Engines · piston (reciprocating) · data as of October 5, 2026

Jacobs L4 /R755-7

225 aircraft on the U.S. register carry a Jacobs L4 /R755-7 engine, rated at about 245 horsepower. The Cessna 195 is the model most often fitted with it (91 aircraft). The aircraft carrying it were built between 1929 and 1965.

The FAA records engines by code, usually at the level of a series ("O-320 series") rather than the exact variant; this page gathers every FAA code that reads as Jacobs L4 /R755-7. FAA spelling: L4 /R755-7.

Fitted to model families

Cessna 19591Cessna T-5027Waco YKS-718Waco YKS-613Beechcraft B175Waco YQC-65Beechcraft C175Beechcraft E175Waco YKC4Waco YMF4Waco YOC4Fairchild 244

Cessna 195 · Cessna T-50 · Waco YKS-7 · Waco YKS-6 · Beechcraft B17 · Waco YQC-6 · Beechcraft C17 · Beechcraft E17 · Waco YKC · Waco YMF

Where they are owner's state

Texas22California19Ohio16Washington14Illinois10Tennessee9Pennsylvania9Florida8Delaware8Virginia7

Kind of aircraft

Piston singles195 (87%)Piston twins30 (13%)

When the aircraft were built by decade

What the FAA has certified, ordered and been told about the Jacobs L4 /R755-7 the component layer

No FAA order in the current files names this engine series. Operators and repair shops have filed 16 failure reports with the FAA since 1995, 16 of them in the last ten years.

Failure reports 16 since · what operators and shops told the FAA

Parts most often reported as the reports name them

Hinge Bracket12Bracket2Brake Assy1Spar1

Latest reports

2006-01-04Brake Assy: corroded

2004-05-25Hinge Bracket: cracked

2004-05-25Hinge Bracket: corroded

Sources: the FAA's type certificate data sheets, airworthiness directives, supplemental type certificates, special conditions and special airworthiness information bulletins (Dynamic Regulatory System), and the FAA's service difficulty reports. A failure report is what an operator or repair station chose to file; the counts show reporting as much as reliability, and larger and commercial fleets report more. How the systems are grouped.

Connections how this engine series links to the rest of the register

Fitted to

Cessna 195 91 with this engine series
Cessna T-50 27 with this engine series
Waco YKS-7 18 with this engine series
Waco YKS-6 13 with this engine series
Beechcraft B17 5 with this engine series
Waco YQC-6 5 with this engine series
Beechcraft C17 5 with this engine series
Beechcraft E17 5 with this engine series

Where they are

Texas 22 of these aircraft
California 19 of these aircraft
Ohio 16 of these aircraft
Washington 14 of these aircraft
Illinois 10 of these aircraft

Biggest operators

Beechcraft Heritage Museum INC 4 of these aircraft
Port Townsend Aero Museum 3 of these aircraft
Mid Atlantic Air Museum 3 of these aircraft
Western Antique Aeroplane & Automobile Museum 2 of these aircraft

Airworthiness

Failure reports on the Jacobs L4 /R755-7 16 reports since 1995

Analytics

These connections as data: /graph/engine/jacobs-l4-r755-7.json · about the eFlight graph.

