# TCDS 1E15: Textron Lycoming Subsidiary of Textron Inc. - Type: Type certificate data sheet - Status: Current - Holder: Textron Lycoming Subsidiary of Textron Inc. - Revision: 6 - Revised: February 15, 1988 - Product: Engine - Certification basis: CAR 13 - Registered aircraft: 130, by the registry models matched to it (OpenAirDocs) - Data sheet PDF: https://openairdocs.org/files/sha256/df/10/df1005223041e2ac70825b4dbcb51b13543d1ab761c6677c1f0e24450537b412 - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/6AAFA666C1F501378625887F00685940.0001 - Page: https://openairdocs.org/tcds/1E15 ## Models (12) As the data sheet lists them. - IO-720-B1A - IO-720-D1CD - IO-720-A1A - IO-720-B1B - IO-720-D1BD - IO-720-C1BD - IO-720-A1BD - IO-720-A1B - IO-720-C1B - IO-720-D1C - IO-720-D1B - IO-720-B1BD ## 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 3 Rev. No. 6 6 6 Reformatted 1/95 DEPARTMENT OF TRANSPORTATION FEDERAL AVIATION ADMINISTRATION 1E15 Revision 6 Textron Lycoming IO-720-A1A, -A1B, -A1BD, -B1A, -B1B, -B1BD, -C1B, -C1BD, -D1B, -D1BD, -D1C, -D1CD February 15, 1988 TYPE CERTIFICATE DATA SHEET NO. 1E15 Engines of models described herein conforming with this data sheet (which is a part of Type Certificate No. 1E15) 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 Regulations provided they are installed, operated and maintained as prescribed by the approved manufacturer's manuals and other approved instructions. Manufacturer Textron Lycoming/Subsidiary of Textron, Inc. Williamsport Plant Williamsport, Pennsylvania 17701 Model Lycoming IO-720-A1A, -A1B, -A1BD -B1A, -B1B, -B1BD -C1B, -D1B, -D1C-C1BD -D1BD, -D1CD Type 8H0A Direct Drive - - Rating Max. continuous hp., r.p.m., full throttle at: Sea level pressure altitude: 400-2650* Takeoff, hp., r.p.m., full throttle at: Sea level pressure altitude 400-2650 Fuel (Min. grade aviation gasoline), Service Instruction No. 1070 100/130 Lubricating oil (Lubricating should conform to the Specifications as listed or subsequent revisions thereto) Lycoming Spec. No. 301-F Service Instruction No. 1014 Bore and stroke, in. 5.125 x 4.375 Displacement, cu. in. 722 Compression ratio 8.7:1 Weight (dry), lb. See NOTE 9 Propeller shaft flange, SAE No. Type 2 modified Crankshaft dampers (torsional) one 3.5 order six 4th order one fifth order Fuel injection Bendix RSA-10AD1 RSA-10ED1 (-B1B, -B1BD) Fuel pump See NOTE 2 RG9080-J4A (D1B, -D1C) External fuel filtration requirements 150 micron, max. Ignition, dual See NOTE 9 Ignition timing °BTC 20° Spark plugs See NOTE 6 Oil sump capacity, qt. 19 Usable oil sump capacity, qt. 16 NOTES 1,2,3,4,5,6,7,8,9 *Models IO-720-D1B, -D1C, -D1BD, -D1CD have an alternate rating of 375 hp at 2500 r.p.m. 1E15 2 "C" - Clockwise "CC" - Counter-clockwise. "#" indicates "does not apply" Certification basis: Regulations & Amendments Model Date of Application Date Type Certificate 1E15 Issued/Revised CAR 13 as amended to June 15, 1956 & 13-1, 13-2, 13-3 IO-720-A1A December 6, 1960 October 25, 1961 13-4 IO-720-B1A February 19, 1963 November 4, 1965 IO-720-A1B February 12, 1971 February 22, 1971 IO-720-B1B February 12, 1971 February 22, 1971 IO-720-C1B December 16, 1971 December 22, 1971 IO-720-D1B October 22, 1973 October 29, 1973 IO-720-A1BD August 21, 1975 December 30, 1976 IO-720-B1BD December 28, 1976 December 30, 1976 IO-720-C1BD January 24, 1977 January 28, 1977 IO-720-D1BD January 24, 1977 January 28, 1977 IO-720-D1CD June 6, 1977 June 10, 1977 IO-720-D1C March 11, 1982 April 15, 1982 Production basis: Production Certificate No. 3 NOTE 1. Maximum permissible