# STC SA00417BO

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: T3 Tailwheel Suspension Systems, USA
- Description: Installation of T3 Tailwheel Suspension Systems Suspension
- Applied: February 13, 2022
- Status date: July 3, 2023
- Product: Aircraft, Small Airplane
- Data sheets: [TCDS 1A2](https://openairdocs.org/tcds/1A2)
- Certificate PDF: https://openairdocs.org/files/sha256/2e/83/2e837a96fe33d9fd111c29ff4e64d135b6d3c3a89f676c448cfad2fd9888625c
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID162779463820231011185855.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA00417BO

## ADs that name it (0)

None.

## Approved models (18)

- Piper Aircraft Inc. PA-18 ([TCDS 1A2](https://openairdocs.org/tcds/1A2))
- Piper Aircraft Inc. PA-18-105 (Special) ([TCDS 1A2](https://openairdocs.org/tcds/1A2))
- Piper Aircraft Inc. PA-18-125 (Army L-21A) ([TCDS 1A2](https://openairdocs.org/tcds/1A2))
- Piper Aircraft Inc. PA-18-135 ([TCDS 1A2](https://openairdocs.org/tcds/1A2))
- Piper Aircraft Inc. PA-18-150 ([TCDS 1A2](https://openairdocs.org/tcds/1A2))
- Piper Aircraft Inc. PA-18A ([TCDS 1A2](https://openairdocs.org/tcds/1A2))
- Piper Aircraft Inc. PA-18A-135 ([TCDS 1A2](https://openairdocs.org/tcds/1A2))
- Piper Aircraft Inc. PA-18A-150 ([TCDS 1A2](https://openairdocs.org/tcds/1A2))
- Piper Aircraft Inc. PA-18AS-125 ([TCDS 1A2](https://openairdocs.org/tcds/1A2))
- Piper Aircraft Inc. PA-18AS-135 ([TCDS 1A2](https://openairdocs.org/tcds/1A2))
- Piper Aircraft Inc. PA-18AS-150 ([TCDS 1A2](https://openairdocs.org/tcds/1A2))
- Piper Aircraft Inc. PA-18S ([TCDS 1A2](https://openairdocs.org/tcds/1A2))
- Piper Aircraft Inc. PA-18S-105 (Special) ([TCDS 1A2](https://openairdocs.org/tcds/1A2))
- Piper Aircraft Inc. PA-18S-125 ([TCDS 1A2](https://openairdocs.org/tcds/1A2))
- Piper Aircraft Inc. PA-18S-135 ([TCDS 1A2](https://openairdocs.org/tcds/1A2))
- Piper Aircraft Inc. PA-18S-150 ([TCDS 1A2](https://openairdocs.org/tcds/1A2))
- Piper Aircraft Inc. PA-19 (Army L-18C) ([TCDS 1A2](https://openairdocs.org/tcds/1A2))
- Piper Aircraft Inc. PA-19S ([TCDS 1A2](https://openairdocs.org/tcds/1A2))

## 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.

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number SA00417BO

FAA Form 8110-2 (03/21) SUPERSEDES PREVIOUS EDITION Page 1 of 3 This certificate issued to:

T3 Tailwheel Suspension Systems 88 Calderwood Lane Lincolnville, Maine 04849 Part 3 of the Civil Aviation Regulations.

Original Product - Type Certificate Number: 1A2 Make: Piper Aircraft, Inc.

Model: PA-18, PA-18S, PA-18 “105” (Special), PA-18S “105” (Special), PA-18A, PA-18 “125” (Army L-21A), PA- 18S “125”, PA-18AS “125”, PA-18 “135 (Army L- 21B), PA-18A “135” PA-18S “135”, PA-18AS “135” PA-18 “150”, PA-18A “150”, PA-18S “150”, PA-18AS “150”, PA-19 (Army L-18C), PA-19S Description of Type Design Change:

Installation of T3 Tailwheel Suspension Systems Suspension in accordance with Master Document List (MDL) T3-2021-1A2-MDL, Rev. IR, dated 4/1/2023, or later FAA approved revision.

This modification does not include an Airplane Flight Manual Supplement (AFMS).

Limitations and Conditions: See Page 3 of 3

Date of Application: February 13, 2022 Date reissued:

By direction of the Administrator Signature for Christina M. Underwood Manager, East Aircraft Certification Branch Title July 3, 2023

Number SA00417BO

FAA Form 8110-2 (03/21) SUPERSEDES PREVIOUS EDITION Page 2 of 3

To (Name and address of transferee) Name:

Address (Number and Street, City, State, and ZIP Code):

From (Name and address of grantor) Name:

Address (Number and Street, City, State, and ZIP Code):

(Continuation Sheet) Number SA00417BO

FAA Form 8110-2 (03/21) SUPERSEDES PREVIOUS EDITION Page 3 of 3

1. Maintenance must be in accordance with Instructions for Continued Airworthiness (ICA), Document Number ABI-DST3-ICA, Revision B., dated November 30, 2022, or later FAA accepted revision.

2. The ICA must be made available to the operator at the time of installation.

3. The installer must determine whether this design change is compatible with previously approved modifications.

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

Certification Basis:

Based on 14 CFR § 21.115 and § 21.101, and the FAA policy for design changes that are identified as not significant in FAA Order 8110.48, the certification basis for the Make Model aircraft is as follows:

a. The type certification basis for parts not changed or not affected by the change is shown on TCDS 1A2.

b. The modification certification basis for parts changed or affected by the change since the date of application was determined to be:

Regulations at the latest amendment 23-0 through 23-63 None Regulations at an intermediate amendment None Regulations at the amendment level in TCDS 1A2 CAR 3.143, 3.144, 3.145, 3.146, 3.171, 3.172, 3.173, 3.174, 3.244, 3.246(a)(c), 3.250, 3.251,

3.252, 3.291, 3.292, 3.293, 3.294, 3.295, 3.296, 3.301, 3.302, 3.305, 3.306, 3.307, 3.351,

3.352, 3.353, 3.354, 3.355 ------------------------------------------------------------END-------------------------------------------------------

## Every issue (1)

- July 3, 2023: Issued, Current. [certificate](https://openairdocs.org/files/sha256/2e/83/2e837a96fe33d9fd111c29ff4e64d135b6d3c3a89f676c448cfad2fd9888625c)

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