- Holder
- Lycoming Engines
- Revision
- 10
- Revised
- April 4, 2018
- Status
- Current
- Product
- Engine
- Certification basis
- CAR 13
- Models
- 32
- Registered
- 1,967 aircraft
The release keeps the latest revision of each data sheet. Model names are as the data sheet lists them.
On this page
Models · 32
| Model | Also known as | Note |
|---|---|---|
| AEIO-320-E1B | Formerly Textron Lycoming, AVCO Corporation | |
| AEIO-320-D2B | Formerly Textron Lycoming, AVCO Corporation | |
| AIO-320-C1B | Formerly Textron Lycoming, AVCO Corporation |
Airworthiness directives · 46
ADs whose products are models on this data sheet, matched by model and maker.
AD 2026-04-11Engine (Reciprocating)AD 2022-16-03Engine (RECIPROCATING)AD 2017-16-11Reciprocating Engine Power Section
See all 46 ADsRegistered aircraft
Registry models that point at this data sheet, with their registered aircraft.
Lycoming IO-320 series1,707 registered aircraftLycoming AEIO-320 series74 registered aircraftLycoming IO-320-D1A58 registered aircraft
See all 35 registry modelsSTCs approved under this data sheet · 45
STC SE04651CHTo allow use of l00R grade aviation fuel meeting Swift Fuel, LLC specification SPEC-l00R-22STC SE00825WIInstallation of Specialty Products Spin-on oil filter on Lycoming Engines.STC SE04349CHInstallation of SureFly electronic ignition
See all 45 STCsWhat the data sheet says
From the PDF’s text layer, line by line: tables lose their columns. The PDF is the record.
Page No. 1 2 3 4 5 6 7
Rev. No. 10 10 8 8 8 8 8
DEPARTMENT OF TRANSPORTATION
FEDERAL AVIATION ADMINISTRATION
1E12
Revision 10
Lycoming Engines
IO-320 -A1A-A2A-B1A, -B1B, B1C, -B1E, -B1D, -B2A,
-C1A, -C1B, -D1A, -D1C, -D1B, -E1A, -E1B,
-E2A, -E2B, -F1A
LIO-320-B1A, -C1A
AIO-320-A1A, -A1B, -A2A, -A2B, -B1B, -C1B
AEIO-320-D1B, -D2B, -E1A, -E1B, -E2A, -E2B
April 4, 2018
TYPE CERTIFICATE DATA SHEET NO. 1E12
Engines of models described herein conforming with this data sheet (which is a part of type certificate No. 1E12) and other
approved data on file with the Federal Aviation Administration, meet the minimum standards for use in certificated aircraft in
accordance with pertinent aircraft data sheets and applicable portions of the Civil Air Regulations/Federal Aviation Regulati ons
provided they are installed, operated and maintained as prescribed by the approved manufacturer’s manuals and other approved
instructions.
Type Certificate Holder Lycoming Engines
An Operating Division of AVCO Corporation
Williamsport, Pennsylvania 17701
Type Certificate Holder Record AVCO Lycoming Textron, Williamsport Division transferred TC 1E12 to Lycoming
Engines, An Operating Division of AVCO Corporation on December 17, 2003
Model Lycoming IO-320-A1A IO-320-B1A,-B1B IO-320-C1A AEIO-320-E1A
Type 4HOA Direct Drive -A2A,-E1A -B1C,-B1D, -B2A -C1B, -F1A -E1B,-E2A
-E2A,-E1B -B1E, -D1A, -D1B LIO-320- -E2B
-E2B -D1C C1A,
LIO-320-B1A
Rating
Maximum continuous, hp.,r.p.m.
full throttle at:
Sea level pressure altitude 150-2700-S.L. 160-2700-S.L. - - 150-2700-S.L.
Takeoff, hp., r.p.m., full throttle at
Sea level pressure altitude 150-2700-S.L. 160-2700-S.L. - - 150-2700-S.L.
