# STC SA2955SO

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Ontic Engineering and Manufacturing Inc., United States
- Description: Replacement of existing electromechanical fuel quantity indicators with Smiths Industries digital fuel quantity indicators
- Applied: July 23, 1990
- Status date: February 14, 2014
- Product: Aircraft, Large Airplane
- Certification basis: Part 21, Part 25
- Data sheets: [TCDS A22WE](https://openairdocs.org/tcds/A22WE)
- Certificate PDF: https://openairdocs.org/files/sha256/dd/4c/dd4c27baf3a89aecb47b0997ab453ea86df7d3b79930e861c25ca4cf61d214a0
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/7A4AD90A020AF0DE86257D88005EDDA7.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA2955SO

## ADs that name it (0)

None.

## Approved models (3)

- The Boeing Company DC-10-10 ([TCDS A22WE](https://openairdocs.org/tcds/A22WE))
- The Boeing Company DC-10-30 ([TCDS A22WE](https://openairdocs.org/tcds/A22WE))
- The Boeing Company DC-10-40 ([TCDS A22WE](https://openairdocs.org/tcds/A22WE))

## 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

Part 25 of the Federal Aviation Regulations.

Description of Type Design Change: Replacement of existing electromechanical fuel quantity indicators with Smiths Industries digital fuel quantity indicators in accordance with Smiths Industries drawing number 0066-ED Revision G dated October 24, 1995, or later FAA Approved revision.

Limitations and Conditions: This approval should not be extended 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 produce no adverse effect upon the Airworthiness of that airplane. FAA Approved Airplane Flight manual Supplement, dated 5/22/91, is a required part of this STC.

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.

Ontic Engineering and Manufacturing 20400 Plummer Street Chatsworth, CA 91311 A22WE Make : McDonnell Douglas Model : DC-10-10-10, -30, -30ER, -40

Date of application: July 23, 1990

Date of issuance: November 14, 1995 Date reissued: March 04, 2008; February 14, 2014

Date amended: May 31, 1996

(Signature) Steven L. Lardinois Manager, Systems and Flight Test Branch Chicago Aircraft Certification Office

(Title)

## Every issue (2)

- February 14, 2014: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/dd/4c/dd4c27baf3a89aecb47b0997ab453ea86df7d3b79930e861c25ca4cf61d214a0)
- March 4, 2008: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/8c/58/8c588c81eede9f123fb956cdb51175065443c39444b8e4843f52d3b964cbf20a)

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