# TCDS TC 173: Textron Lycoming AVCO Corporation

- Type: Type certificate data sheet
- Status: Current
- Holder: Textron Lycoming AVCO Corporation
- Revision: 0
- Revised: November 2, 1950
- Product: Engine
- Data sheet PDF: https://openairdocs.org/files/sha256/b5/36/b5368d287bb0236a898b1407c282109e293fa4cd5fc7bb77a075a88fa591557b
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/B9F11D368CFF1E9C8525670E004EB782.0001
- Page: https://openairdocs.org/tcds/TC%20173

## Models (1)

As the data sheet lists them.

- R-680-D6

## What the data sheet says

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

```text
MCLEIS: Avco Lycoming R-680-D6
NUMBER: T.C. 173
Model  R-680-D6
Type  9RA
Fating:
Maximum continuous,
at S..I.
Fress.  alt.  225-2100-S.L.
Take-off  (cne minute),
be, Ipm.  at  full
thrcttle  245-2300
Fuel  (minimum octane
aviation gasoline)  65
Fore and stroke, in.  4.625 × 4.5
Displacement, cu. in.  680-4
Compression ratio  5.5:1
keight (dry),  1bS.  516
Frogeller shaft,
SAE NO.  20
Carturetion  Stromterg NA-R7A carburetor with 2 inch venturi
Ignition.  dual  Scintilla SC-A2 magneto
Certification  Casis  Type Certificate No. 173 (See NOTE 3)
NOIE 1.  Eligible with constant speed propeller drive with increase in weight of 2 1bs.
NOIE 2.  Maximum permissible cylinder head, barrel and oil inlet temperatures, 525 degrees F.. 300 degrees F., ard
200 degrees F.. respectively.
NOTE 3.  Approval expired 11/2/50.  No engines manufactured after 12/15/40 or with serial number above 1475
eligible for use in certificated aircraft.
```

## ADs (5, in force first)

- [AD 2012-03-07](https://openairdocs.org/ad/2012-03-07): Carburetor · Lycoming Engines GO-435, GO-435-C2 (O-435-17), GO-435-C2A and 389 more. Effective Mar 27, 2012
- [AD 2004-10-14](https://openairdocs.org/ad/2004-10-14): Crankshaft gear · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 642 more. Effective Jun 25, 2004
- [AD 95-26-02](https://openairdocs.org/ad/95-26-02): Aviation Gasoline · Lycoming Engines IO-320-B1A, IO-320-B1B, IO-320-B1C and 182 more. Effective Jan 24, 1996
- [AD 90-04-06 R1](https://openairdocs.org/ad/90-04-06-R1): Propeller Governor External Oil Line · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 427 more. Effective May 28, 1991
- [AD 66-06-03](https://openairdocs.org/ad/66-06-03): Connecting Rod Assemblies · Lycoming Engines GO-435-C2 (O-435-17), GO-435-C2A, GO-435-C2A2 and 317 more. Effective Jan 16, 1969

## Registered aircraft by registry model (OpenAirDocs)

- [Lycoming R-680-D6](https://openairdocs.org/engine/lycoming-r-680-d6): 0 aircraft (registry code 42377)

## 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 SA291SW](https://openairdocs.org/stc/SA291SW): Revised cover plates.. Aircraft Parts

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