# STC SA01956AT-D

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: FFC Manufacturing, United States
- Description: Installation of replacement fuel cell assemblies
- Applied: July 9, 1999
- Status date: May 5, 2009
- Product: Aircraft, Single-Engine
- Certification basis: Part 3, Part 21
- Data sheets: [TCDS 2A4](https://openairdocs.org/tcds/2A4), [TCDS 6A1](https://openairdocs.org/tcds/6A1)
- Certificate PDF: https://openairdocs.org/files/sha256/b0/3e/b03ee6eebd1df92a26a0eef777e3de44a692b3f62eb903465bfbb6c05c446c92
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/E30EEF7D5A20A26F862575BA006676BA.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA01956AT-D

## ADs that name it (0)

None.

## Approved models (27)

- Twin Commander Aircraft Corporation 500 ([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))
- Twin Commander Aircraft Corporation 520 ([TCDS 6A1](https://openairdocs.org/tcds/6A1))
- Twin Commander Aircraft Corporation 560 ([TCDS 6A1](https://openairdocs.org/tcds/6A1))
- Twin Commander Aircraft Corporation 560-A ([TCDS 6A1](https://openairdocs.org/tcds/6A1))
- Twin Commander Aircraft Corporation 560-E ([TCDS 6A1](https://openairdocs.org/tcds/6A1))
- Twin Commander Aircraft Corporation 680 ([TCDS 2A4](https://openairdocs.org/tcds/2A4))
- Twin Commander Aircraft Corporation 680-E ([TCDS 2A4](https://openairdocs.org/tcds/2A4))
- Twin Commander Aircraft Corporation 680-F ([TCDS 2A4](https://openairdocs.org/tcds/2A4))
- Twin Commander Aircraft Corporation 680-F(P) ([TCDS 2A4](https://openairdocs.org/tcds/2A4))
- Twin Commander Aircraft Corporation 680-FL ([TCDS 2A4](https://openairdocs.org/tcds/2A4))
- Twin Commander Aircraft Corporation 680-FL(P) ([TCDS 2A4](https://openairdocs.org/tcds/2A4))
- Twin Commander Aircraft Corporation 680-T ([TCDS 2A4](https://openairdocs.org/tcds/2A4))
- Twin Commander Aircraft Corporation 680-V ([TCDS 2A4](https://openairdocs.org/tcds/2A4))
- Twin Commander Aircraft Corporation 680-W ([TCDS 2A4](https://openairdocs.org/tcds/2A4))
- Twin Commander Aircraft Corporation 681 ([TCDS 2A4](https://openairdocs.org/tcds/2A4))
- Twin Commander Aircraft Corporation 685 ([TCDS 2A4](https://openairdocs.org/tcds/2A4))
- Twin Commander Aircraft Corporation 690 ([TCDS 2A4](https://openairdocs.org/tcds/2A4))
- Twin Commander Aircraft Corporation 690C ([TCDS 2A4](https://openairdocs.org/tcds/2A4))
- Twin Commander Aircraft Corporation 690D ([TCDS 2A4](https://openairdocs.org/tcds/2A4))
- Twin Commander Aircraft Corporation 695 ([TCDS 2A4](https://openairdocs.org/tcds/2A4))
- Twin Commander Aircraft Corporation 695A ([TCDS 2A4](https://openairdocs.org/tcds/2A4))
- Twin Commander Aircraft Corporation 695B ([TCDS 2A4](https://openairdocs.org/tcds/2A4))
- Twin Commander Aircraft Corporation 720 ([TCDS 2A4](https://openairdocs.org/tcds/2A4))
- Twin CommanderAircraft Corporation 500-A ([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.

This certificate issued to

Part 3 of the Civil Air Regulations.

Description of Type Design Change: Installation of replacement fuel cell assemblies in accordance with FFC Manufacturing Drawings 6204-01 and 6362-01 dated July 7, 1999; or later FAA approved revisions.

Limitations and Conditions: 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 of those other previously approved modifications will introduce no adverse effects upon the airworthiness of the aircraft. If the holder agrees to permit another person to use this certificate to alter the product, the holder shall give the other person written evidence of that permission.

(See continuation 3 of 3)

FFC Manufacturing 4010 Pilot Dr., Suite 103 Memphis, TN 38118 6A1, 2A4 Make: Aero Commander Model: (See continuation 3 of 3) Date reissued: May 05, 2009

( Signature) Melvin D. Taylor Manager Atlanta Aircraft Certification Office

( Title)

Date of application: July 09, 1999

Date of issuance: November 01, 2001

FAA FORM 8110-2-1(10-69) PAGE 2 of 3 PAGES

Number SA01956AT-D

FAA FORM 8110-2-1(10-69) PAGE 3 of 3 PAGES

Number SA01956AT-D

Model Continuation:

Aero Commander: 500, 500A, 500B, 500U, 500S, 520, 560, 560A, 560E, 680, 680E, 680F, 680F(P), 680FL, 680FL(P), 680T, 680V, 680W, 681, 685, 690, 690C, 690D, 695, 695A, 695B, 720

Limitations and Conditions – Continued:

FFC Manufacturing part number 6204-501 will be a replacement for Aero Commander part numbers 630204-501(-503) and 5630204-501(-503) (-505) and FFC Manufacturing part number 6362-507 will be a replacement for Aero Commander part numbers 630062-507(-511) and 5630062-507(-511).

## Every issue (1)

- May 5, 2009: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/b0/3e/b03ee6eebd1df92a26a0eef777e3de44a692b3f62eb903465bfbb6c05c446c92)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.