# STC SA2770NM-D

- Type: Supplemental type certificate
- Status: Current, Surrendered
- Holder: United Air Lines Inc, United States
- Description: Installation of TCAS II and Mode S transponder provisions, consisting of system interwiring, antenna coaxial cables, antenna structure installation, TCAS directional antenna and transponder antenna. Approved for 727-222 model.
- Applied: April 12, 1989
- Status date: June 26, 2009
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A3WE](https://openairdocs.org/tcds/A3WE)
- Certificate PDF: https://openairdocs.org/files/sha256/47/19/47191c87e5152d6b1df4846fbb8f254437fd2d9d56e7670bc4c79534cbd933fb
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/C3414AA8735BE00C862577DC00734E1A.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA2770NM-D

## ADs that name it (0)

None.

## Approved models (1)

- The Boeing Company 727-200 Series ([TCDS A3WE](https://openairdocs.org/tcds/A3WE))

## What the certificate says

This is OCR from the scanned FAA certificate. OCR can misread letters and numbers.

United States of America Department of Transportation Federal Aviation Administration Certificate Supplemental Type Certificate SURRENDERED 6.26.2009 Number SA2770NM-D This certificate issued to: United Airlines Part 25 of the Federal Aviation Regulations: See TC Data Sheet AWE Original Product -Type Certificater Numben: АЗИЕ Make: Boeing Model: 727-222 Series Description of Type Design Change:

Installation of TCAS II and Mode 'S' Transponder provisions, consisting of system interwiring, antenna coaxial cables, antenna structure installations, ICAS directional antenna and transponder antenna, in accordance with United Airlines, DAS-1WE, approved drawing list 2770, dated February 9, 1990, or later approved revision.

This approval does not extend to other aircraft 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 that aircraft.

Date of Application: April 12, 1989 Date Reissued:

Date of Issuance: February 9, 1990 Date Amended:

FEDERAL AVIATION By divection of the seppinispaton sages ZM. (Signature )

OMINISTRA UNITED AIRLINES DAS COORDINATOR DAS-TWE (Title)

47.

## Every issue (1)

- June 26, 2009: Surrendered, Current. [certificate](https://openairdocs.org/files/sha256/47/19/47191c87e5152d6b1df4846fbb8f254437fd2d9d56e7670bc4c79534cbd933fb)

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