# STC SA4-21

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Staggerwing Museum Foundation Inc., United States
- Description: Fuel system modified to provide dual wobble pumps and suction crossfeed and attendant plumbing.
- Applied: February 13, 1956
- Status date: October 6, 2006
- Product: Aircraft, Small Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A-2-582](https://openairdocs.org/tcds/A-2-582), [TCDS A-757](https://openairdocs.org/tcds/A-757)
- Certificate PDF: https://openairdocs.org/files/sha256/80/92/8092cb18b9bedb4598bf625e97133c9756ae95cb908ca848a5c09b812ea84d98
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/07A3534E555AF550862574F1006BBC27.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA4-21

## ADs that name it (0)

None.

## Approved models (2)

- Hawker Beechcraft Corporation Army AT-11 ([TCDS A-2-582](https://openairdocs.org/tcds/A-2-582))
- Hawker Beechcraft Corporation C18S ([TCDS A-757](https://openairdocs.org/tcds/A-757))

## 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: Staggerwing Museum Foundation, Inc.

560 Old Shelbyville Hwy Tullahoma, TN 37388

Part 4a of the Civil Air Regulations.

Original Product - Type Certificate Number : 757 and 2-582 Make : Beech Model : C18S and AT-11

Revise fuel system to provide dual wobble pumps and suction cross-feed and attendant plumbing in accordance with Airline Training, Inc. Drawings No. 10-013, 10-014, 10-015 all dated 02/13/56; or 12027 dated 12/10/58, 12028 as revised 12/30/58, 12035 dated 03/25/59, 12036 dated 01/05/59.

Airworthiness compatibility of this STC with all other major changes to the standard original model(s) shown above should be confirmed prior to installation of this STC. 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 reissued : May 22, 1967; August 15, 1968;

February 26, 1990; October 6, 2006 Date amended : September 11, 1959

Original signed by Robert D. Adamson

( Signature) Robert D. Adamson Program Manager Wichita Aircraft Certification Office (Title) Date of application : February 13, 1956 Date of issuance : February 16, 1956

## Every issue (1)

- October 6, 2006: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/80/92/8092cb18b9bedb4598bf625e97133c9756ae95cb908ca848a5c09b812ea84d98)

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