# STC SA1669NM

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: William C. Warren, United States
- Description: Installation of a PRatt and Whitney R-985-14B engine; a Hamilton Standard 2D30/6101-12 propeller; upper and lower ailerons; Serv-Aero typye oil system with flop tube; a 6 gallon fuselage header fuel tank with flop tube; and a smoke tank system
- Applied: May 17, 1982
- Status date: July 2, 1982
- Product: Aircraft, Small Airplane
- Certification basis: Part 21
- Data sheets: [TCDS A-743](https://openairdocs.org/tcds/A-743)
- Certificate PDF: https://openairdocs.org/files/sha256/53/bd/53bdd396684373aae44b090c36d06a3b6d1b5d534eda2df181afc4dff7116b78
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/86E258987B1E552A862579FB004C1A96.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA1669NM

## ADs that name it (0)

None.

## Approved models (1)

- Boeing Airplane Company, Wichita Division A75N1 (Army PT-17, -17A, Navy N2S-1, -4) ([TCDS A-743](https://openairdocs.org/tcds/A-743))

## 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 SA1669NM This certificate issued to: William C. Warren Part 42 s$ the CIVIL AIT Regulations:

Original Product - Type Certificate Number: A-743 Make: Boeing Model: A75-N1 Description of Type Design Change: Installation of a Pratt and Whitney R-985-141 engine; a Hamilton Standard 2D30/6101-12 propeller; upper and lower ailerons:

Serv-Aero type oil system with flop tube; a 6 gallon fuselage header fuel tank with flop tube; and a smoke tank system; all in accordance with William C. warren photographs 2 through 5 and electrical schematic.

Limilationaandbinditiona: Data pertaining to this modification are considered inadequate for duplication in other aircraft. This approval is limited to the installation in Boeing, Model A75-N1, Serial Number 75-2502 only. A copy of this Certificate and Addendum must be maintained as part of the permanent records for the modified aircraft.

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) July 2, 1982 Number: SA1669NM Supplemental Type Certificate ADDENDUM NO. SA1669NM The conditions and limitations of Type Certificate Data Sheet Number A-743 apply except where superseded by the following:

Supplemental Type Certificate Addendum, which is part of STC SA1669NM, prescribes the conditions and limitations under which the product for which the STC was issued meets the airworthiness requirements of the Civil/Federal Regulations:

Supplemental Type Certificate HOLDER: William C. Warren BOEING MODEL A75N1, 2PO-CLB, Dual Category, Standard and Restricted.

(Restricted Category applicable only during air show configuration.)

Engine: Pratt and Whitney R985-14B Engine Limits: 450 hp @ 2300 RPM @ 36.5 IN Hg for 5 min.

400 hp 2 2200 RPM € 34.5 IN Hg max cont.

Fuel: 80/87 min grade aviation gasoline Propeller: Hamilton Standard 2D30/6101-12 Propeller Limits: 550 hp @2300 RPM Placards: Place placards in full view of the pilot to read:

Inverted Flight Restricted to 30 Seconds For Acrobatic Flight: Min Fuel 36 Gals Min Oil 8 Gals

- END

• FORM B110-2-1 (10-69) PAGE 3 OF 3 PAGES C FAA AC 73-2651

## Every issue (1)

- July 2, 1982: Issued, Current. [certificate](https://openairdocs.org/files/sha256/53/bd/53bdd396684373aae44b090c36d06a3b6d1b5d534eda2df181afc4dff7116b78)

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