# STC SA3487SW-D

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Century Flight Systems Inc, United States
- Description: Installation of Century automatic flight system model Ak990 consisting of a Century 41 Autopilot/flight director with yaw damper
- Applied: May 2, 1990
- Status date: November 27, 1990
- Product: Aircraft, Large Airplane
- Certification basis: Part 21
- Data sheets: [TCDS A-669](https://openairdocs.org/tcds/A-669)
- Certificate PDF: https://openairdocs.org/files/sha256/1b/f9/1bf92ba762d1d545087ab3e09cb28633db0d020b32ca7f1fe8387efe8186089f
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/0C14CFB6379F30B985256CC2000A988C.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA3487SW-D

## ADs that name it (0)

None.

## Approved models (5)

- The Boeing Company DC3A-S1C3G ([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 DC3C-R-1830-90C ([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.

ttnitrd gtattt of 3nmca department of transportation —federal Elation Administration Supplemental 'Cgpe Certificate <sbusmv€>r' SA 3487 SW-D Century Flight Systems, Inc.

FM 1195 P.O. Box 610 Mineral Wells, TX 76067 JA&Ju/i&deAic^jfc^jA&^dbu^^ ^^ 41, ^.dif, Civil Aeronautical fj . . J (sfl / f S i .^^ t • A f A/ / A £ C* OCJr^at/n^u- i/siwciuc& ——<J>uSi4' vAwtjftcMfnS tMrnfar*: t\—Quy McDonnell Douglas Corporation DC3-TP67 (see page 2) Installation of Century Automatic Flight System Model Ak990 consisting of a Century 41 Autopilot/Flight Directer with Yaw Damper per Bulletin No.2047 Revision (2) dated 11-20-90 and Master Drawing List No.87A1211 Revision A dated 11-20-90 and/or later-FAA/DAS approved revision.

FAA/DAS Approved Airplane Flight Manual Supplement P/N 68S1050, dated 11-26-90 is required. Also, Century 41 Pilot's Operating Handbook 68S803 dated 1-85 or later applicable revision.

See page 2 for additional limitations.

£&/tt<Ji,r : 5-2-90 11-27-90 (Signature)- F. J. Kubina DAS Staff Coordinator, DAS 7SW (r,tle)

This cerlificatt may be Iratuftrred in accordance with f-'AK 21.17.

FAAFouill 10-2(10-68)

Bcpartmtnt of ^transportation—Jpedcral attotion Administration Supplemental ICgpe Certificate(Continuation $heet) i/YMWWeV SA 3487 SW-D ELIGIBLE MODELS:

DC3C-SC3G, S1C3G, S4C4G, S3C4G, R-1830-43, R-1830-43A, R1830-49, R-1830-57, R-1830-65.R-1830-67, R-1830-75, R-1830-82, R-1830-90C, R-1830-90D, R-1830-92, R-1830-94, R-1830-96, R-2000-7M2, R-2000-D5. When modified by STC SA 4840 NM (PT6A-67R engines). Above models also eligible with.

STC SA 996 GL (metallized controls) installed.

LIMITATIONS AND CONDITIONS (continued) 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 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 the aircraft.

PAA FORM ano-2-i (io-w) This terlifieate may 4« trantjtn$d in atcordanci with FAR 21.47.

**PAGE 2 OP 2 PAGES**

INSTRUCTIONS: The transfer endortement below may the transfer of thu Supplemental Type Certificate.

be u»ed w notify the appropriate FAA Regional Office of The FAA will reiuuc the certificate in the name of the traruferec and forward it to him.

TRANSFER ENDORSEMENT Transfer the ownership of Supplemental Type Certificate Number to (Name of transferee) _ (Address of transferee) __ from (Name of grantor) (Print or type).

(Address of grantor) __ Extent of Authority (if licensing agreement):

Signature of grantor (In ink):

..,<<-. o n ««««_««»-nv>

## Every issue (1)

- November 27, 1990: Issued, Current. [certificate](https://openairdocs.org/files/sha256/1b/f9/1bf92ba762d1d545087ab3e09cb28633db0d020b32ca7f1fe8387efe8186089f)

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