# STC SA01538AT

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Whelen Aerospace Technologies, United States
- Description: Installation of Hartzell HC-C3YR-1RF/F7590 or HC-C2YK-1A or HC-C2YK-1B propellers.
- Applied: March 21, 1995
- Status date: July 22, 2022
- Product: Aircraft, Small Airplane
- Certification basis: Part 3, Part 21
- Data sheets: [TCDS 1A15](https://openairdocs.org/tcds/1A15)
- Certificate PDF: https://openairdocs.org/files/sha256/01/a1/01a18e156020dfdf453958778aa7090fb79afcac8ce48c9a8261ba453a666c99
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/536D107F0CE58A54862588C3005D1BE6.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA01538AT

## ADs that name it (0)

None.

## Approved models (1)

- The New Piper Aircraft Inc. PA-24-250 ([TCDS 1A15](https://openairdocs.org/tcds/1A15))

## 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.

Title: (for) Christina M. Underwood Manager, Atlanta ACO Branch Compliance and Airworthiness Division Aircraft Certification Service SA01538AT Whelen Aerospace Technologies 51 Winthrop Road Chester , CT 06412 Part 3 Civil Air Regulations 1A15 Piper PA-24-250 Installation of Hartzell HC-C3YR-1RF/F7590 or HC-C2YK-1A or HC-C2YK-1B propellers as documented in the LoPresti Speed Merchants "Comanche 250 Propelloer Conversion Installation Innstructions" Report No. 007, Rev IR, August 12, 1997 or later FAA Approved Reviosions and one of the modified Lycoming engines per STC SE01537AT.

The installer must determine whether this design change is compatible with previously approved modifications. LoPresti Speed Merchants "FAA Approved Flight Manual Supplemen for Comanche 250 Propeller Conversion (Report No. 006)" Rev IR dated December 31, 1997 is required. If the holder agrees to permit a person to use this certificate to alter a product, the holder must (See Continuation Shhet 3) March 21, 1995 January 16, 2019; July 22, 2022 December 31, 1997 3

SA01538AT 3

SA01538AT Limitations and Conditions (Cont.)

give this person the other person written evidence of that permission.

## Every issue (2)

- July 22, 2022: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/01/a1/01a18e156020dfdf453958778aa7090fb79afcac8ce48c9a8261ba453a666c99)
- January 16, 2019: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/c1/95/c1957a639633a40ce59e26e21c683ea4fe742399ebd1e708336ba1128d476366)

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