temperatures are as follows: Cylinder head 500°F (well-type thermocouple) Oil inlet 245°F NOTE 2. Fuel pressure limits: Maximum Minimum Idle (min.) Inlet to fuel pump when supplied with engine -D1B, -D1C 55 p.s.i. -2 p.s.i. # All others 45 p.s.i. -2 p.s.i. # Inlet to injector -B1A, -B1B 35 p.s.i. 25 p.s.i. # All others 45 p.s.i. 18 p.s.i. 12 p.s.i. Oil pressure limits: Idling # 25 p.s.i. Normal operation 95 p.s.i. 55 p.s.i. (50 p.s.i.: -A1A, -A1B) Start & warm-up 115 p.s.i. Fuel Pump (optional) Lear Siegler Model -A1A, -A1B, -A1BD RG17980 or RG9080 -B1BD, -C1B, -C1BD, -D1B, -D1BD, -D1C, -D1CD RG9080 NOTE 3. The following accessory drive provisions are available. IO-720 Model -B1B -B1A -D1C -C1BD Rotation Facing Speed Maximum Torque Maximum Overhang -A1B -D1B -B1BD -D1CD Drive Ratio to (in.-lb) Moment Accessory -A1A -C1B -A1BD -D1BD Pad Crankshaft Cont. Static (in-lb.) Starter X X CC 13.556:1 # 450 150 Alternator X X C 3.20:1 60 120 175 Generator (Optional) X X C 2.50:1 60 120 175 Generator (Opt) X X C 3.1:1 60 120 175 Accessory #1 X X CC 1.3:1 70 450 25 Accessory #2 X # C 1.3:1 100 800 40 Accessory #2 # X C 1.3:1 180 2200 40 Accessory #2 (Opt) # X C 1.3:1 180 2200 100 Tachometer X X C 0.5:1 7 50 5 Fuel Pump X # CC 1:1 25 450 25 Fuel Pump # X C 1:1 25 450 25 Spray Pump (Opt) X X C 1.346:1 250 1600 40 Propeller Gov X X C 0.895:1 125 1200 25 3 1E15 NOTE 4. These engines incorporate provisions for absorbing propeller thrust in both tractor and pusher type installations. NOTE 5. These engines are equipped with all-weather ignition harness as standard equipment. NOTE 6. Spark plugs: See latest revision of Lycoming Service Instruction No. 1042 for approved equipment. NOTE 7. These engines incorporate the following additional characteristics: Model Characteristics IO-720-A1A Basic model. Eight cylinder, horizontally opposed, air-cooled direct drive fuel injection engine, internal oil jet piston cooling. IO-720-A1B Same as -A1A except equipped with Bendix S8LN-1208 and S8LN-1209 magnetos. IO-720-B1A Same as -A1A except for top exhaust cylinders and offset exhaust valve shroud tubes. IO-270-B1B Same as -B1A except equipped with Bendix S8LN-1208 and S8LN-1209 magnetos and Bendix RSA-10ED1 fuel injection. IO-720-C1B Same as -A1B except that it has up-exhaust cylinder heads. IO-720-D1B Same as -A1B except has a rear type air inlet housing instead of a front inlet. IO-720-D1C Same as -D1B except equipped with an angled fuel injector adapter. IO-720-A1BD Same as -A1B except has a dual magneto. IO-720-B1BD Same as -B1B except has a dual magneto. IO-720-C1BD Same as -C1B except has a dual magneto. IO-720-D1BD Same as -D1B except has a dual magneto. IO-720-D1CD Same as -D1C except has a dual magneto. NOTE 8. Starters, generators and alternators approved for use on these engines are listed in the latest revision of AVCO Lycoming Service Instructions No. 1154. NOTE 9. IO-720 Model, Weight (dry), ignition, dual, and C.G. C.G. Location (dry) including starter and generator Model Weight Magnetos Propeller Flange Front Face, in. Below Crankshaft C.L., in. Off Crankshaft C.L. in. -A1A 565 Bendix S8LN-701, S8LN-705 21.33 0.91 0.20 Left -A1B 565 S8LN-1208, S8LN-1209 21.33 0.91 0.20 Left -B1A 557 S8LN-701, S8LN-705 21.90 0.80 0.10 Left -B1B 557 S8LN-1208, S8LN-1209 21.90 0.80 0.10 Left -C1B 566 S8LN-1208, S8LN-1209 21.33 0.91 0.20 Left -D1B 580 S8LN-1208, S8LN-1209 21.33 0.91 0.20 Left -A1BD 561 D8LN-2200 21.13 0.81 0.00 Left to Right -B1BD 557 D8LN-2230 21.70 0.70 0.10 Right -C1BD 563 D8LN-2230 21.13 0.81 0.0 Left to Right -D1BD, -D1CD 571 