# TCDS TC 85: 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/sha256/6f/d9/6fd999130862529c24e84ff3b4fbd0b24a94d3e754c523fa081950af3877a30c
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/8DACDDFBA584E7248525670D005E1BF7.0001
- Page: https://openairdocs.org/tcds/TC%2085

## Models (3)

As the data sheet lists them.

- Wasp Jr. TB
- Wasp Jr. TB-2
- Wasp Jr. T3A

## What the data sheet says

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

```text
MCDELS: Pratt & Whitney Wasp Jr. IB, IB-2, ІЗА
I.C. NUMBER: T.C. 85
Models - wasp Jr.  TB and T3A  182
9RA  Direct drive
Fating:
Maximum continuous,
hf. Ifm, at S.I.
Fressure altitude  420-2200-S.I.
Take-off (one minute).
op. rpm, at full
thrcttle  440-2300
Fuel (minimum octane
aviation gasoline)  3-3/16 × 5-3/16
Eore and stroke, in-
Lisplacement,  cu. in.  985
Compression ratio  6: 1
weight (dry), its.  640  653
Fropeller shaft,
SAE NO.
supercharging
(impeller gear ratio)
Stromberg NAR-9A or NAR-9B
carburetor with 2-5/8 in.  - -
Scintilla VAG-9D, VAG-9DR or
SER magnetos
NOTES  1, 2,3
Type Certificate No. 85
NOIE 1. Model IB-2 provides means for automatic valve gear lubrication and feathering propeller.
NOTE 2d Maxieur permi, ible cylinder head, barrel, and oil inlet temperature 550 degrees F., 335 degrees?..
NOTE umbers aval ipe eligible for use in certif theed airera manufactured after this date or with serial
```

## ADs (7, in force first)

- [AD 78-08-07](https://openairdocs.org/ad/78-08-07): Cylinder Head Separation · Pratt & Whitney Division Military R-985 Series, Wasp Jr. A, Wasp Jr. B-4 and 10 more. Effective May 2, 1978
- [AD 68-09-01](https://openairdocs.org/ad/68-09-01): Crankshaft Flyweight Liners · Pratt & Whitney Division Military R-985 Series, Wasp Jr. A, Wasp Jr. B-4 and 10 more. Effective Jan 17, 1973
- [AD 70-10-02](https://openairdocs.org/ad/70-10-02): Gerotor Pump Drive Pin/Fuel Injector Filter · Pratt & Whitney R-985 engine and ATI fuel injection (Staggerwing Museum Foundation STC SE1-391). Effective Jun 9, 1970
- [AD 66-14-04](https://openairdocs.org/ad/66-14-04): Cam Reduction Drive Gear Assembly · Pratt & Whitney Division Military R-985 Series, Wasp Jr. A, Wasp Jr. B-4 and 10 more. Effective Jul 9, 1966
- [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
- [AD 57-05-04](https://openairdocs.org/ad/57-05-04): Crankshaft · Pratt & Whitney Division Military R-985 Series, Wasp Jr. A, Wasp Jr. B-4 and 10 more
- [AD 56-26-03](https://openairdocs.org/ad/56-26-03) (historical): Crankshaft · Pratt & Whitney Division Military R-985 Series, Wasp Jr. A, Wasp Jr. B-4 and 10 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

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.