# STC SA00291BO

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Aerodyme Corp, United States
- Description: Installation of a Lycoming IO-390-A1A6 engine and MT-Propeller MTV-12-B/188-59b propeller.
- Applied: December 11, 2008
- Status date: November 12, 2009
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21, Part 23
- Data sheets: [TCDS A12SO](https://openairdocs.org/tcds/A12SO)
- Certificate PDF: https://openairdocs.org/files/sha256/02/b9/02b9804d40594441948d8b8967131b76fe9014084a749a720ede5c5e45234af2
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/2D1F485A3FBB56BF8625767F007BD566.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA00291BO

## ADs that name it (0)

None.

## Approved models (2)

- Commander Aircraft Company 112 ([TCDS A12SO](https://openairdocs.org/tcds/A12SO))
- Commander Aircraft Company 112B ([TCDS A12SO](https://openairdocs.org/tcds/A12SO))

## 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.

274 Valley Road South Burlington, VT 05403

Part 23 of the Federal Aviation Regulations.

Original Product Type Certificate Number: A12SO Make: Commander Model: 112, 112B Description of Type Design Change:

Installation of a Lycoming IO-390-A1A6 engine and MT-Propeller MTV-12-B/188-59b propeller in accordance with Aerodyme Corp. Model 112 210HP Engine Installation Instructions, dated August 6, 2009.

1. Descriptive data pertaining to this modification is considered inadequate for duplication in other aircraft. This approval is limited to the installation made in Commander Model 112, Serial Number 410. This STC does not permit manufacturing of parts for multiple installations.

2. This modification is to be maintained in accordance with Aerodyme 112/B/TC/TCA IO-390-A1A6 Engine Conversion Instructions for Continued Airworthiness, dated June 22, 2009.

Date of application : December 11, 2008

Date of issuance : November 12, 2009

( Signature) Robert G. Mann Manager Boston Aircraft Certification Office

( Title)

FAA Form 8110-2-1(10-69) Page

Number SA00291BO

Certification Basis :

The certification basis for this STC as shown on TDCS A12SO is:

FAR 23, effective February 1, 1965, including Amendments 1 thru 7. FAR 36, effective February 3, 1975, Models 112B, 112TC, 112TCA, 114, 114A, 114B and 114TC.

And regulations at the following amendment level:

21.93(b), amdt. 81, 23.29, amdt. 21, 23.33, amdt. 50, 23.53, 23.65, 23.71, 23.77,. 143, amdt. 50, 23.201, 23.203, .207, amdt. 50, 23.251, 23.361, amdt. 45, 23.363, 23.471, 23.603, .605 amdt. 23, 23.611, 23.613, amdt. 45, 23.623, 23.865,

23.901, amdt. 53, 23.903, amdt. 54, 23.907, amdt. 51, 23.925, amdt. 48, 23.955, .1047, .1091, .1093, amdt. 51,

23.1101, .1103, amdt. 43, 23.1105, .1107, amdt. 51, 23.1303, amdt. 49, 23.1305, amdt. 52, 23.1323, amdt. 49, 23.1521, amdt. 50, 23.1541, amdt. 21, 23.1543, amdt. 50, 23.1549, .1557, amdt. 45, 23.1581, .1583 amdt. 50.

This STC amends TCDS A12SO as follows:

Engine Lycoming IO-390-A1A6 Propeller and MT Constant Speed, Model MTV-12-B Propeller limits Blade 188-59b (small letter designates modi fications that do not affect interchangeability of blade sets) Pitch: High 30 ˚ ± 1˚, Low 11.5˚ ± 0.2˚ at Reference Radius 27.75” Diameter: Not over 74”, no reduction allowed.

Governor: P-860-4 Spinner: P-1005-3 Limitations: None

## Every issue (1)

- November 12, 2009: Issued, Current. [certificate](https://openairdocs.org/files/sha256/02/b9/02b9804d40594441948d8b8967131b76fe9014084a749a720ede5c5e45234af2)

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