D8LN-2200 21.70 0.70 0.10 Right -D1C 580 S8LN-1208, S8LN-1209 21.33 0.91 0.20 Left .....END..... ``` ## ADs (28, in force first) - [AD 2026-04-11](https://openairdocs.org/ad/2026-04-11): Engine (Reciprocating) · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 605 more. Effective Apr 8, 2026 - [AD 2022-16-03](https://openairdocs.org/ad/2022-16-03): Engine (RECIPROCATING) · Continental Aerospace Technologies GTSIO-520-C, GTSIO-520-D, GTSIO-520-F and 236 more. Effective Aug 15, 2022 - [AD 2017-16-11](https://openairdocs.org/ad/2017-16-11): Reciprocating Engine Power Section · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-360-B1G6 and 93 more. Effective Aug 15, 2017 - [AD 2015-19-07](https://openairdocs.org/ad/2015-19-07): Fuel injector fuel lines · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1B and 187 more. Effective Nov 3, 2015 - [AD 2012-19-01](https://openairdocs.org/ad/2012-19-01): Crankshafts · Lycoming Engines AEIO-360-A1A, AEIO-360-A1B, AEIO-360-A1B6 and 321 more. Effective Oct 24, 2012 - [AD 2011-18-09](https://openairdocs.org/ad/2011-18-09): Crankshaft failure · Textron Lycoming, AVCO IO-720-A1B. Effective Sep 29, 2011 - [AD 2010-07-08](https://openairdocs.org/ad/2010-07-08): Turbochargers · Kelly Aerospace Energy Systems HIO-360-E1AD, HIO-360-E1BD, HIO-360-F1AD and 137 more. Effective Apr 19, 2010 - [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 2003-14-03](https://openairdocs.org/ad/2003-14-03): Rotary fuel pumps · Lycoming Engines AEIO-540-D4A5, AEIO-540-D4B5, AEIO-540-D4C5 and 262 more. Effective Aug 14, 2003 - [AD 2002-12-07](https://openairdocs.org/ad/2002-12-07): Oil Filter Converter Plate Gasket or the Converter Plate Kit · Lycoming Engines HIO-360-E1AD, HIO-360-E1BD, HIO-360-F1AD and 95 more. Effective Jul 3, 2002 - [AD 98-17-11](https://openairdocs.org/ad/98-17-11): Crankshafts · Continental Motors A-65-3, A-65-8, A75-8 and 90 more. Effective Oct 19, 1998 - [AD 97-15-11](https://openairdocs.org/ad/97-15-11): Cylinder kits · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 538 more. Effective Aug 12, 1997 - [AD 95-07-01](https://openairdocs.org/ad/95-07-01): Connecting Rod Bolt · Lycoming Engines AEIO-360-A1E, AEIO-360-B1G6, AEIO-360-H1A and 177 more. Effective Apr 12, 1995 - [AD 92-12-05](https://openairdocs.org/ad/92-12-05): Piston Pins · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 532 more. Effective Jul 10, 1992 - [AD 79-04-05](https://openairdocs.org/ad/79-04-05): Regulator Diaphragm Stem Assembly · Lycoming Engines AEIO-320-D1B, AEIO-320-E1A, AEIO-320-E1B and 215 more. Effective Sep 26, 1979 - [AD 79-12-07](https://openairdocs.org/ad/79-12-07): Magnetos · Bendix Magnetos, TIO-540-F2BD, TIO-540-N2BD and 3 more. Effective Jun 19, 1979 - [AD 78-23-10](https://openairdocs.org/ad/78-23-10): Center Body Bellows Seal Assembly · Lycoming Engines AEIO-320-D1B, AEIO-320-E1A, AEIO-320-E1B and 218 more. Effective Nov 7, 1978 - [AD 73-23-01](https://openairdocs.org/ad/73-23-01): Piston Pin Assembly · Lycoming Engines AIO-360-A1A, AIO-360-A1B, AIO-360-A2A and 215 more. Effective Jan 13, 1977 - [AD 75-09-15](https://openairdocs.org/ad/75-09-15): Fuel Starvation To The Engine · Lycoming Engines AIO-320-A1A, AIO-320-A1B, AIO-320-A2A and 130 more. Effective Apr 30, 1975 - [AD 73-10-02](https://openairdocs.org/ad/73-10-02): Bendix Fuel Injectors · Bendix Fuel Injectors, AIO-320-A1A, AIO-320-A1B and 88 more. Effective May 16, 1973 - [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 - [AD 2011-26-04](https://openairdocs.org/ad/2011-26-04) (historical): Externally mounted fuel