Aircraft newest certificates first · 225

Tail no.	Maker and model	Group	Owner and base	Certificate	Registered	Status
N17736	Waco YKS-7	Fixed-wing, single engine	Individual owner Nebraska	Standard	2018-08-10	Valid
N1TB	Cessna 195	Fixed-wing, single engine	R S Rowe Enterprises INC Sp Wilmington, Delaware	Standard	2018-07-26	Valid
N724E	Waco GXE	Fixed-wing, single engine	Individual owner Wisconsin	Standard	2018-07-09	Valid
N3458V	Cessna 195	Fixed-wing, single engine	Eastern Stearman INC Trustee Leesburg, Virginia	Standard	2018-05-15	Valid
N4329N	Cessna 195A	Fixed-wing, single engine	Co-owned owner Michigan	Standard	2018-02-14	Valid
N16208	Waco ZQC-6	Fixed-wing, single engine	Individual owner California	Standard	2018-01-04	Valid
N9858A	Cessna 195A	Fixed-wing, single engine	Co-owned owner California	Standard	2017-11-02	Valid
N1524D	Cessna 195A	Fixed-wing, single engine	Individual owner Georgia	Standard	2017-09-07	Valid
N17072	Beech C17L	Fixed-wing, single engine	Individual owner Ohio	Standard	2017-08-03	Valid
N1009D	Cessna 195A	Fixed-wing, single engine	Individual owner California	Standard	2017-07-05	Valid
N34214	Waco YKS-6	Fixed-wing, single engine	Waco Air Museum and Aviation Learning Center Troy, Ohio	Standard	2017-06-22	Valid
N92E	Fairchild 24W-9	Fixed-wing, single engine	Individual owner Oklahoma	Standard	2017-04-25	Valid
N51760	Cessna T-50	Fixed-wing, multi-engine	Military Aviation Museum Virginia Beach, Virginia	Standard	2017-03-22	Valid
N19373	Waco YKS-7	Fixed-wing, single engine	Individual owner Wisconsin	Standard	2017-02-10	Valid
N1571D	Cessna 195A	Fixed-wing, single engine	Individual owner New York	Standard	2016-11-30	Valid
N195AK	Cessna 195A	Fixed-wing, single engine	Individual owner Indiana	Standard	2016-11-29	Valid
N15232	Waco YKC-S	Fixed-wing, single engine	Individual owner Minnesota	Standard	2016-10-27	Valid
N369JJ	Cessna 195A	Fixed-wing, single engine	B&B Aviation LLC Evansville, Indiana	Standard	2016-09-01	Valid
N177W	Cessna 195A	Fixed-wing, single engine	Individual owner Illinois	Standard	2016-08-29	Valid
N19360	Waco ZGC-8	Fixed-wing, single engine	Individual owner Ohio	Standard	2016-08-22	Valid
N19467	Beech E17L	Fixed-wing, single engine	Beechcraft Heritage Museum INC Tullahoma, Tennessee	Standard	2016-08-17	Valid
N17734	Waco YKS-7	Fixed-wing, single engine	Individual owner New Hampshire	Standard	2016-07-15	Valid
N14000	Waco YKC	Fixed-wing, single engine	Individual owner California	Standard	2016-05-25	Valid
N1569D	Cessna 195	Fixed-wing, single engine	Plane Fun INC Tr Trustee Snellville, Georgia	Standard	2016-02-26	Valid
N1LE	Cessna 195A	Fixed-wing, single engine	Co-owned owner Missouri	Standard	2015-12-16	Valid
N19378	Waco AVN-8	Fixed-wing, single engine	Co-owned owner Illinois	Standard	2015-11-09	Valid
N60375	Boeing A75N1(PT17)	Fixed-wing, single engine	Individual owner North Carolina	Restricted	2015-09-23	Valid
N16517	Waco YKS-6	Fixed-wing, single engine	Individual owner Illinois	Standard	2015-09-01	Valid
N51838	Cessna T-50	Fixed-wing, multi-engine	Individual owner Texas	Standard	2015-07-27	Valid
N39716	Waco UPF-7	Fixed-wing, single engine	Co-owned owner Washington	Standard	2015-06-08	Valid
N47024	Beech C17B	Fixed-wing, single engine	Co-owned owner Pennsylvania	Standard	2015-04-22	Valid
N389M	Curtiss Wright TRAVEL AIR 4000	Fixed-wing, single engine	Individual owner Minnesota	Restricted	2015-01-22	Valid
N1075D	Cessna 195A	Fixed-wing, single engine	Individual owner Florida	Standard	2014-12-02	Valid
