# TCDS ATC 158: 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/sha256/88/54/88540eda307886417c49490bf7d4090072864c6df0f8fc0040ac32da39f2b938
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/777712EB07C3B46F8525670D00648D18.0001
- Page: https://openairdocs.org/tcds/ATC%20158

## Models (2)

As the data sheet lists them.

- Twin Wasp SB3-G
- Twin Wasp SB-G

## What the data sheet says

This is OCR from the scanned FAA data sheet. OCR can misread letters and numbers.

```text
MODEIS: Pratt 6 Whitney Iwin wasp SB-G and SB3-G
I.C. NUMBER: ATC 158
Model - Iwin Wasp  SB3-G
Type - 14RA  3:2 reduction gearing
Rating:
Maximum continuous,
rEm, in.Hg.. at:
Rated pressure
altitude (ft.)  900-2450-34-5-6500
s.I. pressure
altitude  860-2450-34-5-S.1.
Take-off (one minute).
hr. Ipm, in-Hg.  1000-2650-41-3
1000-2450-42-7
Fuel (mirimum octane
aviation gascline)  87
Fore and stroke, in.
Lisplacement, cu. in.
compression ratio
weight (dry).
Fropeller shaft,
(impeller gear ratio)
Stromterg NA-Y9E or NA-Y9G carburetor with 2-3/4 in. venturi
Ignition, dual  Scintilla SE-14 RN1A magnetos
Approved Type Certificate No. 158
NOTE 1. Includes model SB-G with 6.5:1 or 6.7:1 (Jone type valves) compression ratio and weight (dry) of 1235 lbs.
NOTE 2.  alove Pist eligible for use in certificated aircraft.  No engines of these models manufactured after this date or with serial numbers
```

## 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 (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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