# STC SA1105WE

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: United Airlines Inc, United States
- Description: Installation of dual Collins AL-101 Radio Altimeter Systems in accordance with FAA Approved United Air Lines Report No. F-1047, or later FAA approved revisions.
- Applied: September 10, 1965
- Status date: November 30, 2011
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A3WE](https://openairdocs.org/tcds/A3WE)
- Certificate PDF: https://openairdocs.org/files/sha256/fd/84/fd84d9f6da2eb1be20f06cbf26a9d77408b9364168e6f45dd3cbb4a9988f9867
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/51B5784E846AAB0386257992006077C0.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA1105WE

## ADs that name it (0)

None.

## Approved models (1)

- The Boeing Company 727 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 4b of the Civil Air Regulations Original Product Type Certificate Number :

A3WE

Boeing

B727-22 Description of Type Design Change : Installation of dual Collins AL-101 Radio Altimeter Systems in accordance with FAA Approved United Air Lines Report No. F-1047, or later FAA approved revisions.

Limitations and Conditions: The approval of this change in the type design applies basically to Boeing Model 727 aircraft. This approva l should not be extended to other specific airplanes of this model on which other previously approved m odifications are incorporated, unless it is determined that the interrelationship between th is change and any of those other previously approved modifications will introduce no adverse e ffect upon the airworthiness of that aircraft.

This approval is for a single radio altimeter system with dual indicators or a dual radio altimeter system each with an MDA light located on the horizon indicator. The installation has been shown to be free of radio interference. Comp atibility has been confirmed. The limitations on flight operations are included in the approved Supplementary Airplane Flight Manual revision of November 4, 1965. 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.

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: September 10, 1965

Date of issuance: November 4, 1965

Date reissued: November 30, 2011

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

NOTE:

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## Every issue (1)

- November 30, 2011: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/fd/84/fd84d9f6da2eb1be20f06cbf26a9d77408b9364168e6f45dd3cbb4a9988f9867)

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