# STC SA8453SW

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Metrea Special Aerospace ISR Inc., United States
- Description: Replace the o-ring seals in the landing gear lower strut.
- Applied: August 20, 1992
- Status date: April 29, 2025
- Product: Aircraft, Small Airplane
- Data sheets: [TCDS 6A1](https://openairdocs.org/tcds/6A1)
- Certificate PDF: https://openairdocs.org/files/sha256/3f/33/3f33c56dac77959b7a9c1cf18b6c44706f4ac7af2b2085e00a6482d81a4d04fe
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID146420766720250519145824.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA8453SW

## ADs that name it (0)

None.

## Approved models (4)

- Twin Commander Aircraft Corporation 500-A ([TCDS 6A1](https://openairdocs.org/tcds/6A1))
- Twin Commander Aircraft Corporation 500-B ([TCDS 6A1](https://openairdocs.org/tcds/6A1))
- Twin Commander Aircraft Corporation 500-S ([TCDS 6A1](https://openairdocs.org/tcds/6A1))
- Twin Commander Aircraft Corporation 500-U ([TCDS 6A1](https://openairdocs.org/tcds/6A1))

## 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.

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Original Product 7\SH&HUWLILFDWH1XPEHU Make:

SA8453SW Metrea Special Aerospace, ISR Inc.

1100 N. Broadway Ave, Suite 200 Oklahoma City, OK 73103 Part 3 Civil Air Regulations 6A1 Twin Commander 500A, 500B, 500U, 500S Replacement of O-ring Seals in the landing gear, lower strut seal. Data required:

1. Gulfstream Aerospace Technologies Drawing List No. GSDL-001, Rev. A, dated August 10, 1992, and

2. Gulfstream Aerospace Technologies Installation Instructions No. GSI-001, Rev. A, dated August 10, 1992, or later FAA Approved revisions for 1 or 2.

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

August 20, 1992 September 14, 1998, April 29, 2025 October 13, 1992 for Paul Nguyen Manager, Central Certification Branch Compliance & Airworthiness Division Aircraft Certification Service 2

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Too (Name and address of transferee):

Date oI transfer:

SA8453SW 2

## Every issue (3)

- April 29, 2025: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/3f/33/3f33c56dac77959b7a9c1cf18b6c44706f4ac7af2b2085e00a6482d81a4d04fe)
- February 26, 2007: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/87/d0/87d09a1d9df6f85abf40bb23067c0fa15ebd09842a5319b20db679f7d43a8deb)
- December 4, 2006: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/a3/66/a3668f5f2008d4b248ac6d889f8c73655ac68a87995b1a2cd255a5c046628940)

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