applied: September 6, 1990
- Status date: March 29, 2010
- Product: Aircraft, Single-Engine
- Certification basis: Part 3, Part 21
- Data sheets: [TCDS A3SO](https://openairdocs.org/tcds/A3SO)
- Certificate PDF: https://openairdocs.org/files/sha256/40/19/401950f410887fb73773e7e8a5f743fc19f6fd9d9a93effd238d2f6849f06b91
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/D8512AE4CB0D45EC862576FF004824E1.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA1521GL

## ADs that name it (0)

None.

## Approved models (7)

- Piper Aircraft Inc. PA-32-301 ([TCDS A3SO](https://openairdocs.org/tcds/A3SO))
- Piper Aircraft Inc. PA-32-301FT ([TCDS A3SO](https://openairdocs.org/tcds/A3SO))
- Piper Aircraft Inc. PA-32-301T ([TCDS A3SO](https://openairdocs.org/tcds/A3SO))
- Piper Aircraft Inc. PA-32-301XTC ([TCDS A3SO](https://openairdocs.org/tcds/A3SO))
- Piper Aircraft Inc. PA-32R-301 (HP) ([TCDS A3SO](https://openairdocs.org/tcds/A3SO))
- Piper Aircraft Inc. PA-32R-301 (SP) ([TCDS A3SO](https://openairdocs.org/tcds/A3SO))
- Piper Aircraft Inc. PA-32R-301T ([TCDS A3SO](https://openairdocs.org/tcds/A3SO))

## 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.)

Installation of Flaps, Aileron Flap/Fuselage and Stabilator Gap seals in accordance with Knots 2U, Ltd. Installation and Maintenance Manual , document number 32FGS-M, revision F, dated 2/05/2010 or later FAA approved revision.

1) Compatibility of this design change with previously approved modifications must be determined by the installer.

2) This approval should not be extended to other specific airplanes of this model on which previously approved modifications are incorporated, unless it is determined that the interrelationship between this change and any other of those previously approved modifications will introduce no adverse effect upon the airworthiness of that airplane.

3) If the holder agrees to permit another person to use this certificate to alter a product, the holder shall give the other person written evidence of that permission.

Knots 2U, Ltd.

703 Airport Drive Burlington, WI 53105

A3SO Make : Piper Aircraft, Inc.

Model : PA-32-301 ; PA-32-301T ; PA-32R-301 ; PA-32R-301T ;

PA-32R-301(SP) ; PA-32R-301(HP) ; PA-32-301FT ; PA-32- 301XTC Date of application : September 6, 1990

Date of issuance : October 11, 1990 Date reissued : May 7, 1997

Date amended : July 15, 1997 ; October 13, 1999 ; March 29, 2010

( Signature) Mary Ellen A. Schutt Manager, Airframe and Administrative Branch Chicago Aircraft Certification Office

( Title)

FAA FORM 8110-2-1(10-69) PAGE 2 of 3 PAGES

## Every issue (1)

- March 29, 2010: Amended, Current. [certificate](https://openairdocs.org/files/sha256/40/19/401950f410887fb73773e7e8a5f743fc19f6fd9d9a93effd238d2f6849f06b91)

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