# STC SA553GL

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Jorden Alexander Grieff
- Description: Remove tricycle landing gear and install conventional landing gear. (172C S/N 28000 THRU17249544 FOR ALL MODELS)
- Status date: February 15, 2025
- Data sheets: 3A12, 3A12, 3A12, 3A12
- Certificate PDF: https://openairdocs.org/files/sha256/28/33/2833520a67871704fa3c84bd488f3b5e2bfeed70580576ee68e70373da6f8a10
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID158657809820250312135050.0001
- Page: https://openairdocs.org/stc/SA553GL

## ADs that name it

None.

## Approved models (4)

- Textron Aviation Inc. 172 (TCDS 3A12)
- Textron Aviation Inc. 172A (TCDS 3A12)
- Textron Aviation Inc. 172B (TCDS 3A12)
- Textron Aviation Inc. 172C (TCDS 3A12)

## 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.

SA553GL Jorden Alexander Grieff 3 Central Plaza Rome, GA 30161 3 Civil Air Regulations.

3A12 Cessna 172,172A,172B, 172C (Serial Numbers 28000 - 17249544 for all models )

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

Continued on page 3 10/8/1980 2/15/2025 8/26/1981 9/17/1990 for Paul Nguyen Manager, Central Certification Branch Compliance & Airworthiness Division

3 Remove tricycle landing gear and install conventional landing gear according to "Installation Instructions to Convert Cessna Aircraft 172 to Conventional Landing Gear Configurations Aircraft"' revised November 27, 1989; and drawing titled "Tail Cone Assembly", RevisionA, dated December 1, 1988, FAA Approved March 30, 1990, or later FAA approved revisions.

(See Type Certificate Data Sheet No. 3A12 for complete certification basis)

SA553GL 02/15/25 3

SA553GL 02/15/25 Limitations and Conditions (continued):

2. 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.

----------------------------------------------------------END---------------------------------------------------- 3 3 Add Page

## Every issue (2)

- February 15, 2025: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/28/33/2833520a67871704fa3c84bd488f3b5e2bfeed70580576ee68e70373da6f8a10)
- September 17, 1990: Amended, Historical. [certificate](https://openairdocs.org/files/sha256/1b/f1/1bf1261d2df7f97911df197ef1a00104fee5ee8628e9ca70ca30a7017e806ae5)

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