# STC SA1807NM

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Excalibur 421 LLC, United States
- Description: Installation of two 68.5 U. S. Gallon usable fuel nacelle tanks and fuel system
- Applied: December 31, 1981
- Status date: April 13, 2017
- Product: Aircraft, Small Airplane
- Certification basis: Part 21
- Data sheets: [TCDS A7CE](https://openairdocs.org/tcds/A7CE)
- Certificate PDF: https://openairdocs.org/files/sha256/28/8a/288aed4e51483d4246ed892544864dd3b8d2317c234b2ae52ce73d51468ae67c
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/6E8F8927884366E2862581070055F4F2.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA1807NM

## ADs that name it (0)

None.

## Approved models (1)

- Cessna Aircraft Company 421 ([TCDS A7CE](https://openairdocs.org/tcds/A7CE))

## 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.

Excalibur 421, LLC 4550 South El Pomar Road Templeton, California 93465 *23

A7CE Cessna 421 modified per STC SA1361SO

Installation of two 68. 5 U. S. Gallon usable fuel nacelle tanks and fuel system in accordance with Riley Aircraft Manufacturing, Inc., FAA Approved Master Drawing List No. 1200001, Revision “C”, dated November 5, 1982, or later FAA approved revisions, plus Riley FAA Approved AFM Supplement dated November 29, 1982, or later FAA approved revisions to Riley Turbine Eagle Cessna 421C AFM dated August 17, 1982, or later approved revisions.

This approval of this change in type design applies basically t o Cessna Model 421C modified by STC SA1361SO only. This approval should not be extended to other specific airplanes of these models on which other previously approved modifications are incorporated unless it determined by the installer that the interrelat ionship between this change and any of the previously approved modifications will introduce no adverse effect upon the airworthiness of the above 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.

December 31, 1981

November 29, 1982

February 13, 2013, April 13, 2017

(Signature) Steve Bogucki, Manager, Technical & Support Staff Los Angeles Aircraft Certification Office (Title)

Transfer the ownership of the Supplemental Type Certificate Number to (Name of transferee) (Address of transfer) (Number and street)

(City, State, and Zip code) from (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 (3)

- April 13, 2017: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/28/8a/288aed4e51483d4246ed892544864dd3b8d2317c234b2ae52ce73d51468ae67c)
- February 13, 2013: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/86/cb/86cb964dede5d069ae28c0b3256d784b190e0a7417185afda1190cff0a818f75)
- March 22, 1990: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/c0/cf/c0cf7b347e50d8f976adfbe0b644132854de4542d88fc46b4efb7cce94ed7399)

---
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.