# STC SA7440SW

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Ontic Engineering and Manufacturing Inc., United States
- Description: Installation of fuel quantity indicators, fuel quantity repeaters and digital calibration units.
- Applied: October 27, 1987
- Status date: March 21, 2014
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A6WE](https://openairdocs.org/tcds/A6WE)
- Certificate PDF: https://openairdocs.org/files/sha256/cd/a6/cda6f49c3c44452c406759872442aac21fe26b58397ce3f170ecdb6ad1471070
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/B493191C951D9E9C86257D88005DCD2E.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA7440SW

## ADs that name it (0)

None.

## Approved models (10)

- The Boeing Company DC-9-11 ([TCDS A6WE](https://openairdocs.org/tcds/A6WE))
- The Boeing Company DC-9-12 ([TCDS A6WE](https://openairdocs.org/tcds/A6WE))
- The Boeing Company DC-9-13 ([TCDS A6WE](https://openairdocs.org/tcds/A6WE))
- The Boeing Company DC-9-14 ([TCDS A6WE](https://openairdocs.org/tcds/A6WE))
- The Boeing Company DC-9-15 ([TCDS A6WE](https://openairdocs.org/tcds/A6WE))
- The Boeing Company DC-9-31 ([TCDS A6WE](https://openairdocs.org/tcds/A6WE))
- The Boeing Company DC-9-32 ([TCDS A6WE](https://openairdocs.org/tcds/A6WE))
- The Boeing Company DC-9-32F ([TCDS A6WE](https://openairdocs.org/tcds/A6WE))
- The Boeing Company DC-9-33F ([TCDS A6WE](https://openairdocs.org/tcds/A6WE))
- The Boeing Company DC-9-51 ([TCDS A6WE](https://openairdocs.org/tcds/A6WE))

## 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 4b of the Civil Air Regulations.

Description of Type Design Change: Installation of fuel quantity indicators, fuel quantity repeaters, and digital calibration units in accordance with Smith’s Industries Aerospace and Defense Systems, Inc., top level drawing No.

0035-ED, Rev. A, dated 4/20/88 or later FAA approved rev.

Limitations and Conditions: FAA approved airplane flight manual supplement dated August 16, 1988, is required to be carried in the modified airplane. The installer must determine whether this design change is compatible with previously approved modifications. 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.

Ontic Engineering and Manufacturing 20400 Plummer Street Chatsworth, CA 91311 A6WE Make : McDonnell Douglas Model : DC-9; -11; -12; -13; -14; -15; -31; -32; -32F; -33F; -51

Date of application: October 27, 1987

Date of issuance: August 16, 1988 Date reissued: February 03, 2012; March 21, 2014

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

(Title)

## Every issue (2)

- March 21, 2014: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/cd/a6/cda6f49c3c44452c406759872442aac21fe26b58397ce3f170ecdb6ad1471070)
- February 3, 2012: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/57/61/5761595ab6b22880e74aa2a732b2dbb788cc8807335d6294467575efe23d4b0a)

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