# STC SA3-307

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Preferred Improvements LLC, United States
- Description: Installation of 145-gallon fuel tanks. Installation of 252-gallon fuel tanks.
- Applied: July 3, 1958
- Status date: December 7, 2018
- Product: Aircraft, Large Airplane
- Certification basis: Part 21
- Data sheets: [TCDS A-618](https://openairdocs.org/tcds/A-618), [TCDS A-669](https://openairdocs.org/tcds/A-669)
- Certificate PDF: https://openairdocs.org/files/sha256/23/a6/23a65c0a4ba3dc74edb91f9e8d5f593ba86a7d08286194ea5955e014c3d75e1a
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/A5DD36A16F8707FA8625836600609DCD.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA3-307

## ADs that name it (0)

None.

## Approved models (14)

- The Boeing Company DC3-G102 ([TCDS A-618](https://openairdocs.org/tcds/A-618))
- The Boeing Company DC3-G102A ([TCDS A-618](https://openairdocs.org/tcds/A-618))
- The Boeing Company DC3-G103A ([TCDS A-618](https://openairdocs.org/tcds/A-618))
- The Boeing Company DC3-G202A ([TCDS A-618](https://openairdocs.org/tcds/A-618))
- The Boeing Company DC3A-S1C3G ([TCDS A-669](https://openairdocs.org/tcds/A-669))
- The Boeing Company DC3A-S1CG ([TCDS A-669](https://openairdocs.org/tcds/A-669))
- The Boeing Company DC3A-S4C4G ([TCDS A-669](https://openairdocs.org/tcds/A-669))
- The Boeing Company DC3A-SC3G ([TCDS A-669](https://openairdocs.org/tcds/A-669))
- The Boeing Company DC3A-SCG ([TCDS A-669](https://openairdocs.org/tcds/A-669))
- The Boeing Company DC3C-R-1830-90C ([TCDS A-669](https://openairdocs.org/tcds/A-669))
- The Boeing Company DC3C-S1C3G ([TCDS A-669](https://openairdocs.org/tcds/A-669))
- The Boeing Company DC3C-S4C4G ([TCDS A-669](https://openairdocs.org/tcds/A-669))
- The Boeing Company DC3C-SC3G ([TCDS A-669](https://openairdocs.org/tcds/A-669))
- The Boeing Company DC3D-R-1830-90C ([TCDS A-669](https://openairdocs.org/tcds/A-669))

## 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.

4a Civil Air *

1. Installation of 145-gallon fuel Tanks.

2. Installation of 252 gallon fuels tanks.

Data required Remmert-Werner Drawing No’s SK-10090, SK-10091, SK-10092, SK-10093, SK-10171, SK-10191, SK-10192, or later FAA Approved revision.

For Item 1: Remmert-Werner Aircraft Flight Manual Rev. I, dated February 4. 1955, to Pan American Airways Aircraft Flight Manual dated September 15, 1954. For Item: 2: Aircraft Flight Manual Rev.1 dated July 25, 1958, to basic Remmert-Werner Aircraft Flight Manual dated March 25, 2955. This approval should not be extended to other aircraft of this model 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 effect upon the airworthiness of that aircraft.

Preferred Improvements, LLC 11234 Hackett Road Apple Creek, OH 44606

* A-618, A-669

* Douglas * DC-3 All Models July 3, 1958

July 24, 1958

10/1/58; 3/25/81; 6/30/83; 3/7/14;

12/5/17; 12/31/17; 12/07/2018.

Original Signed By:

Monica L. Nemecek

(Signature) Monica L. Nemecek Manager, Airframe & Administrative Section Chicago ACO Branch

(Title)

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

## Every issue (3)

- December 7, 2018: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/23/a6/23a65c0a4ba3dc74edb91f9e8d5f593ba86a7d08286194ea5955e014c3d75e1a)
- December 13, 2017: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/09/af/09af9f5b09a12de551409dcc587ce39d9742704e849c56ebbbe2703e97cedf78)
- March 7, 2014: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/c5/58/c5588d9855e442c72870ea7ee2b012cd9871505cb12a019e57415ffac988c859)

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