Fuel (min grade aviation gasoline) Latest revision of Lycoming
Service Instruction No. 1070
- - - - - -
Lubricating oil (Lubricants should
conform to the specification as listed or
subsequent revisions)
Latest revisions of Lycoming
Spec.No. 301 and Service
Instruction 1014
- - - - - -
Bore and Stroke, in. 5.125 x 3.875 - - - - - -
Displacement, cu.in. 320 - - - - - -
Compression ratio 7.00:1 8.50:1 - - 7.00:1
Weight, lb. See NOTE 9 - - - - - -
C. G. location See NOTE 9 - - - - - -
Propeller shaft flangs, SAE No. AS 127 Type 2 modified - - - - - -
Crankshaft dampers and balancers None - - - - - -
Fuel Injector Bendix RSA -5AD1 - - - - - -
Ignition, dual See NOTE 9 - - - - - -
Timing, °BTC 25 - - - - - -
Spark plugs See NOTE 4 - - - - - -
Oil sump capacity, qt. 8 - - - - - -
Minimum usable oil,qt. (30° nose up or
down)
2 - - - - —
Minimum usable oil,qt. (30° nose up, 20°
nose down)
— — — 4
NOTES 1,2,3,4,5,6,7,8,9 - - - - - -
“- -” same as preceding: “—”does not apply.
1E12 Page 2 of 8
Model Lycoming AIO-320-A1A AEIO-320-D1B,
Type 4HOA Direct Drive -A1B,-A2A, -A2B,-B1B, -
C1B
-D2B
Rating
Maximum continuous, hp.,r.p.m.
full throttle at:
Sea level pressure altitude 160-2700-S.L. - -
Takeoff, hp., r.p.m., full throttle at
Sea level pressure altitude 160-2700-S.L - -
Fuel (min grade aviation gasoline) Latest revision of Lycoming
Service Instruction No. 1070
- -
Lubricating oil (Lubricants should conform
to the specification as listed or subsequent
revisions)
Latest revisions of Lycoming
Spec.No. 301 and Service
Instruction 1014
- -
Bore and Stroke, in. 5.125 x 3.875 - -
Displacement, cu.in. 320 - -
Compression ratio 8.50:1 - -
Weight, lb. See NOTE 9 - -
C. G. location See NOTE 9 - -
Propeller shaft flangs, SAE No. AS 127 Type 2 modified - -
Crankshaft dampers and balancers None - -
Fuel Injector Bendix RSA -5AD1 - -
Ignition, dual See NOTE 9 - -
Timing, °BTC 25 - -
Spark plugs See NOTE 4 - -
Oil sump capacity, qt. Dry sump 8
Minimum usable oil,qt. (30 ° nose up or
down)
— —
Minimum usable oil,qt. (30 ° nose up, 20°
nose down)
— 4
NOTES 1,2,3,4,5,6,7,8,9 - -
“- -” same as preceding: “—”does not apply.
Certification basis:
Date Type Certificate
No.1E12
Regulations & Amendments Model Date of Application Issued/Revised
CAR 13 effective June 15,1956
As amended by 13-1,13-2,13-3 IO-320-A1A February 16, 1961 April 10, 1961
IO-320-A2A February 16, 1961 April 10, 1961
13-1,13-2,13-3 & 13-4 IO-320-B1A September 18, 1962 January 24, 1963
IO-320-B2A September 18, 1962 January 24, 1963
IO-320-B1B December 12, 1963 December 31, 1963
IO-320-C1A January 18, 1965 May 7, 1965
IO-320-B1C April 1, 1965 May 5, 1965
IO-320-E2A March 11, 1966 March 28, 1966
IO-320-B1D April 11, 1966 April 27, 1966
IO-320-D1A February 25, 1969 February 27, 1969
IO-320-E1A April 16, 1970 April 21, 1970
IO-320-D1B July 24, 1970 August 3, 1970
IO-320-E2B May 4, 1972 May 15, 1972
AIO-320-A1A June 16, 1969 June 23, 1969
AIO-320-A1B June 16, 1969 June 23, 1969
AIO-320-A2A June 16, 1969 June 23, 1969
AIO-320-A2B June 16, 1969 June 23, 1969
AIO-320-B1B June 16, 1969 June 23, 1969
AIO-320-C1B July 29, 1971 August 9, 1971
LIO-320-B1A August 19, 1969 August 28, 1969
Page 3 of 8 1E12
Certification basis: (Cont.)
