# STC SA3498NM

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Ontic Engineering and Manufacturing Inc., United States
- Description: Installation of Smith Aerospace fuel quantity gauge system
- Applied: September 29, 1987
- Status date: November 5, 2013
- Product: Aircraft, Large Airplane
- Certification basis: Part 21, Part 25
- Data sheets: [TCDS A16WE](https://openairdocs.org/tcds/A16WE)
- Certificate PDF: https://openairdocs.org/files/sha256/ec/5f/ec5f39dcb3c906110c532cacdf541204b078dfad15d7dedb39297b363ac03d7c
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/1FF0CBF4A279CFA586257D88005D7BB6.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA3498NM

## ADs that name it (0)

None.

## Approved models (5)

- The Boeing Company 737-100 Series ([TCDS A16WE](https://openairdocs.org/tcds/A16WE))
- The Boeing Company 737-200 Series ([TCDS A16WE](https://openairdocs.org/tcds/A16WE))
- The Boeing Company 737-300 Series ([TCDS A16WE](https://openairdocs.org/tcds/A16WE))
- The Boeing Company 737-400 Series ([TCDS A16WE](https://openairdocs.org/tcds/A16WE))
- The Boeing Company 737-500 Series ([TCDS A16WE](https://openairdocs.org/tcds/A16WE))

## 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 the Type Design Change:

Installation of Smith Aerospace fuel quantity gauge system in Boeing 737 aircraft as presented on Page 2 of this document.

1. FAA approved Aircraft Flight manual Supplemental as presented on Page 2 of this document.

2. Instructions for Continued Airworthiness, Chapter 28, Fuel, Document Number O191-ED Rev B dated November 20, 2003, is required for modification on Boeing 100/200/300/400/500 that includes the Smith Industries Transient Suppression Unit (TSU) (ONLY for 0027-ED, Rev K Configurations 6 through 17 and 0043-ED Rev B Configurations 49 through 93).

3. The approval of this change in type design applies to the above listed aircraft models. This approval should not be extended to aircraft of these models that incorporate any other previously approved modifications unless it is determined that the interrelationship between this change and any other modification will introduce no adverse effect on the airworthiness of these aircraft. A copy of this STC must he included in the permanent records of the modified aircraft.

4. If the holder agrees to permit another person to use this certificate to alter a product, the holder must give the other person written evidence of that permission.

(Sec Continuation Sheet 2)

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 A16WE Make : The Boeing Company Model : 737-100, -200, -300, -400, & -500 Date reissued: January 27, 2012; November 5, 2013

Date amended: February 17, 1989; April 19, 1994;

June 10, 2004; June 18, 2007

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

Date of application: September 29, 1987

Date of issuance: December 18, 1987

Date of Amendment: June 18, 2007

Description of the Type Design Change (continued):

Aircraft Model Drawing List/ Rev./ Date* Flight Manual Supplement / Rev./ Date*

737-100/-200 0013-ED/ Rev. “P”/ dated 12/23/02 0042-ED/ Rev. “C"/ dated 7/19/02

737-300/-400/-500 0027-ED/ Rev. “L"/ dated 6/07/07 configurations - I to - 15 0030-ED/ Rev. “A"/ dated 6/07/07

737-400 (with Rogerson Aux fuel Tank and Smiths Fuel Gauging System) 0027-ED/Rev. “K”/ datcd 2/25/04, configurations -16 and - 17 0187-ED/ Rev. “A”/ dated 6/I0/04

•or later FAA approved Revision

... END ...

## Every issue (3)

- November 5, 2013: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/ec/5f/ec5f39dcb3c906110c532cacdf541204b078dfad15d7dedb39297b363ac03d7c)
- January 27, 2012: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/b1/d7/b1d757f2a3b015c978644039456e03bd3bc07e8a1f1d856db16d9e30e4f5197e)
- June 18, 2007: Amended, Historical. [certificate](https://openairdocs.org/files/sha256/6d/af/6daf8c5775a795b04fa22f177068d0bf96ac869039d8d0d2ce5f52cd29f92088)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.