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
N88878	Cessna T-50	Fixed-wing, multi-engine	Co-owned owner Texas	Standard	2026-09-23	Valid
N15720	Waco YKS-6	Fixed-wing, single engine	Cal-Aerofab Flight Academy Chino, California	Standard	2026-08-05	Valid
N9395A	Cessna 195A	Fixed-wing, single engine	Rothacker Aviation LLC Chester Springs, Pennsylvania	Standard	2026-06-29	Valid
N1001D	Cessna 195A	Fixed-wing, single engine	Spartan National Holdings LLC Missoula, Montana	Standard	2026-05-30	Valid
N53378	Cessna T-50	Fixed-wing, multi-engine	Mid Atlantic Air Museum Reading, Pennsylvania	Standard	2026-05-22	Valid
N2896D	Waco YKS-7	Fixed-wing, single engine	Port Townsend Aero Museum Port Townsend, Washington	Standard	2026-04-16	Valid
N16508	Waco YKS-6	Fixed-wing, single engine	Individual owner Georgia	Standard	2026-03-19	Valid
N16512	Waco YKS-6	Fixed-wing, single engine	Southern Aircraft Consultancy INC Trustee Casper, Wyoming	Standard	2026-02-11	Valid
N1567D	Cessna 195A	Fixed-wing, single engine	Qualitair LLC Trustee Michelstadt,	Standard	2026-01-22	Valid
N4263S	Fairchild 24W-46	Fixed-wing, single engine	Individual owner Tennessee	Standard	2026-01-16	Valid
N9885A	Cessna 195B	Fixed-wing, single engine	Pmc Aviation LLC Payson, Arizona	Standard	2025-12-09	Valid
N9871A	Cessna 195A	Fixed-wing, single engine	Withheld at owner's request	Standard	2025-11-15	Valid
N69072	Cessna T-50	Fixed-wing, multi-engine	Someday Flight Foundation Lockhart, Texas	Standard	2025-11-07	Valid
N1013D	Cessna 195A	Fixed-wing, single engine	Individual owner Florida	Standard	2025-09-30	Valid
N17737	Waco YKS-7	Fixed-wing, single engine	Individual owner Michigan	Standard	2025-09-24	Valid
N653H	Curtiss Wright TRAVEL AIR 4000	Fixed-wing, single engine	Individual owner Kansas	Restricted	2025-09-13	Valid
N195DY	Cessna 195A	Fixed-wing, single engine	Co-owned owner New York	Standard	2025-08-06	Valid
N4358V	Cessna 195	Fixed-wing, single engine	Co-owned owner Michigan	Standard	2025-06-30	Valid
N5573N	Boeing B75N1	Fixed-wing, single engine	Co-owned owner Wisconsin	Standard	2025-05-08	Valid
N16205	Waco YQC-6	Fixed-wing, single engine	Port Townsend Aero Museum Port Townsend, Washington	Standard	2025-04-01	Valid
N30F	Cessna T-50	Fixed-wing, multi-engine	Individual owner California	Standard	2025-03-27	Valid
N9389A	Cessna 195A	Fixed-wing, single engine	Individual owner Colorado	Standard	2025-03-19	Valid
N5268N	Boeing E75	Fixed-wing, single engine	Individual owner Maryland	Standard	2025-01-25	Valid
N16249	Waco YKS-6	Fixed-wing, single engine	Individual owner Tennessee	Standard	2024-12-10	Valid
N16507	Waco YKS-6	Fixed-wing, single engine	Individual owner Ohio	Standard	2024-12-06	Valid
N17473	Waco YKS-7	Fixed-wing, single engine	Individual owner New Hampshire	Standard	2024-11-20	Valid
N1056D	Cessna 195A	Fixed-wing, single engine	Smooth Landings LLC Magee, Mississippi	Standard	2024-10-23	Valid
N3083B	Cessna 195A	Fixed-wing, single engine	Individual owner South Carolina	Standard	2024-08-20	Valid
N84AP	Peterson Al W STARDUSTER SA-300	Fixed-wing, single engine	Oklahoma Warbird Aviation LLC Oklahoma City, Oklahoma	Experimental	2024-07-25	Valid
N195FY	Cessna 195A	Fixed-wing, single engine	Individual owner North Carolina	Standard	2024-06-14	Valid
