# TCDS ATC 12: Commonwealth Aircraft Inc.

- Type: Type certificate data sheet
- Status: Current
- Holder: Commonwealth Aircraft Inc.
- Revision: 0
- Product: Engine
- Data sheet PDF: https://openairdocs.org/files/sha256/a0/c6/a0c629bebd961190c88a724bbad06f1280ac2d0dbef2a6349a81af429b4bfe2a
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/44ACBB7827BADE9C8525670B00668FDA.0001
- Page: https://openairdocs.org/tcds/ATC%2012

## Models (1)

As the data sheet lists them.

- LeBlond 60 5D

## What the data sheet says

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

```text
COMMONWEALTH AIRCRAFT, INC
MODELS:  Commonwealth LeBlond 60 5D
T.C. NUMBER:  ATC 12
Model LeBlond 60 5D
Type 5RA
Rating:
   Maximum continuous,
   hp, rpm, at S.L.
   press. alt. 65-1950-S.L.
   Take-off, hp, rpm,
   at full throttle 65-1950
Fuel (minimum octane
   aviation gasoline) 70
Bore and stroke, in. 4.125 x 3.750
Displacement, cu. in. 250.58
Compression ratio 5.42: 1
Weight (dry), lbs. 228
Crankshaft gearing Direct drive
Supercharging None
Carburetion Stromberg carburetor
Ignition, dual Scintilla magnetos
Certification basis Approved Type Certificate No. 12
NOTE 1.    Approval expired 12/1/35.  No engines of this model manufactured after this date or
   with serial numbers above 5D-805 eligible for use in certificated aircraft.
```

## ADs

None name its models.

## STCs approved under this data sheet (2)

- [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
- [STC SA4005NM](https://openairdocs.org/stc/SA4005NM): Precise Flight Inc. Pulselite Control System. Precise Flight Inc

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