LIO-320-C1A August 19, 1969 August 28, 1969
IO-320-P1A December 19, 1973 January 8, 1974
IO-320-E1B January 10, 1974 January 14, 1974
AEIO-320-E1A April 2, 1974 April 12, 1974
AEIO-320-E1B April 2, 1974 April 12, 1974
AEIO-320-E2A April 2, 1974 April 12, 1974
AEIO-320-E2B April 2, 1974 April 12, 1974
AEIO-320-D1B October 5, 1976 October 8, 1976
AEIO-320-D2B May 29, 1980 June 9,1980
IO-320-D1C July 24, 1986 August 6, 1986
IO-320-B1E August 19, 1986 September 10, 1986
IO-320-C1B November 11, 1986 December 3, 1986
Production basis: Production Certificate No. 3
NOTE 1. Maximum permissible temperatures, ° F:
Cylinder head (well-type thermocouple) 500
Cylinder base (not applicable to engine models 325
which incorporate internal piston cooling oil jets)
Oil inlet 245
Fuel injector air inlet (IO-320-C1A, F1A 400
LIC-320-C1A)
NOTE 2. Pressure limits:
Fuel: Inlet to Diaphragm Pump Inlet to Injector
Maximum
with
Injector in
Maximum Minimum Idle Cut-Off Maximum Minimum Idle
IO-320-A1A, -A2A,-B1A, 35 -2 - 45 12 -
-B1B,-B1C,-B1D,-B1C
-B1E,-B2A,-D1A,-D1B,
-D1C,-E1A, -E1B, -E2B
,-E2A
IO-320-C1A,-C1B,-F1A* 45 -2 55 45 12 12
AEIO-320-D & E series 35 -2 - 45 12 -
LIO-320-B1A 35 -2 - 45 12 -
LIO-320-C1A, -C1B * 45 -4 55 45 12 12
AIO-320-A,-B & -C Series 35 -2 55 45 14 -
Boost pump outlet limits to injectors: Parallel Boosts Series Boosts
AIO-320-A, -B & -C Series Maximum Minimum Maximum Minimum
Zero Fuel Flow 45 p.s.i. - 35 p.s.i. -
Maximum Fuel Flow - 14 p.s.i. - 14 p.s.i.
Oil: Maximum Minimum
Normal Operating Starting and Warm-up Normal Idling
90 p.s.i. 100 p.s.i. 60 p.s.i. 25 p.s.i.
Manifold pressure, in. Hg. – Absolute 29 max. (IO-320-C1A, -F1A, LIO-320-C1A)
Exhaust back pressure, in. Hg. – Absolute 32 max. (IO-320-C1A, -F1A, LIO-320-C1A)
*AN-type fuel pump.
1E12 Page 4 of 8
NOTE 3. The following accessory provisions are incorporated:
IO-320
IO-320
IO-320
-D1A,-E1A
-E2B, -E2A
Speed
Max. Torque
Maximum
Overhang
-A1A,-A2A,
-B1A,-B1C,
-B1B,
-C1A,-C1B
AEIO-320-
E1A, -E1B,
Rotation
Facing Drive
Ratio to ( in.- lb.) Moment
Accessory -B2A, -B1D -F1A -E2A Pad Crankshaft Cont Static (in. – lb.)
