# TCDS ATC 50: Menasco Manufacturing Co.

- Type: Type certificate data sheet
- Status: Current
- Holder: Menasco Manufacturing Co.
- Revision: 0
- Product: Engine
- Data sheet PDF: https://openairdocs.org/files/sha256/4d/a5/4da5713283c1fe0f206b3029f3f7401e3ab8f1ab5ff15b33cc3051becc3b8bbe
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/680A227B649343148525670C006FEABA.0001
- Page: https://openairdocs.org/tcds/ATC%2050

## Models (1)

As the data sheet lists them.

- Pirate A-4

## What the data sheet says

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

```text
MENASCO MANUFACTURING COMPANY
MODELS:  Menasco Pirate A-4
T.C. NUMBER:  ATC 50
Model Pirate A-4
Type 4LAI
Rating:
   Maximum continuous, hp,
   rpm, at S.L. pressure altitude 90-1925-S.L.
   Take-off (one minute), hp
   rpm, at full throttle 90-1925
Fuel (minimum octane
   aviation gasoline) 70
Bore and stroke, in. 4.500 x 5.125
Displacement, cu. in. 326
Compression ratio 5.5: 1
Weight (dry), lbs. 265
Crankshaft gearing Direct drive
Supercharging
   (impeller gear ratio) None
Carburetion Stromberg NA-R3 carburetor with 1-5/16 in. venturi
Ignition, dual Scintilla PN-4DF magnetos
Certification basis Approved Type Certificate No. 50
NOTE 1.    Approval expired 10/7/41.  No engines of this model manufactured after this date or
   with serial numbers above 105 eligible for use in certificated aircraft.
```

## ADs

None name its models.

## Registered aircraft by registry model (OpenAirDocs)

- [Menasco PIRATE A-4](https://openairdocs.org/engine/menasco-pirate-a-4): 0 aircraft (registry code 43521)

## 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

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