injector fuel lines · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1B and 186 more. Effective Jan 25, 2012 - [AD 2011-15-10](https://openairdocs.org/ad/2011-15-10) (historical): Fuel servos · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 256 more. Effective Aug 16, 2011 - [AD 2008-14-07](https://openairdocs.org/ad/2008-14-07) (historical): Externally mounted fuel injector fuel lines · Textron Lycoming, AVCO AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1B and 185 more. Effective Aug 14, 2008 - [AD 2006-20-09](https://openairdocs.org/ad/2006-20-09) (historical): Certain crankshafts replacing · Lycoming Engines AEIO-360-A1B6, AEIO-360-A1E6, AEIO-540-D4A5 and 82 more. Effective Nov 3, 2006 - [AD 2002-26-01](https://openairdocs.org/ad/2002-26-01) (historical): Fuel injector fuel lines · Textron Lycoming, AVCO IGO-480-A1B6, IGO-540-B1A, IGO-540-B1C and 178 more. Effective Jan 31, 2003 - [AD 98-18-12](https://openairdocs.org/ad/98-18-12) (historical): Fuel Pump · Textron Lycoming, AVCO AEIO-540-D4A5, AEIO-540-D4B5, AEIO-540-D4C5 and 249 more. Effective Sep 28, 1998 - [AD 2000-18-53](https://openairdocs.org/ad/2000-18-53) (historical): Oil Filter Converter Plate Gaskets · Textron Lycoming, AVCO AEIO-540, IO-360-A1B6D, IO-360-A1D6D and 73 more ## Registered aircraft by registry model (OpenAirDocs) - [Lycoming IO-720](https://openairdocs.org/engine/lycoming-io-720-series): 120 aircraft (registry code 41546) - [Lycoming IO-720-A1B](https://openairdocs.org/engine/lycoming-io-720-a1b): 8 aircraft (registry code 41949) - [Lycoming IO-720-C1B](https://openairdocs.org/engine/lycoming-io-720-c1b): 1 aircraft (registry code 41954) - [Lycoming IO-720-D1CD](https://openairdocs.org/engine/lycoming-io-720-d1cd): 1 aircraft (registry code 41959) - [Lycoming IO-720-A1A](https://openairdocs.org/engine/lycoming-io-720-a1a): 0 aircraft (registry code 41948) - [Lycoming IO-720-A1BD](https://openairdocs.org/engine/lycoming-io-720-a1bd): 0 aircraft (registry code 41950) - [Lycoming IO-720-B1B](https://openairdocs.org/engine/lycoming-io-720-b1b): 0 aircraft (registry code 41951) - [Lycoming IO-720-B1BD](https://openairdocs.org/engine/lycoming-io-720-b1bd): 0 aircraft (registry code 41953) - [Lycoming IO-720-C1BD](https://openairdocs.org/engine/lycoming-io-720-c1bd): 0 aircraft (registry code 41955) - [Lycoming IO-720-D1B](https://openairdocs.org/engine/lycoming-io-720-d1b): 0 aircraft (registry code 41956) - [Lycoming IO-720-D1BD](https://openairdocs.org/engine/lycoming-io-720-d1bd): 0 aircraft (registry code 41957) - [Lycoming IO-720-D1C](https://openairdocs.org/engine/lycoming-io-720-d1c): 0 aircraft (registry code 41958) ## STCs approved under this data sheet (32) - [STC SE00825WI](https://openairdocs.org/stc/SE00825WI): Installation of Specialty Products Spin-on oil filter on Lycoming Engines.. B & C Specialty Products Inc. - [STC SE02352CH](https://openairdocs.org/stc/SE02352CH): Installation of Challenger cleanable oil filter assembly. Challenger Aviation Products Inc. - [STC SE00939WI](https://openairdocs.org/stc/SE00939WI): Installation of B&C Specialty Products Model BC 315-( ) Starter on Lycoming engines.. B & C Specialty Products Inc. - [STC SE51WE](https://openairdocs.org/stc/SE51WE): Installation of two (2) Roto-Master (Rajay) P/N 600573-00 (RJ0326, RJ0326-1) or 600576-00 (RJ0326-2) (or any combination thereof) Turbochargers. TALCO Aviation - [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 SE8628SW](https://openairdocs.org/stc/SE8628SW): Installation of oil nozzles for lubrication of cam and filters.. Cygnet