Starter * * * CC 13.556:1 - 450 150
Starter ** ** ** CC 16.556:1 - 450 150
Generator * * - C 1.91:1 60 120 175
Generator ** ** - C 2.500:1 60 120 175
Alternator ** * * C 3.250:1 60 120 175
Fuel pump, plunger * - * - 0.500:1 - - 10
Fuel Pump - * - CC 1.000:1 25 450 25
Vacuum Pump * * * CC 1.300:1 70 450 25
Hydraulic Pump - - - C 1.300:1 100 800 40
Tachometer * * * C 0.500:1 7 50 5
Propeller governor - - - C 0.895:1 125 1200 40
Propeller governor * * * C 0.866:1 125 1200 40
Optional Dual Drive Mounting on Vacuum Pump Drive Pad
(Vacuum Pump) ** ** ** CC 1.300:1 70 450 6
(Hydraulic Pump) ** ** ** CC 1.300:1 Total Total 10
or
(Vacuum Pump) ** ** ** CC 1.300:1 70 450 6
(Prop. Governor) ** ** ** CC 1.300:1 Total Total 10
IO-320 AIO-320-
IO-320-
-E2B,
-B1E, -D1B,
-D1C
-A1A, -A1B,
-A2A, -A2B,
Rotation
Speed
Max. Torque
Maximum
Overhang
AEIO-320 AEIO-320 -B1B, Facing Drive Ratio to ( in.- lb.) Moment
Accessory -E2B -D1B, -D2B -C1B Pad Crankshaft Cont Static (in. – lb.)
Starter * * -- CC 13.556:1 - 450 150
Starter ** ** * CC 16.556:1 - 450 150
Generator - - - C 1.91:1 60 120 175
Generator - - - C 2.500:1 60 120 175
Alternator * * * C 3.250:1 60 120 175
Fuel pump, plunger * * * - 0.500:1 - - 10
Fuel Pump - - - CC 1.000:1 25 450 25
Vacuum Pump * * * CC 1.300:1 70 450 25
Hydraulic Pump - * - C 1.300:1 100 800 40
Tachometer * * * C 0.500:1 7 50 5
Propeller governor - * * C 0.895:1 125 1200 40
Propeller governor - - - C 0.866:1 125 1200 40
Optional Dual Drive Mounting on Vacuum Pump Drive Pad
(Vacuum Pump) - - ** CC 1.300:1 70 450 6
(Hydraulic Pump) - - ** CC 1.300:1 Total Total 10
or
(Vacuum Pump) - - - CC 1.300:1 70 450 6
(Prop. Governor) - - - CC 1.300:1 Total Total 10
“C” – Clockwise, “CC” – Counterclockwise
• - Standard. ** - Optional
Models with a “2” designation (A2A) have no provision for propeller governor drive
Page 5 of 8 1E12
NOTE 3. (continued)
Rotation
Speed
Max. Torque
Maximum
Overhang
LIO-
320-
LIO-320 Facing Drive Ratio to ( in.- lb.) Moment
Accessory -B1A -C1A Pad Crankshaft Cont Static (in. – lb.)
Starter * * C 13.556:1 - 450 150
Starter ** ** C 16.556:1 - 450 150
Generator - - - 1.91:1 60 120 175
Generator - - - 2.500:1 60 120 175
Alternator * * CC 3.250:1 60 120 175
Fuel pump, plunger * - - 0.500:1 - - 10
Fuel Pump - * C 1.000:1 25 450 25
Vacuum Pump * * C 1.300:1 70 450 25
Hydraulic Pump - - CC 1.300:1 100 800 40
Tachometer * * CC 0.500:1 7 50 5
Propeller governor - - - 0.895:1 125 1200 40
Propeller governor * * CC 0.866:1 125 1200 40
Optional Dual Drive Mounting on Vacuum Pump Drive Pad
(Vacuum Pump) ** ** C 1.300:1 70 450 6
(Hydraulic Pump) ** ** C 1.300:1 Total Total 10
or
(Vacuum Pump) ** ** C 1.300:1 70 450 6
(Prop. Governor) ** ** C 1.300:1 Total Total 10
“C” – Clockwise, “CC” – Counterclockwise
* - Standard. ** - Optional
NOTE 4. Spark plugs: See latest revision of Lycoming Service Instruction No. 1042 for approved equipment.
