# STC SP161NW

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Pacific Propeller International LLC, United States
- Description: Installation of rear spider seal in lieu of Hamilton Standard seal per FAA sealed Pacific Propeller, Inc. Drawing List No. 7500, dated February 24, 1975, or later FAA sealed 
revision thereto.
- Applied: January 14, 1975
- Status date: March 25, 2004
- Product: Propeller
- Certification basis: Part 21, Part 35
- Data sheets: [TCDS P-719](https://openairdocs.org/tcds/P-719)
- Certificate PDF: https://openairdocs.org/files/sha256/45/44/4544753e4c453d551b50df486b8e3e5643ea5267f24bb23a03f31285f28dc20b
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/1CA451A59664ACB986256E7B00658175.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SP161NW

## ADs that name it (0)

None.

## Approved models (1)

- Hamilton Standard Division 23D ([TCDS P-719](https://openairdocs.org/tcds/P-719))

## 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.

Number SP161NW This certificate, issued to: Pacific Propeller International LLC 5802 South 228th Street Kent, WA 98032-1810 Part 35 of theFederal Aviation Regulations, dated January 1, 1973.

Original ProductType Certificate Number: P-719-8 Make: Hamilton Standard Model: 23D40

Description of the Type Design Change: Installation of rear spider seal in lieu of Hamilton Standard seal per FAA sealed Pacific Propeller, Inc. Drawing List No. 7500, dated February 24, 1975, or later FAA sealed revision thereto.

Limitations and Conditions: Limited to installations of Hamilton Standard 23D40 hubs on Wright R-1300-1B engines. This approval should not be extended to other propellers of this model on which other previously approved modifications are incorporated unless it is determined that the interrelationship between this change and any of those other previously approved modifications will introduce no adverse effect upon the airworthiness of that propeller.

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.

Date of application: January 14, 1975 Date reissued: March 25, 2004 Date of issuance: February 28, 1975 Date amended: March 25, 2004

(Signature) Acting Manager, Seattle Aircraft Certification Office (Title)

**FAA FORM 8110-2(10-68**

## Every issue (1)

- March 25, 2004: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/45/44/4544753e4c453d551b50df486b8e3e5643ea5267f24bb23a03f31285f28dc20b)

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