Aerospace Corp - [STC SE09445SC](https://openairdocs.org/stc/SE09445SC): Installation of fuel injector nozzles.. General Aviation Modifications Inc. - [STC SE1339SW](https://openairdocs.org/stc/SE1339SW): Modify pistons to Drawings 11007 and 11015; piston rings. Continental Motors, Inc. - [STC SE4408SW](https://openairdocs.org/stc/SE4408SW): Miscellaneous engine cylinder replacement parts.. Continental Motors, Inc. - [STC SE7506SW](https://openairdocs.org/stc/SE7506SW): Installation of any or all parts listed on Airmotive Engineering Drawing List No. 852-1, Rev. 1, dated 10/4/88, or later FFA approved revision.. Continental Motors, Inc. - [STC SE7670SW](https://openairdocs.org/stc/SE7670SW): Installation of parts listed on Drawing List No. 8810-3, Rev 6.. Continental Motors, Inc. - [STC SE8776SW](https://openairdocs.org/stc/SE8776SW): Installation of coated cylinders and piston rings.. Continental Motors, Inc. - [STC SE00226NY](https://openairdocs.org/stc/SE00226NY): Replacement of Lycoming starter with SKY-TEC 24-volt starter Models 149-24HT and 122-24HT. Approval limited to 24-volt DC source available to the starter.. Hartzell Engine Technologies, LLC - [STC SE2902NM](https://openairdocs.org/stc/SE2902NM): Lycoming valve cover gasket. Real Gaskets Tennessee - [STC SE7582SW](https://openairdocs.org/stc/SE7582SW): Grinding of high compression NITRIDED Cylinders to .010 oversize, as an alternative to chrome plating or rebarreling, and the installation of SL10207 P10 Piston, SL74241 P10 Top and second compression ring, and SL 73857 P10 oil control ring. Superior Air Parts, Inc - [STC SE02436AT](https://openairdocs.org/stc/SE02436AT): Installation of 200F series fuel pump assembly.. Kelly Aerospace Energy Systems LLC - [STC SE02555AT](https://openairdocs.org/stc/SE02555AT): Consolidated Fuel Systems 201F series fuel pump assembly on various Textron Lycoming engine models.. Kelly Aerospace Energy Systems LLC - [STC SE62WE](https://openairdocs.org/stc/SE62WE): Installation of two Rajay turbo- chargers, P/N RJ 0326 or -1 or -2.. RPM Commander LLC - [STC SE707GL](https://openairdocs.org/stc/SE707GL): Installation of a fuel flow transducer.. Shadin Avionics - [STC SE01930NY](https://openairdocs.org/stc/SE01930NY): Installation of Casper Labs 90 degree oil filter housing adapter.. Casper Labs 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 SE00350SE](https://openairdocs.org/stc/SE00350SE): Installation of sump mounted chip detector.. Aviation Development Corporation - [STC SE00299WI](https://openairdocs.org/stc/SE00299WI): Installation of B & C Specialty Products lightweight (10.2 pounds) engine starter P/N BC315-100-1(12 volts) or P/N BC 315-100-3(24 volts).. Bainbridge William C III - [STC SE8023SW](https://openairdocs.org/stc/SE8023SW): Installation and usage of AEROSHELL. Shell Development Co - [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 SE5924SW](https://openairdocs.org/stc/SE5924SW): Installation of stainless steel replacement exhaust studs on AVCO engines.. Perrigo & Steele Aircraft Engr Company - [STC SE128NE](https://openairdocs.org/stc/SE128NE): Use of AMS/OIL 15W 50 synthetic piston aircraft oil in Avco engines.. AMS/OIL - [STC SE63WE](https://openairdocs.org/stc/SE63WE): Installation of starter ring gear support assembly.. Adler Neil J - [STC SE163SO](https://openairdocs.org/stc/SE163SO): Two Rajay trubochargers 325E10.. Riley Intl Corp - [STC SE205SO](https://openairdocs.org/stc/SE205SO): Two Rajay trubochargers 325H10.. Riley Intl Corp --- 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.