N1057D	Cessna 195A	Fixed-wing, single engine	Individual owner California	Standard	2014-11-03	Valid
N5934	Boeing E75	Fixed-wing, single engine	Heise Erick B Dexter, New York	Restricted	2014-06-18	Valid
N14080	Waco YMF-3	Fixed-wing, single engine	Command Aire LLC Sitka, Alaska	Standard	2014-04-08	Valid
N1092D	Cessna 195A	Fixed-wing, single engine	Manns Flying Service INC Lubbock, Texas	Standard	2014-04-02	Valid
N64410	Cessna T-50	Fixed-wing, multi-engine	Airpower Museum INC Ottumwa, Iowa	Standard	2014-03-11	Valid
N733	Cessna T-50	Fixed-wing, multi-engine	T J Air Service INC Middletown, Delaware	Standard	2014-01-28	Valid
N73580	Cessna T-50	Fixed-wing, multi-engine	T J Air Service INC Middletown, Delaware	Standard	2014-01-07	Valid
N195ST	Cessna 195A	Fixed-wing, single engine	Fly4Sport LLC Kasilof, Alaska	Standard	2013-10-31	Valid
N3067B	Cessna 195A	Fixed-wing, single engine	Individual owner Ohio	Standard	2013-09-04	Valid
N1082D	Cessna 195A	Fixed-wing, single engine	Individual owner Florida	Standard	2013-07-25	Valid
N15722	Waco YQC-6	Fixed-wing, single engine	Individual owner Ohio	Standard	2013-06-25	Valid
N9835A	Cessna 195A	Fixed-wing, single engine	Mcclain Aviation LLC Roanoke, Texas	Standard	2013-05-01	Valid
N195DK	Cessna 195A	Fixed-wing, single engine	Individual owner Arizona	Standard	2012-11-28	Valid
N44795	Cessna T-50	Fixed-wing, multi-engine	American Airpower Heritage Flying Museum Dallas, Texas	Standard	2012-10-01	Valid
N14066	Waco YKC-S	Fixed-wing, single engine	Alaska Aviation Museum Anchorage, Alaska	Standard	2012-07-09	Valid
N1261N	Cessna T-50	Fixed-wing, multi-engine	Individual owner Alaska	Standard	2012-05-21	Valid
N195JP	Cessna 195	Fixed-wing, single engine	Individual owner Delaware	Standard	2012-05-15	Valid
N195KS	Cessna 195A	Fixed-wing, single engine	Individual owner Pennsylvania	Standard	2012-05-11	Valid
N6443C	Cessna T-50	Fixed-wing, multi-engine	Big Sky Enterprises LLC Oregon City, Oregon	Standard	2011-12-30	Valid
N1541D	Cessna 195	Fixed-wing, single engine	Central Air Service INC Lewistown, Montana	Standard	2011-08-30	Valid
N17713	Waco YKS-7	Fixed-wing, single engine	San Diego Air & Space Museum INC San Diego, California	Standard	2011-06-28	Valid
N1129Z	Fairchild Funk M62C F-23A	Fixed-wing, single engine	Texas Air Museum Slaton, Texas	Experimental	2011-06-01	Valid
N16598	Waco YKS-6	Fixed-wing, single engine	Waco of Cross LLC Cross, South Carolina	Standard	2011-04-13	Valid
N17716	Waco YKS-7	Fixed-wing, single engine	Co-owned owner Illinois	Standard	2011-03-30	Valid
N9879A	Cessna 195A	Fixed-wing, single engine	Barron Aviation LLC Perry, Missouri	Standard	2011-02-24	Valid
N126JD	Cessna 195	Fixed-wing, single engine	Eastland Aviation INC Midland, Texas	Standard	2010-11-16	Valid
N9897A	Cessna 195A	Fixed-wing, single engine	Aero Garage INC Fort Myers, Florida	Standard	2010-05-21	Valid
N29371	Waco UKS-7	Fixed-wing, single engine	Gold Cap LLC Bremerton, Washington	Standard	2010-03-25	Valid
N17472	Waco YKS-7	Fixed-wing, single engine	Newport/Signal Air INC Signal Hill, California	Standard	2009-10-29	Valid
N16246	Waco YKS-6	Fixed-wing, single engine	Individual owner Ohio	Standard	2009-08-11	Valid
N17453	Waco YKS-7	Fixed-wing, single engine	Co-owned owner Minnesota	Standard	2009-07-22	Valid
N32077	Waco YPF-7	Fixed-wing, single engine	Memorial Aviation INC Fresno, Texas	Standard	2009-05-07	Valid
N29974	Waco UPF-7	Fixed-wing, single engine	C S Aviation LLC Fillmore, New York	Standard	2009-03-30	Valid
N16241	Waco YKS-6	Fixed-wing, single engine	Co-owned owner Florida	Standard	2008-04-25	Valid