NOTE 5. This engine incorporates provisions for absorbing propeller thrust in both tractor and pusher type
installations.
NOTE 6. This engine is approved for horizontal helicopter application and operation.
NOTE 7. These engines incorporate the following similarities or differences:
IO-320-A1A - Basic model – four cylinder, horizontally-opposed, air cooled, direct drive, fuel injection
engine with automotive type generator and starter.
-A2A - Similar to -A1A but has provisions for fixed pitch propeller.
-B1A - Same as -A1A except that fuel injector is offset toward the fore and aft centerline of engine.
-B1B - Similar to -B1A except has an AN fuel pump drive.
-B1C - Similar to -B1A but has adapter for mounting fuel injector straight to rear.
-BID - Similar to -B1C but has S-1200 series high altitude magnetos.
-B2A - Similar to -BIA but has provisions for fixed pitch propeller.
-B1E - Same as – D1C except horizontal fuel injector
-C1A - Normally aspirated, similar to -B1B except has features making it suitable for turbo
supercharging by STC. See limits, NOTES 1 and 2. Incorporates internal piston cooling oil
nozzles.
-C1B Same as –C1A except horizontal rear mounted fuel injector
-DIA - Similar to -B1D except has type 1 Dynafocal mounts, S4LN-1227 and S4LN-1209 magnetos
and has fuel injection mounted vertically under the sump.
-DIB - Similar to -DIA except has propeller governor drive located on left front of crankcase
instead
of on accessory housing.
-D1C Same as –D1B except Slick Magnetos
-EIA - Identical to -E2A except has provisions for controllable pitch propeller.
-E1B - Similar to -E1A except is equipped with Slick 4050 and 4051 magnetos.
-E2A - Similar to -A2A except uses Scintilla S4LN-20 and S4LN-21 magnetos, has straight conical
mounts, and has fuel injector mounted under the sump.
-E2B - Similar to -E2A but is equipped with Slick 4050 and 4051 magnetos.
-F1A - Similar to -C1A except has Type 1 (30°) dynafocal mount attachment instead of Type 2
1E12 Page 6 of 8
(18°) mount attachment.
Page 7 of 8 1E12
AIO-320-A1A - Similar to IO-320-B1D except permits operation in an inverted position. Differences
include
a front mounted propeller governor, two dry oil sumps, dual external oil scavenge pumps,
an
oil tank, three options of position for fuel injector mounting and Type 1 Dynafocal mount.
-A1B - Similar to AIO-320-A1A except uses one impulse coupling magneto.
-A2A - Similar to AIO-320-A1A but uses a fixed pitch propeller.
-A2B - Similar to AIO-320-A1A but uses one impulse coupling magneto and has a fixed pitch
propeller.
-B1B - Similar to AIO-320-A1B except has front mounted fuel injector.
-C1B - Identical to AIO-320-B1B except that the fuel injector is vertically mounted on bottom of
sump in a forward position.
LIO-320-B1A - Similar to IO-320-B1A except counter clockwise rotation of engine and reverse rotation of
accessories. Uses modified starter ring gear, crankshaft, cam shaft, accessory housing and
oil pump body.
-C1A - Similar to IO-320-C1A except incorporates changes shown for LIO-320-B1A. Suitable for
turbo-supercharging – See limits, NOTES 1 and 2.
AEIO-320-D1B- Similar to IO-320-D1B except is equipped with an inverted oil system kit for aerobatic
flight.
-D2B Same as AEIO-320-D1A except no provision for propeller governor.
-E1A - Similar to IO-320-E1A except I equipped with an inverted oil system kit for aerobatic
flight.
-E1B - Similar to IO-320-E1B except is equipped with an inverted oil system kit for aerobatic
flight.
-E2A - Similar to IO-320-E2A except is equipped with an inverted oil system kit for aerobatic
flight.
-E2B - Similar to IO-320-E2B except is equipped with an inverted oil system kit for aerobatic
flight.
