# TCDS E-256: Textron Lycoming AVCO Corporation

- Type: Type certificate data sheet
- Status: Current
- Holder: Textron Lycoming AVCO Corporation
- Revision: 6
- Revised: April 22, 1959
- Product: Engine
- Registered aircraft: 2, by the registry models matched to it (OpenAirDocs)
- Data sheet PDF: https://openairdocs.org/files/sha256/73/d0/73d095f70f0c06fec520618ca59a9c8efbac1891d7d470275116e7f1500810db
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/AE72EC944D29698E8525670E004F39E7.0001
- Page: https://openairdocs.org/tcds/E-256

## Models (4)

As the data sheet lists them.

- GSO-580-C
- GSO-580
- GSO-580-B
- GSO-580-D

## What the data sheet says

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

```text
Page No. 1 2
Rev. No. 6 6
FEDERAL AVIATION AGENCY
E-256
Revision 6
AVCO
LYCOMING
GSO-580
GS0-580-B
GSO-580-C
GSO-580-D
April 22, 1959
AIRCRAFT ENGINE SPECIFICATION
Engines of models described herein conforming with this specification and approved data on file with the Federal Aviation
Agency meet the minimum standards for use in certificated aircraft in accordance with pertinent aircraft specifications and
applicable portions of the Civil Air Regulations provided they are installed, operated, and maintained as prescribed by the
approved manufacturer's manuals.
Manufacturer AVCO Manufacturing Corp.
Lycoming Division
Williamsport, PA
Model                    Lycoming GSO-580, GSO-580-C GSO-580-B, GSO-580-D
Type                         8HOA 77:120 -  -
Reduction Gearing
Rating
  Max. continuous, hp, rpm, in.Hg., at:
    Rated pressure altitude (ft.) 320-3000-32.0-7000 350-3000-35.2-5000
   Sea level pressure altitude (ft.) 320-3000-34.0-S.L. 350-3000-37.0-S.L.
  Takeoff (5 minutes), hp, rpm, in.Hg., at: 375-3300-39.5-S.L. 400-3300-41.5-S.L.
Fuel (Min. grade aviation gasoline) 91/98 Grade 100/130
Bore and stroke, in. 4.875 X 3.875 -  -
Displacement, cu. in. 578 -  -
Supercharging ratio 7.9:1 -  -
Compression ratio 7.30:1 -  -
Weight (dry), lbs. 619  (GSO-580) 624  (GSO-580-B)
604  (GSO-580-C) 608 (GSO-580-D)
C.G. location (dry) See NOTE 5 -  -
Propeller shaft, SAE No. 20 Spline 30 Spline
Carburetion, Bendix with PSH-9BDE (GSO-580) PSH-9BDE (GSO-580-B)
  2.5 in. venturi PS-9BDE (GSO-580-C) PS-9BDE (GSO-580-D)
Ignition, Dual Scintilla SF8LN -  -
Timing, °BTC 25 -  -
Spark plugs See Note 7 -  -
NOTES 1, 2, 3, 5, 7 1, 2, 3, 5, 7
"-  -" indicates "same as preceding model."
Certification Basis Type Certificate No. 256
Production Basis Production Certificate No. 3

E-256 2
Note 1. Maximum permissible temperature:
Cylinder Head
(Well Type) Cylinder Base Oil Inlet
475°F 325°F 225°F
NOTE 2. Min. Max.
Fuel pressure limits    9 psi 15 psi
Oil pressure limits (normal operation)   55 psi 85 psi
(idling 25 psi)
NOTE 3. The following accessory provisions are provided:
GSO-580 GSO-580-C
Direction of
Rotation
Facing
Speed X
Crank Shaft
Maximum
Torque
(in.-lb.)
Maximum
Overhang
Moment
Accessory GSO-580-B GSO-580-D Engine Pad RPM Cont. Static (in.-lb.)
Starter X X C 1.000:1 - 12000 300
Generator X C 1.184:1 200 800 350
Generator X C 2.600:1 500 2200 400
Fuel Pump X C .783:1 25 450 -
Fuel Pump X C .803:1 25 450 25
Vacuum pump X C 1.241:1 100 800 25
Vacuum pump X C 1.219:1 200 800 25
Hydraulic pump X C 1.00:1 250 1650 50
Hydraulic pump X C 1.083:1 300 1650 75
Tachometer X X C  .50:1 7 50 -
Prop. governor - X C .801:1 125 825 -
NOTE 4. Deleted November 9, 1953
NOTE 5. Center of Gravity GSO-580
    Location          GSO-580-B GSO-580-C GSO-580-D
From front face of
thrust nut, inches 27.0 26.55 26.69
From crankshaft
center line, inches     .4 below     .16 above     .51 above
    .07 right     .07 right
NOTE 6. The GSO-580-C and GSO-580-D are similar to the models GSO-580 and GSO-580-B respectively
except for incorporation of crosswise accessory drive provisions.
NOTE 7. The following spark plugs are approved on these engines:
AC S-86R, SR-83P, HSR-83P
Autolite SH-2K, SH-2M, SH-20, SH-20A
BG RB485S
Champion R25S, RED37N, REM37N, RHD37N, RHM37N
....END....
```

## ADs (3, 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 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 GSO-580 series](https://openairdocs.org/engine/lycoming-gso-580-series): 2 aircraft (registry code 41537)
- [Lycoming GSO-580](https://openairdocs.org/engine/lycoming-gso-580): 0 aircraft (registry code 42094)
- [Lycoming GSO-580-B](https://openairdocs.org/engine/lycoming-gso-580-b): 0 aircraft (registry code 42096)
- [Lycoming GSO-580-C](https://openairdocs.org/engine/lycoming-gso-580-c): 0 aircraft (registry code 42095)
- [Lycoming GSO-580-D](https://openairdocs.org/engine/lycoming-gso-580-d): 0 aircraft (registry code 42097)

## STCs approved under this data sheet (7)

- [STC SE01966WI](https://openairdocs.org/stc/SE01966WI): Use of GAMI G100UL High Octane Unleaded Avgas in spark ignition piston aircraft engines. General Aviation Modifications Inc.
- [STC SE1779NM](https://openairdocs.org/stc/SE1779NM): Installation of Precise Flight, Inc. Standby Vacuum System SVS III. Precise Flight Inc
- [STC SE09492SC](https://openairdocs.org/stc/SE09492SC): Installation and usage of Exxon 20W50 multigrade aircraft engine oil conforming to Exxon Oil formulation WS-3013.. Exxon Company USA
- [STC SE452NE](https://openairdocs.org/stc/SE452NE): Installation and usage of 'Mobil AV 1' aviation oil.. Mobil Research & Development Corp
- [STC SE5879SW](https://openairdocs.org/stc/SE5879SW): Use of Phillips X/C II 20W-50 and25W-60 oil (OSS 55875) in all Avco reciprocating aircraft engines from 65 to 450 BHP.. Phillips Petroleum Co
- [STC SE128NE](https://openairdocs.org/stc/SE128NE): Use of AMS/OIL 15W 50 synthetic piston aircraft oil in Avco engines.. AMS/OIL
- [STC SE44WE](https://openairdocs.org/stc/SE44WE): Use of Kling Aviation Oil, Specifications KL-100, KL-200 and KL-300 in Continental and Lycoming engines.. Kling Oil Company

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