N59188	Cessna T-50	Fixed-wing, multi-engine	Individual owner Minnesota	Standard	2008-04-25	Valid
N4474C	Cessna 195	Fixed-wing, single engine	Slipshod Aviation LLC Hurricane, Utah	Standard	2008-01-16	Valid
N58542	Cessna T-50	Fixed-wing, multi-engine	Western Antique Aeroplane & Automobile Museum Hood River, Oregon	Standard	2007-12-04	Valid
N14417	Beech B17L	Fixed-wing, single engine	Individual owner Kansas	Standard	2006-01-27	Valid
N14139	Waco YKC	Fixed-wing, single engine	Individual owner Ohio	Standard	2005-03-01	Valid
N48566	Boeing E75	Fixed-wing, single engine	Co-owned owner California	Standard	2005-02-17	Valid
N65554	Cessna UC-78B	Fixed-wing, multi-engine	Individual owner Ohio	Standard	2005-01-19	Valid
N1016D	Cessna 195A	Fixed-wing, single engine	Individual owner Texas	Standard	2005-01-13	Valid
N4434C	Cessna 195A	Fixed-wing, single engine	Individual owner Minnesota	Standard	2005-01-06	Valid
N19371	Waco YKS-7	Fixed-wing, single engine	Individual owner Ohio	None on file	2004-06-08	Valid
N4351V	Cessna 195	Fixed-wing, single engine	Individual owner Wisconsin	Standard	2004-01-08	Valid
N4312N	Cessna 195	Fixed-wing, single engine	Individual owner Missouri	Standard	2003-12-15	Valid
N21R	Waco CTO	Fixed-wing, single engine	Stuart Aviation Wilmington, Delaware	Standard	2003-10-23	Valid
N696Y	Grumman G-164	Fixed-wing, single engine	Individual owner New York	Restricted	2003-09-26	Valid
N19386	Waco YKS-7	Fixed-wing, single engine	Individual owner Virginia	Standard	2002-10-24	Valid
N268M	Waco ASO	Fixed-wing, single engine	Morozowsky John S Zanesville, Ohio	Restricted	2002-09-03	Valid
N4374V	Cessna 195A	Fixed-wing, single engine	Individual owner Georgia	Standard	2002-05-30	Valid
N4324N	Cessna 195A	Fixed-wing, single engine	Individual owner Washington	Standard	2002-05-28	Valid
N195KR	Cessna 195A	Fixed-wing, single engine	Individual owner Virginia	Standard	2002-02-28	Valid
N17471	Waco YKS-7	Fixed-wing, single engine	Gold Cap LLC Bremerton, Washington	Standard	2001-11-15	Valid
N12592	Beech B17L	Fixed-wing, single engine	Individual owner California	Standard	2001-08-22	Valid
N714E	Cessna 195A	Fixed-wing, single engine	Co-owned owner Montana	Standard	2000-10-11	Valid
N14409	Beech B17L	Fixed-wing, single engine	Beechcraft Heritage Museum INC Tullahoma, Tennessee	Standard	1999-07-02	Valid
N1074D	Cessna 195	Fixed-wing, single engine	Barron Aviation LLC Perry, Missouri	Standard	1998-08-04	Valid
N15211	Waco YOC	Fixed-wing, single engine	Co-owned owner Virginia	Standard	1998-01-26	Valid
N46617	Cessna T-50	Fixed-wing, multi-engine	Co-owned owner California	Standard	1996-08-06	Valid
N1068D	Cessna 195A	Fixed-wing, single engine	Individual owner North Carolina	Standard	1996-07-30	Valid
N4373N	Cessna 195	Fixed-wing, single engine	Individual owner Indiana	Standard	1996-05-15	Valid
N1559D	Cessna 195A	Fixed-wing, single engine	Individual owner New York	Standard	1995-02-09	Valid
N4336N	Cessna 195A	Fixed-wing, single engine	Individual owner Wisconsin	Standard	1993-11-03	Valid
N4998N	Boeing A75N1(PT17)	Fixed-wing, single engine	Individual owner Pennsylvania	Restricted	1993-03-25	Valid
N147AB	Fairchild 24W-41A	Fixed-wing, single engine	Individual owner Michigan	Standard	1992-11-25	Valid
N52703	Cessna T-50	Fixed-wing, multi-engine	Individual owner Michigan	Standard	1992-06-02	Valid

Source: FAA Civil Aviation Registry, Releasable Aircraft Database (the engine reference table and each aircraft's engine code), October 5, 2026. Horsepower and thrust are the FAA's figures for the series, not for a particular aircraft.