# STC SA1687WE

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: United Airlines Inc, United States
- Description: Modify existing Collins Radio Company type FD-109 Flight Director installation to add 'Steering,' 'Airspeed-Hold,' and 'Auto Approach' modes. (727-22)
- Applied: November 30, 1967
- Status date: November 30, 2011
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21, Part 25
- Data sheets: [TCDS A3WE](https://openairdocs.org/tcds/A3WE)
- Certificate PDF: https://openairdocs.org/files/sha256/8e/b6/8eb6eef1556869963084da99dedc34b1a11c235fc9be5d132e95fffd1f51a610
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/99CE511C0531F7A08625799E00684818.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA1687WE

## ADs that name it (0)

None.

## Approved models (2)

- The Boeing Company 727 ([TCDS A3WE](https://openairdocs.org/tcds/A3WE))
- The Boeing Company 727C Series ([TCDS A3WE](https://openairdocs.org/tcds/A3WE))

## 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.

600 Jefferson Street Houston, Texas 77002 Part 25 of the Federal Aviation Regulations.

A3WE

Boeing

727-22, -22QC Description of Type Design Change : Modify existing Collins Radio Company type FD-109 Flight Director installation to add “Steering”, “Airspeed-H old”, and “Auto Approach” modes in accordance with FAA Approved United Air Lines Engineering and Maintenance Report F-1234 and FAA Approved United Air Lines Supplementary Revision 2 to Boeing Airplane Flight Manual D6-8727.1.

Limitations and Conditions: This approval should not be extended to other specific aircraft of this model on which other previously appr oved modifications are incorporated, unless it is determined that the interrelationship between this cha nge and any of those other previ ously approved modifications will introduce no adverse effect upon the airworthiness of that aircraft. If the holder agrees to permit another person to use this certificate to alter the product, th e holder shall give the other person written evidence of that permission.

This certificate and the supporting data, which is the basis for approval, shall remain in effect until surrendered, suspended, revoked or a termination date is otherwise established by the Administrator of the Federal Aviation Administration.

Date of application: November 30, 1967

Date of issuance: June 3, 1968

Date reissued: November 30, 2011

( Signature) Haifa Haj-Eid Supervisor, Technical & Administrative Support Staff Los Angeles Aircraft Certification Office ( Title)

NOTE:

**DO NOT DELETE THIS PAGE.**

**DO NOT ADD ANY DATA TO THIS PAGE.**

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## Every issue (1)

- November 30, 2011: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/8e/b6/8eb6eef1556869963084da99dedc34b1a11c235fc9be5d132e95fffd1f51a610)

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