# STC SA01751CH

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Hartzell Engine Technologies, LLC, United States
- Description: Installation of C&D Associates auxiliary rear combustion heater Model CD35K heater kit, P/N CD12031K9
- Applied: January 7, 2002
- Status date: February 11, 2016
- Product: Aircraft, Small Airplane
- Certification basis: Part 3, Part 21
- Data sheets: [TCDS A20SO](https://openairdocs.org/tcds/A20SO)
- Certificate PDF: https://openairdocs.org/files/sha256/d3/83/d383982f47f9c6f2f79a7e34f16650e6f9ce93e1df9e8dee1de77eba7a67712b
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/7B8A480CDA40BB4086257FAB0061BA79.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA01751CH

## ADs that name it (0)

None.

## Approved models (4)

- Piper Aircraft Inc. PA-31 ([TCDS A20SO](https://openairdocs.org/tcds/A20SO))
- Piper Aircraft Inc. PA-31-300 ([TCDS A20SO](https://openairdocs.org/tcds/A20SO))
- Piper Aircraft Inc. PA-31-325 ([TCDS A20SO](https://openairdocs.org/tcds/A20SO))
- 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.

Part 3 of the Civil Air Regulations. See Type Certificate Data Sheet No A20SO for complete certification basis.

Installation of C&D Associates auxiliary rear combustion heater Model CD35K heater kit, P/N CD12031K9 in accordance with Drawing CD12031K9, Rev. -, dated October 19, 2001, and Installation Instructions IN12031K9, Rev. A, dated November 22, 2001, or later FAA approved revisions.

1. Compatibility of this design change with previously approved modifications must be determined by the installer.

2. Check aircraft Weight and Balance.

3. A copy of this certificate must be maintained as part of the permanent records for the modified aircraft.

4. 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.

Hartzell Engine Technologies LLC 2900 Selma Highway Montgomery, Alabama 36108 A20SO Make : Piper Model : PA-31, PA-31-300, PA-31-325, PA-31-350

Date of application : January 7, 2002

Date of issuance : January 2, 2003

Date reissued : February 11, 2016

(Signature) Timothy Smyth Manager, Chicago Aircraft Certification Office

(Title)

FAA FORM 8110-2-1(10-69) PAGE 2 of 2 PAGES

Transfer the ownership of Supplemental Type Certificate Number

to (Name of transferee)

(Address of transferee)

from (Name of grantor) (Print or type)

(Address of grantor)

Signature of grantor (In ink):

## Every issue (1)

- February 11, 2016: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/d3/83/d383982f47f9c6f2f79a7e34f16650e6f9ce93e1df9e8dee1de77eba7a67712b)

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