# TCDS ATC 128: Pratt & Whitney Division

- Type: Type certificate data sheet
- Status: Current
- Holder: Pratt & Whitney Division
- Revision: 0
- Product: Engine
- Data sheet PDF: https://openairdocs.org/files/sha256/ae/28/ae28de8707c7d78e86e682a85dd1a433f535cbfbd8ddd0110e9cbfedc47cc8e2
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/3A48FC13F39344828525670D005F879A.0001
- Page: https://openairdocs.org/tcds/ATC%20128

## Models (1)

As the data sheet lists them.

- Wasp S3D1

## What the data sheet says

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

```text
PRATT & WHITNEY AIRCRAFT DIVISION OF UNITED AIRCRAFT CORPORATION
MODELS:  Pratt & Whitney Wasp S3D1
T.C. NUMBER:  ATC 128
Model - Wasp S3D1
Type - 9RA Direct drive
Rating:
   Maximum continuous, hp, rpm,
   in.Hg., at:
      Rated pressure altitude (ft.) 450-2100-28  ½-6000
      S.L. pressure altitude 440-2100-29-S.L.
   Take-off (one minute),
   hp, rpm, in.Hg. 450-2100-30
450-1950-31
450-1775-33
Fuel (minimum octane aviation
   gasoline) 73
Bore and stroke, in. 5.75 x 5.75
Displacement, cu. in. 1344
Compression ratio 6: 1
Weight (dry), lbs. 730
Propeller shaft, SAE No. 30
Supercharging
   (impeller gear ratio) 10: 1
Carburetion Stromberg NA-Y8E carburetor with 2 inch venturi
Ignition, dual Scintilla VAG-9D magnetos
Certification basis Approved Type Certificate No. 128
NOTE 1.    Approval expired 1/8/36.  No engine of this model manufactured after this date or
with
   serial numbers above 5453 eligible for use in certificated aircraft.
```

## ADs (1, in force first)

- [AD 56-06-02](https://openairdocs.org/ad/56-06-02): Cylinder Flange Attaching Stud · Pratt & Whitney Division Double Wasp CA15, Double Wasp CA17, Double Wasp CA18 and 115 more

## 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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