# STC SA1643CE

- Type: Supplemental type certificate
- Status: Historical, Reissued
- Holder: Helio Aircraft Association Inc, United States
- Description: Installation of Lycoming IO-540-K1B5 or IO-540-K1H5 engine.
- Applied: October 1, 1979
- Status date: October 18, 2012
- Product: Aircraft, Single-Engine
- Certification basis: Part 3, Part 21
- Data sheets: [TCDS 1A8](https://openairdocs.org/tcds/1A8)
- Certificate PDF: https://openairdocs.org/files/sha256/6a/95/6a95c0b0dcda8d8f6d8e5a660e978670f3145e22af6f9f0247ba574a5c9bb3a8
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/BB4F4B8B3910537586257AB6005BFD99.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA1643CE

## ADs that name it (0)

None.

## Approved models (2)

- Alliance Aircraft Group LLC H-250 ([TCDS 1A8](https://openairdocs.org/tcds/1A8))
- Helio Aircraft LLC H-250 ([TCDS 1A8](https://openairdocs.org/tcds/1A8))

## 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.

This certificate issued to: Helio Aircraft Association, Inc.

1500 E. Highland Road Waxahachie, TX 75167

Part 3 of the Civil Air Regulations.

Original Product - Type Certificate Number : 1A8 Make : Helio Model : H-250 Description of Type Design Change:

Installation of Lycoming IO-540-K1B5 or IO-540-K1H5 engine in place of Lycoming O-540-A1A5. Data Required: (1) Clarence H. Brent Report B-300-250 “Installation Instructions for Brent Modification Kit B- 300-250” Revision C dated April 2, 1981, or later FAA approved revision; and (2) Airplane Flight Manual Supplement dated April 1, 1981, or later FAA approved revision.

1) This approval should not be extended to other specific airplanes 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 airplane.

2) 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 reissued : May 31, 1983; December 5, 2006;

September 12, 2012, October 18, 2012 Date amended :

Original signed by Steve Litke

( Signature) Steven C. Litke Program Manager Wichita Aircraft Certification Office (Title) Date of application : October 1, 1979 Date of issuance : April 3, 1981

## Every issue (3)

- October 18, 2012: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/6a/95/6a95c0b0dcda8d8f6d8e5a660e978670f3145e22af6f9f0247ba574a5c9bb3a8)
- September 12, 2012: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/77/5b/775b35abda3184dbd5a74613d3172c44ff022427da49a7ec55da70c57c533f7a)
- December 5, 2006: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/a0/8c/a08c1a7d1c15498a3358d6ee6e747979bdf55e77e4341c6177a53d25b95a1214)

---
From OpenAirDocs.org, an independent open copy of FAA and NTSB data. Only the Federal Register edition on govinfo.gov is the official legal text of an AD.