# STC SA3642NM

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Frontier Flying Service Inc., United States
- Description: Installation of Hartzell HC-E3YR-2ATF/FC8468( )-8Q (left engine) and HC-E3YR-2ALTF/FJC8468( )-8Q (right engine) propeller assemblies. PA-31-350 (T-1020) and PA-31-350 (Chieftain). Serial numbers 31-7405218, 238, 485, 490; 31-7552043, 076; and 31-7652144 are ineligible for this installation.
- Applied: October 17, 1987
- Status date: February 4, 2020
- Product: Aircraft, Small Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A20SO](https://openairdocs.org/tcds/A20SO)
- Certificate PDF: https://openairdocs.org/files/sha256/c8/95/c895f4eacdc386778b4407678da4b039ae7711cc95913cfc213a63885cf2c6a0
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/93AA11F8D7DCA5FB8625852200769B5C.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA3642NM

## ADs that name it (0)

None.

## Approved models (1)

- The New Piper Aircraft Inc. PA-31-350 ([TCDS A20SO](https://openairdocs.org/tcds/A20SO))

## 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.

Installation of Hartzell HC-E3YR-2ATF/FC8468( )-8Q (Left Engine) and HC-E3YR-2ALTF/FJC8468( )-8Q (Right Engine) propeller assemblies in accordance with Cape Smythe Air Service, Inc. Installation Instructions, dated January 25, 1988, or later FAA approved revision.

FAA Approved Airplane Flight Manual Supplement, dated February 9, 1990, or later FAA approved revision is required. This approval should not be extended to other aircraft of this model on which other previously approved modifications are incorporated unless it is determined that the interrelationship between this change and any other previously approved modification will introduce no adverse effect upon the airworthiness of the airplane. Airplane serial numbers 31-7405218, 238, 485, 490; 31-7552043, 076; and 31-7652144 are ineligible for this installation

Frontier Flying Service, Inc.

4700 Old International Airport Rd Anchorage, AK 99502-1020 Date reissued: February 4, 2020

Date amended: February 26, 1988; February 9, 1990

(Signature) August A. Asay Manager, Anchorage ACO Branch

(Title) October 17, 1987 February 1, 1988

A20SO Piper PA-31-350 (T-1020) and PA-31-350 (Chieftain) * Complete certification basis is specified in Type Certificate Data Sheet Number A20SO, Revision 5

## Every issue (1)

- February 4, 2020: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/c8/95/c895f4eacdc386778b4407678da4b039ae7711cc95913cfc213a63885cf2c6a0)

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