NOTE 8. Starters, generators and alternators approved for use on these engines are listed in the latest revision of AVCO
Lycoming Service Instruction No. 1154.
NOTE 9. The following tabulation shows weights, C.G.s and magnetos for these models:
Center of Gravity
From front face
of Prop. Shaft
Off Crankshaft
Ignition Dual
Model *Weight Flange;in. Center Line, in. Bendix + Slick
IO-320-A1A 252 14.59 1.24 Below-.17 Left S4LN-200,S4LN-204 -
-A2A 252 14.59 1.24 Below-.17 Left S4LN-200,S4LN-204 -
-B1A 259 14.61 1.02 Below-.08 Left S4LN-20,S4LN-21 or S4LN-21,
S4LN-21
-
-B1B 257 14.61 1.02 Below-.08 Left S4LN-20,S4LN-21 or S4LN-21,
S4LN-21
-
-B1C 259 14.61 1.02 Below-.08 Left S4LN-20,S4LN-21 or S4LN-21,
S4LN-21
-
-B1D 260 14.61 1.02 Below-.08 Left S4LN-1209, S4LN-1208 -
-B1E 264 14.06 1.31 Below- .03 Right - 4251, 4250
-B2A 259 14.61 1.02 Below-.08 Left S4LN-20,S4LN-21 or S4LN-21,
S4LN-21
-
-C1A 269 14.61 1.02 Below-.08 Left S4LN-21,S4LN-21 -
-C1B 269 14.61 1.02 Below-.08 Left S4LN-21,S4LN-21 -
-D1A 261 14.59 1.24 Below-.17 Left S4LN-1227, S4LN-1209 -
-D1B 263 14.59 1.24 Below-.17 Left S4LN-1227, S4LN-1209 -
-D1C 263 13.77 1.44 Below-.03 Right - 4251, 4250
-E1A 255 14.59 1.24 Below-.17 Left S4LN-20,S4LN-21 -
-E1B 253 14.59 1.24 Below-.17 Left - 4051, 4050
-E2A 255 14.59 1.24 Below-.17 Left S4LN-20,S4LN-21 -
-E2B 255 14.59 1.24 Below-.17 Left - 4051, 4050
-F1A 269 14.61 1.02 Below-.08 Left S4LN-21,S4LN-21 -
AIO-320-A1A 275 14.74 0.93 Below-.01 Left S4LN-1208, S4LN-1209 -
-A1B 276 14.74 0.93 Below-.01 Left S4LN-1227, S4LN-1209 -
1E12 Page 8 of 8
-A2A 275 14.74 0.93 Below-.01 Left S4LN-1208, S4LN-1209 -
-A2B 276 14.74 0.93 Below-.01 Left S4LN-1227, S4LN-1209 -
-B1B 276 14.74 0.93 Below-.01 Left S4LN-1227, S4LN-1209 -
-C1B 276 14.74 0.93 Below-.01 Left S4LN-1227, S4LN-1209 -
LIO-320-B1A 262 14.61 1.02 Below-.08 Left S4RN-21,S4RN-20 or S4RN-21,
S4RN-21
-
-C1A 269 14.61 1.02 Below-.08 Left S4RN-21, S4RN-21
-
AEIO-320-D1B 271 14.59 1.24 Below-.17 Left S4LN-1227, S4LN-1209 -
-D2B 271 14.59 1.24 Below-.17 Left S4LN-1227, S4LN-1209 -
-E1A 262 14.59 1.24 Below-.17 Left S4LN-21, S4LN-20 -
-E1B 258 14.59 1.24 Below-.17 Left - 4051, 4050
-E2A 262 14.59 1.24 Below-.17 Left S4LN-21, S4LN-20 -
-E2B 260 14.59 1.24 Below-.17 Left - 4051, 4050
* Standard engine dry weight less starter and generator/alternator.
+ For alternate magnetos see latest issue of Textron Lycoming Service Instruction 1443
...END...