# STC SA4-1234

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: ROCKY TOP LEASING INC., United States
- Description: Installation of electrical low fuel warning device to indicate last 25 gallons of useable fuel in main (center) tank.
- Applied: May 19, 1960
- Status date: March 10, 2009
- Product: Aircraft, Small Multi-Engine
- Certification basis: 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/b9/ef/b9ef1f1e55e13902ca00680904711577f4556d907e062ef11373de8f3b388822
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/D5D806F7A48540D18625757700538652.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA4-1234

## ADs that name it (0)

None.

## Approved models (11)

- 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 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 560-F ([TCDS 2A4](https://openairdocs.org/tcds/2A4))
- 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-FL ([TCDS 2A4](https://openairdocs.org/tcds/2A4))
- Twin Commander Aircraft Corporation 720 ([TCDS 2A4](https://openairdocs.org/tcds/2A4))

## What the certificate says

This is OCR from the scanned FAA certificate. OCR can misread letters and numbers.

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number: SA4-1234 This certificate issued to: ROCKY TOP LEASING, INC.

1027 River Bend Drive Chattanooga, TN 37419 Part 3 of the Civil Sir Pegulations.

Original Product Type Certificate Number: 6A1, 2A4 Make:

Aero Commander Model:

500A, 500B, 560, 560A, 560E, 560F, 680, 680E, 680F, 680FL, 720 Description of Type Design Change: Installation of electrical low fuel warning device to indicate last 25 gallons of useable fuel in the main (center) tank, per Executive Radio and Aircraft Service, in Drawing No. E60M45.

Limitations and Conditions: . This approval should not be extended to other specific airplanes of this model on which other previously approved modifications are incorporated, unless it is determined that the interrelationship between this change and any of those other previously approved modifications will introduce no adverse effect upon the airworthiness of that airplanes. 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.

Date of Application: May 19, 1960 Date Reissued: November 4, 1970, March 10, 2009 Date of Issuance: July 25, 1960 Date Amended: January 14, 1964 FEDERAL AVIATION By Direction of the Administrator tbit Hai-Sil * Manager, Technical & Administrative Support TOMINISTRATO Staff, Los Angeles Aircraft Certification Office

TRANSFER ENDORSEMENT Transfer the ownership of the Supplemental Type Certificate Number to (Name of transferee) (Address of transfer) (Number and street) (City, State, and Zip code) trom (Name of grantor) (Print or type) (Address of grantor) (Number and street) (City, State, and Zip code) Extent of Authority (if licensing agreement):

Signature of grantor (In ink):

## Every issue (2)

- March 10, 2009: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/b9/ef/b9ef1f1e55e13902ca00680904711577f4556d907e062ef11373de8f3b388822)
- November 4, 1970: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/ca/05/ca05a4b365e48eaaa0288af123df952b7ab41ea4625a0334e7d6b4f7939d43d7)

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