# STC SA128GL

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Aircraft Welding Co, United States
- Description: Replace existing asbestos or bellows exhaust seal with slip joint.
- Applied: November 25, 1975
- Status date: October 9, 1987
- Product: Aircraft, Small Airplane
- Certification basis: Part 21
- Data sheets: [TCDS 3A10](https://openairdocs.org/tcds/3A10), [TCDS 3A25](https://openairdocs.org/tcds/3A25), [TCDS A7CE](https://openairdocs.org/tcds/A7CE)
- Certificate PDF: https://openairdocs.org/files/sha256/52/88/5288e6fad11bcc5cf7111f7cbe0e4736807a49a80d0f998eaa28e1346be0750f
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DCD69976C605EF6F85256CC10080E16B.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA128GL

## ADs that name it (0)

None.

## Approved models (23)

- Cessna Aircraft Company 310F ([TCDS 3A10](https://openairdocs.org/tcds/3A10))
- Cessna Aircraft Company 320 ([TCDS 3A25](https://openairdocs.org/tcds/3A25))
- Cessna Aircraft Company 320-1 ([TCDS 3A25](https://openairdocs.org/tcds/3A25))
- Cessna Aircraft Company 320A ([TCDS 3A25](https://openairdocs.org/tcds/3A25))
- Cessna Aircraft Company 320B ([TCDS 3A25](https://openairdocs.org/tcds/3A25))
- Cessna Aircraft Company 320C ([TCDS 3A25](https://openairdocs.org/tcds/3A25))
- Cessna Aircraft Company 320D ([TCDS 3A25](https://openairdocs.org/tcds/3A25))
- Cessna Aircraft Company 320E ([TCDS 3A25](https://openairdocs.org/tcds/3A25))
- Cessna Aircraft Company 320F ([TCDS 3A25](https://openairdocs.org/tcds/3A25))
- Cessna Aircraft Company 340 ([TCDS 3A25](https://openairdocs.org/tcds/3A25))
- Cessna Aircraft Company 401 ([TCDS A7CE](https://openairdocs.org/tcds/A7CE))
- Cessna Aircraft Company 401A ([TCDS A7CE](https://openairdocs.org/tcds/A7CE))
- Cessna Aircraft Company 401B ([TCDS A7CE](https://openairdocs.org/tcds/A7CE))
- Cessna Aircraft Company 402 ([TCDS A7CE](https://openairdocs.org/tcds/A7CE))
- Cessna Aircraft Company 402A ([TCDS A7CE](https://openairdocs.org/tcds/A7CE))
- Cessna Aircraft Company 402B ([TCDS A7CE](https://openairdocs.org/tcds/A7CE))
- Cessna Aircraft Company 411 ([TCDS A7CE](https://openairdocs.org/tcds/A7CE))
- Cessna Aircraft Company 411A ([TCDS A7CE](https://openairdocs.org/tcds/A7CE))
- Cessna Aircraft Company 414 ([TCDS A7CE](https://openairdocs.org/tcds/A7CE))
- Cessna Aircraft Company 421 ([TCDS A7CE](https://openairdocs.org/tcds/A7CE))
- Cessna Aircraft Company 421A ([TCDS A7CE](https://openairdocs.org/tcds/A7CE))
- Cessna Aircraft Company T310P ([TCDS 3A10](https://openairdocs.org/tcds/3A10))
- Cessna Aircraft Company T310Q ([TCDS 3A10](https://openairdocs.org/tcds/3A10))

## 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.

Hmttfl Starts of Bcpartment of ^transportation - federal auiatwn administration Supplemental HTpe Certificate SA128GL Aircraft Welding Company P.O. Box 300 Addison, TX 75001 3 Civil Air (See Type Certificate Data Sheet Nos. 3A10/3A25/A7CE for complete certification basis.)

™*"^ •- luvrdtv- - 3A10/3A25/A7CE Cessna T310P, T310Q, 320, 320-1, 320A, 320B, 320C.

32QD, 320E, 320F, 340, 411, 411A, 401, 401A, 401B, 402, 402A, 402B, 421, 421A, 414 Replace existing asbestos or bellows exhaust seal with slip joint in accordance with E. C. Aviation Drawing ECA-75112, pages 1 through 3, dated 11/28/75.

a nff 'Jt- c'nj This approval should not be extended to other aircraft of these models on which other previously approved modifications are incorporated, unless it is determined by the installer that the interrelationship between this change and any other previously approved modifications will introduce no adverse effect upon the airworthiness of that aircraft.

- eta/a -v <J /Sif November 25, 1975 t 1976 December 15, 1978;

October 9, 1987 V——•——•———-f W. F. /orn Manager, Chicago Aircraft Certification Office. ACE-115C Central Rpginn (Tatr> TAu enlijxatr majr be ttoniferrtd in aavtdaiur with ^AK 21.17.

1 NS 1'R.UC FIONS '['tit lidiisfci rndoiisrmciit below may be used 10 notil> ihc .ippropriaic FA A I1 ci;ioiia1 Of lift- of the transfer of this -Supplemental Ty\w Cernfieaic Thr I'AA ivill ri-isiuc thr <.rr[ificalr in ihc name ol ihr Iranifcrct and li>[Ujril it Lo him.

TRANSFER ENDORSEMENT Transfer the ownership of Supplemental Type (Certificate Number __ to (Namr of transferee) ___ (Address oj traiis/free) ._ (Jfurnbrr and itrttt) (City, Stati, and ZIP aideJ from (Name of grantor) (Print or type.)

(Address oj grantor) i and Itrtei} (Ct&, Slatr, and JJP cadr ) Extent of Authority (if licensing agreement):

Signature of grantor (In ink):.

## Every issue (1)

- October 9, 1987: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/52/88/5288e6fad11bcc5cf7111f7cbe0e4736807a49a80d0f998eaa28e1346be0750f)

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