# STC SA1977SW

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: A D Howard Jr, United States
- Description: Modification of fuselage for installation of doppler antenna.
- Applied: April 21, 1975
- Status date: May 6, 1975
- Product: Aircraft, Small Airplane
- Certification basis: Part 21
- Data sheets: [TCDS 2A4](https://openairdocs.org/tcds/2A4)
- Certificate PDF: https://openairdocs.org/files/sha256/98/36/9836b99e668aff331e202a7c004b39d20f7c2caccbd2ebf64181da1088eb4268
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/7D217FCEC45B1A3C85256CC10083D39E.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA1977SW

## ADs that name it (0)

None.

## Approved models (9)

- Twin Commander Aircraft LLC 680-FL ([TCDS 2A4](https://openairdocs.org/tcds/2A4))
- Twin Commander Aircraft LLC 680-FL(P) ([TCDS 2A4](https://openairdocs.org/tcds/2A4))
- Twin Commander Aircraft LLC 680-T ([TCDS 2A4](https://openairdocs.org/tcds/2A4))
- Twin Commander Aircraft LLC 680-V ([TCDS 2A4](https://openairdocs.org/tcds/2A4))
- Twin Commander Aircraft LLC 680-W ([TCDS 2A4](https://openairdocs.org/tcds/2A4))
- Twin Commander Aircraft LLC 681 ([TCDS 2A4](https://openairdocs.org/tcds/2A4))
- Twin Commander Aircraft LLC 685 ([TCDS 2A4](https://openairdocs.org/tcds/2A4))
- Twin Commander Aircraft LLC 690 ([TCDS 2A4](https://openairdocs.org/tcds/2A4))
- Twin Commander Aircraft LLC 690A ([TCDS 2A4](https://openairdocs.org/tcds/2A4))

## 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.

Bnfttd $tatu of amnira Bepartmtnt of lEransportarion —federal Stoiation administration Supplemental t^pe Certificate LStf&tda&frrtAr.

SA1977SW A. D. Howard Jr.

6817 NW 43rd Street Bethany, Oklahoma 73008 3 PJpiatmad • Jrvduc£ —— .

Project A3218SW-S Civil Air Rockwell 680FL, 680FL(P), 680T, 680V, 680W. 681, 685, 690, 690A Modification of fuselage for installation of doppler antenna according to Drawing List 61269, Savision B, dated 5/7/75.

This doppler antenna Installation is applicable only with forward camera installation of STC SA135SSW or SA15S43W, v- : Jipril 21, 1975 Kay 6, 1975 dntiwH^ Don P. Watson Chlaf, Engineering and Manufacturing Branch -___ ' A ny alteration of this certificate » punishable by a fine of not exceeding II ,000, or imprisonment not exceeding 3 years, or both.

This ctitificatt may bt tnaafmtd jn accordance with FAR 21 .17.

F*>Fo«J**l !Q-

I NS'I Rl C | |ON>1 1 he lran-.li-r emlursemrnl lirtuw may IIP used lo notify ihi- appropriate FAA Regional Office of I he Irjnsler nt this Snpjjlrmrntal ]\\n Ci-nihraTe. t .

'['hi- I A A will n'issue I h< i crdficaii1 m the name of" the transferee and forward ii m him. \

TRANSFER ENDORSEMENT Transfer ilie ownership of Supplemental Type Certilicate Number to (Name nftransfmt) $ of trim \jetec).

Vunibrr and Ififrt I Cilf, .'tlalr, anil from (Name of grantor) (Print or type).

(Address of grantor) ^ .\umbt' and ft'rft I (Cill, Mali, anil ^11' rtdt) Extent ol Authority (if licensing agreement):

Signature of grantor (In ink):.

**C FAA AC 89-5S3G**

## Every issue (1)

- May 6, 1975: Issued, Current. [certificate](https://openairdocs.org/files/sha256/98/36/9836b99e668aff331e202a7c004b39d20f7c2caccbd2ebf64181da1088eb4268)

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