# STC SA551SW

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Pan Air Corporation, United States
- Description: Modify Beechcraft C18 cowl to fit Grumman G-21A.
- Applied: May 7, 1965
- Status date: November 30, 1978
- Product: Aircraft, Small Airplane
- Certification basis: Part 21
- Data sheets: [TCDS TC 654](https://openairdocs.org/tcds/TC%20654)
- Certificate PDF: https://openairdocs.org/files/sha256/14/ee/14ee45dde06653ad227e21528752bd86ee4f18408450cf60757ee75df3548af0
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/44F0FD43A9D538AB86257EDE0078A804.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA551SW

## ADs that name it (0)

None.

## Approved models (1)

- Grumman American Aviation Corporation G-21A (Army OA-9; Navy JRF-1; -2; -3; -4; -5; and -6B) ([TCDS TC 654](https://openairdocs.org/tcds/TC%20654))

## 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 $tatu of arnica Btpartment of '^transportation—federal 2toiation Administration Supplemental ICgpe Certificate SA551SW Pan Air Corporation P. 0. Box 26425 New Orleans, Louisiana 70126 v^wJ^wdeAjjctM^^ Jte.fi/6oijsirwfiwc£u4>6 Aero Bulletin 7A %<H^M wsjMSK?ft^fi& <S'gBiii0i I -<^jA* Bureau of Air Commercei <-%/ / f-I iSleaMlatt&nA/.1 17 ^ ._ ^^ Grunman G21A Modify Beechcraft C-18 cowl to fit Grunman G21A per Pan Air Corporation Drawings EL-0104 dated 5/7/65, EL-0104-1 dated 6/15/65, EL-0104-2 dated 6/15/65.

Compatibility of this modification with other previously approved modifications must be determined by the installer.

FAA Approved Airplane Flight Manual Supplement dated November 30, 1978, is required.

^ May 7, 1965 ^"& ^^««/ November 30, 1978 Revision 1 AUKUSt 31. 1965 -J ate Mtristu/u/ (Signature) Don P. Watson Chief, Engineering and Manufacturing Branch

**FAA FOUM 8110-2 (10-68)**

## Every issue (1)

- November 30, 1978: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/14/ee/14ee45dde06653ad227e21528752bd86ee4f18408450cf60757ee75df3548af0)

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