# STC SA4139NM

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Miltner Harry, United States
- Description: Installation of a Continental O-200-A engine, Cessna 150 baffle system, univair type F19 engine mount, Cessna 150 engine exhaust stack assembly, two 6 gallon wing fuel tanks and associated systems, 60 AMP alternator (Cessna 150 type) and a Hendrickson Model H70A48 wood propeller
- Applied: April 20, 1982
- Status date: February 24, 1988
- Product: Aircraft, Small Airplane
- Certification basis: Part 21
- Data sheets: [TCDS A-696](https://openairdocs.org/tcds/A-696)
- Certificate PDF: https://openairdocs.org/files/sha256/f9/8a/f98ad839df14760cbb895e0d6d731e91ae03c1dab33800628a67fcda8c7045b9
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/9D83D647973ACB7186257A250062DE55.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA4139NM

## ADs that name it (0)

None.

## Approved models (1)

- Taylorcraft 2000 LLC BC12-D ([TCDS A-696](https://openairdocs.org/tcds/A-696))

## 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 Supplemental Type Certificate Number 5A4139N1 This certificate issued to: Harry P. Miltner 1512 Skyline Drive Ellensburg, Washington 98926 Purt 04 f the CIVIL Air Regulations. Dated May 1, 1938 Original Product -TypeCertificate Lumben: A=596 Make: Taylorcraft Model: BC12-D escriplin f Sype Lesign Change:

Installation of a Continental 0-200-A engine, Cessna 150 baffle system, univair type F19 engine mount, Cessna 150 engine exhaust stack assembly, two 6 gallon wing fuel tanks and associated systems, 60 AMP alternator (Cessna 150 type) and a Hendrickson Model H70A48 wood propeller in accordance with Harry P. Miltner Figures (1) through Limitations and Conditions:

Data pertaining to this modification are considered inadequate for duplication in other aircraft. This approval is limited to the installation in Taylorcraft BC12-D, Serial No. 6913 only. A copy of this Certificate and Addendum No. SA4139NM shall be maintained as part of the permanent records for the modified aircraft.

SA4139NM The conditions and limitations of Type Certificate Data Sheet No. A-696 apply except where superseded by the following:

Supplemental Type Certificate Addendum, which is part of STC SA4139NM, prescribes the conditions and limitations under which the product for which the STC was issued meets the airworthiness requirements of the Civil Air Regulations. A copy of this STC Addendum is required to be maintained as part of the permanent records for the modified aircraft.

Supplemental Type Certificate HOLDER: Harry P. Miltner I. MODEL BC12-D 2PCLM (NORMAL CATEGORY) AS MODIFIED BY STC SA4139NH Engine: Continental 0-200-A Fuel: 80/87 Octane Minimum Grade Aviation Gasoline Engine Limit: A11 operations 2750 RPM (100 Hp) Propeller & Propeller Limits Hendrickson H70A48 Diameter: Maximum 70" Minimum 70" Static Limits:

Maximum 2300 RPM Minimum 2200 RPM Maximum Weight: 1200 pounds Serial Nos. Eligible: 6913 only

**FAA FORM 8110-2-1 (10-69) PAGE 30F 4 PAGES**

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number 54139Nx Supplemental Type Certificate ADDENDUM NO. SA4139NM NOTE: Current weight and balance report including list of equipment in the certified empty weight must be in the aircraft.

NOTE: The following placard must be displayed adjacent to or in close proximity to the aircraft identification plate:

ENGINE INSTALLATION Continental 0-200-A PER SIC SA4139NM Make: February 24, 1988

- END -

**FAA FORM 8110-2-1 (10-69) PAGE 4 OF 4 PAGES**

## Every issue (1)

- February 24, 1988: Issued, Current. [certificate](https://openairdocs.org/files/sha256/f9/8a/f98ad839df14760cbb895e0d6d731e91ae03c1dab33800628a67fcda8c7045b9)

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