# STC SA305SO

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: TALCO Aviation, United States
- Description: Installation  of  Lycoming  IO-540-C2C engines, 31A10 Rajay turbochargers, and modified fuel system
- Applied: December 20, 1963
- Status date: August 31, 2023
- Product: Aircraft, Small Airplane
- Data sheets: [TCDS A2EA](https://openairdocs.org/tcds/A2EA)
- Certificate PDF: https://openairdocs.org/files/sha256/59/1b/591b44396d67fb4bbfadf3c91bf4f986b2e4ce0d1022c6dd827f7d1b3b5e9a17
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID133110777820231130181928.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA305SO

## ADs that name it (2)

- [AD 2002-19-03](https://openairdocs.org/ad/2002-19-03): Crankshaft · Lycoming Engines IO-540-A1A5, IO-540-AA1A5, IO-540-AA1B5 and 81 more. Effective Sep 20, 2002. Named in the applicability
- [AD 65-02-03](https://openairdocs.org/ad/65-02-03): Turbochargers · Rajay Turbochargers with STC SA529WE or 6 others. Named in the applicability

## Approved models (1)

- Helio Aircraft LLC 500 ([TCDS A2EA](https://openairdocs.org/tcds/A2EA))

## 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.

SA305SO TALCO Aviation 3015 E. New York St, STE A2-270 Aurora, IL 60504 * * A2EA Helio 500 Installation of Lycoming IO-540-C2C engines, 31A10 Rajay turbochargers, and modified fuel system per Riley Aeronautics Corporation FAA approved Drawing List R0002. Aircraft Flight Manual Supplement dated July 27, 1964 revised August 6, 1964, for this conversion is required.

(See continuation sheet 3 of 3) December 20, 1963 January 14, 1969; February 10, 1982; October 30, 1987; September 22, 1995;

April 1, 2004; April 26, 2005; July 3, 2006; March 16, 2007; March 5, 2018; February 2, 2021;

August 31, 2023 July 27, 1964 August 6, 1964; September 22, 1964 for Paul (Vu) Nguyen Manager, Central Certification Branch Compliance & Airworthiness Division Aircraft Certification Service 3

SA305SO 3

SA305SO Date of Issuance: July 27, 1964 Date Amended: September 22, 1964 Date of Reissuance: August 31, 2023

*Part 3 of the Civil Air Regulations dated May 15, 1956 plus amendments 3-1 through

The approval of this change in type design applies basically to Model 500 aircraft only.

The installer must determine whether this design change is compatible with previously approved modifications. If the holder agrees to permit another person to use this certificate to alter a product, the holder must give the other person written evidence of that permission. This determination should include consideration of significant changes in weight distribution such as an increase in the fixed disposable weight in the fuselage.

-END- 3 3

## Every issue (5)

- August 31, 2023: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/59/1b/591b44396d67fb4bbfadf3c91bf4f986b2e4ce0d1022c6dd827f7d1b3b5e9a17)
- February 2, 2021: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/21/be/21be41377a7da599dcf22b8b114109e2d9d2b876b5575ca40d12c05a548d2717)
- March 5, 2018: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/12/76/12769aae99808e413f5a39388863a732494b97d00825e9f99265c1996ecec44f)
- July 3, 2006: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/52/79/5279dc7bc1fb6389e8977d16a418f9de4208c135df3971515295fe0cd8ef710e)
- April 1, 2004: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/3d/5b/3d5b59b4f05a0e186b1f6ce34329eedfa3e7e9e5b265aaca881118669b0fe259)

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