# TCDS TC 171: Wright Aeronautical Division Curtiss-Wright Corporation

- Type: Type certificate data sheet
- Status: Current
- Holder: Wright Aeronautical Division Curtiss-Wright Corporation
- Revision: 0
- Product: Engine
- Data sheet PDF: https://openairdocs.org/files/sha256/6a/f2/6af2ccafbb21e518e3d85e0c08f2be5c25552a3df6265ab030f9d37b7dfe5358
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/40B01EEEE0ED6EC08525670E0065A28F.0001
- Page: https://openairdocs.org/tcds/TC%20171

## Models (4)

As the data sheet lists them.

- Cyclone GR-1820G-3B
- Cyclone GR-1820G-3
- Cyclone R-1820G-3B
- Cyclone R-1820G-3

## What the data sheet says

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

```text
MODEIS:  Wright Cyclone R and GR-1820G-3, -3B and Military R-1820-77
I.C. NUMBER: I.C. 171
Model - Cyclor.e  R-1820G-3.  GR-1820G-3  R-18206-3B, 6R-19206-38
Type - 9RA  Direct drive, 16:11 reduction gearing
Rating:
maximum continuous,
in. Hg..  at:
Rated pressure
altitude (ft.)  840-2100-35-0-8700  820-2100-35.3-8800
sea level pressure
altitude  760-2100-35-0-S.L.  820-2100-38.5-S.I.
Take-off (one minute),
hr. xpm.  in. Hg.  875-2200-38.5  800-2350-41.0
Fuel  (minimum octane
aviation gasoline)  87
Fore  and stroke, in.  6.125 × 6.875
Lisplacement, cu.  in.  1823
Compression ratio  6.45:1  6.2:1
Weight  (dry) .  1bs.  1103.  1198
Fropeller shaft,
SAE No.  40,50
Supercharging
(impeller gear ratio)
Carturetion  Holley C.G.  1375 C, E, F OL H.
Stromkerg NA-F7F with  2-3/8 in.
venturi,  Chandler-Evans 1375 DA-1
carburetor
Ignition, dual  SF9IN1,  Scintilla  SF9IN2,  FSIN2. S8913 OR SF9L4
magnetos
Ignition timing,
degrees BIC
NOTES  1.3
Certification basis
Froduction basis  The manufacturer does not hold a production certificate for the production of
engines under this type certificate and, therefore, each engine so produced is subject
o a detailed inspection for workmanshif and conformity with the approved data by a
Civil Aeronautics Administration Agent.  In addition, the engine must have a satis-
factory run-in including 5 hours at rated power and speed.  Upon satisfactory completion
of the above, the agent will tag the engine with Tag Form ACA 186.
NOTE 1-  Maximum permissible cylinder head, barrel, and oil inlet temperatures, 500 degrees F.. 300 degrees F..
and 200 degrees F., respectively.
NOTE 2. Eligible with original cylinder head number 65957 with the following rating:
Maxated pontine altitude (ft.)  in Hg., at:
840-2100-36-0-8700
Sea level pressure altitude  760-2100-36-0-S. L.
Take-off (one minute), hp, Ipm, in.Hg.  875-2200-39-0
NOTE 3. Eligible with torquemeter number 413516 at weight increase of 12 1bs.
Military model R-1820-77 is identical to model GR-1820G-3.  When installed in certificated aircraft, the
designation GR-1820G-3 and T.C. No.  171 should be added to the engine designation plate.
```

## ADs (1, in force first)

- [AD 94-14-10](https://openairdocs.org/ad/94-14-10): Aviation Gasoline · Wright Aeronautical Division, Curtiss-Wright Cyclone R-1820F-2A, Cyclone R-1820F-3A, Cyclone R-1820F-56 and 6 more. Effective Feb 13, 1996

## 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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