# TCDS ATC 70 Aviation Holding: Aviation Holding Company

- Type: Type certificate data sheet
- Status: Current
- Holder: Aviation Holding Company
- Revision: 0
- Product: Engine
- Data sheet PDF: https://openairdocs.org/files/sha256/9c/61/9c61907e82a1377a4c1d74d0ae3db7215e5d1de00d20814952f672743ecdbc30
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/5839F84AC8941B07862572C0006F831C.0001
- Page: https://openairdocs.org/tcds/ATC%2070%20Aviation%20Holding

## Models (1)

As the data sheet lists them.

- Szekely SR-3-45

## What the data sheet says

From the PDF's text layer, line by line; tables lose their columns. The PDF is the record.

```text
AVIATION HOLDING COMPANY
MODELS:  Aviation Holding Szekely SR-3-45
T.C. NUMBER:  ATC 70
Model Szekely SR-3-45
Type 3RA
Rating:
   Maximum continuous,
   hp, rpm, at S.L.
   press. alt. 45-1750-S.L.
   Take-off, hp, rpm,
   at full throttle 45-1750
Fuel (minimum octane
   aviation gasoline) 74
Bore and stroke, in. 4.125 x 4.75
Displacement, cu. in. 190.4
Compression ratio 4.9: 1
Weight (dry), lbs. 138
Carburetion Zenith 1357AL or Stromberg NA-5-3 carburetor
Ignition, dual Bosch FU6-3-BR or Splitdorf C magnetos or Splitdorf
   generator coil distributor
Certification basis Approved Type Certificate No. 70 (Expired 12/22/32.)
```

## ADs

None name its models.

## STCs approved under this data sheet (1)

- [STC SE04651CH](https://openairdocs.org/stc/SE04651CH): To allow use of l00R grade aviation fuel meeting Swift Fuel, LLC specification SPEC-l00R-22. Swift Fuels LLC

## PMA parts (OpenAirDocs) (1)

Current parts manufacturer approvals (PMA): parts the FAA has approved companies to make as replacements or modifications. Each record lists its models as free text; OpenAirDocs matched them to this data sheet's models, so check the FAA record before relying on it. Newest first.

- [No part number](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID147188949120260722204346.0001): Swift Fuels, LLC · PMA PQ04423CE · For Szekely SR-3-45 · Jul 17, 2026

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