N16212	Waco YQC-6	Fixed-wing, single engine	Withheld at owner's request	Standard	2024-06-07	Valid
N4323N	Cessna 195A	Fixed-wing, single engine	Co-owned owner California	Standard	2024-05-01	Valid
N168V	Curtiss Wright TRAVEL AIR 4000	Fixed-wing, single engine	Individual owner California	Restricted	2024-04-18	Valid
N47155	Cessna T-50	Fixed-wing, multi-engine	Individual owner Florida	Standard	2024-03-04	Valid
N284Y	Beech E17L	Fixed-wing, single engine	Co-owned owner Texas	Standard	2024-02-08	Valid
N195EL	Cessna 195A	Fixed-wing, single engine	Individual owner Georgia	Standard	2023-12-26	Valid
N4352V	Cessna 195	Fixed-wing, single engine	Co-owned owner Georgia	Standard	2023-11-08	Valid
N195P	Cessna 190	Fixed-wing, single engine	Diamond B Farms Trucking INC Gamaliel, Kentucky	Standard	2023-10-19	Valid
N14134	Waco YMF	Fixed-wing, single engine	Dream Waco LLC Oklahoma City, Oklahoma	None on file	2023-09-19	Valid
N16576	Waco YKS-6	Fixed-wing, single engine	Dream Waco LLC Oklahoma City, Oklahoma	Standard	2023-09-14	Valid
N1010D	Cessna 195A	Fixed-wing, single engine	Individual owner Arizona	Standard	2023-08-18	Valid
N1528D	Cessna 195A	Fixed-wing, single engine	Individual owner Utah	Standard	2023-08-06	Valid
N53664	Cessna T-50	Fixed-wing, multi-engine	Mid Atlantic Air Museum Reading, Pennsylvania	Standard	2023-08-03	Valid
N1514D	Cessna 195A	Fixed-wing, single engine	Port Townsend Aero Museum Port Townsend, Washington	Standard	2023-07-25	Valid
N1560D	Cessna 195A	Fixed-wing, single engine	Co-owned owner Idaho	Standard	2023-07-01	Valid
N195HJ	Cessna 195B	Fixed-wing, single engine	Individual owner Ohio	Standard	2023-06-12	Valid
N14015	Waco UKC	Fixed-wing, single engine	Co-owned owner Washington	Standard	2023-05-05	Valid
N9353A	Cessna 195	Fixed-wing, single engine	Individual owner Arizona	Standard	2023-05-05	Valid
N1032D	Cessna 195A	Fixed-wing, single engine	Individual owner Texas	Standard	2023-04-23	Valid
N3451V	Cessna 195A	Fixed-wing, single engine	Individual owner Mississippi	Standard	2023-04-03	Valid
N4327V	Cessna 195	Fixed-wing, single engine	Individual owner Mississippi	Standard	2023-03-28	Valid
N1238N	Cessna T-50	Fixed-wing, multi-engine	Individual owner Pennsylvania	Standard	2023-03-21	Valid
N195WG	Cessna 195	Fixed-wing, single engine	Fisher Group LLC Ashland City, Tennessee	Standard	2023-03-09	Valid
N14027	Waco YKC	Fixed-wing, single engine	Individual owner Ohio	Standard	2023-03-01	Valid
N17071	Beech E17L	Fixed-wing, single engine	Co-owned owner Pennsylvania	Standard	2023-02-22	Valid
N1071D	Cessna 195A	Fixed-wing, single engine	Western Antique Aeroplane & Automobile Museum Hood River, Oregon	Standard	2023-01-24	Valid
N14087	Waco YKC	Fixed-wing, single engine	Co-owned owner Washington	Standard	2023-01-19	Valid
N15705	Waco YQC-6	Fixed-wing, single engine	Waco 705 LLC Fredericksburg, Texas	Standard	2023-01-18	Valid
N14128	Waco YMF	Fixed-wing, single engine	Individual owner Texas	Standard	2023-01-05	Valid
N195RK	Cessna 195	Fixed-wing, single engine	Individual owner Illinois	Standard	2022-12-01	Valid
N91H	Beech E17B	Fixed-wing, single engine	Individual owner Tennessee	Standard	2022-12-01	Valid
N1054D	Cessna 195A	Fixed-wing, single engine	Co-owned owner Washington	Standard	2022-06-17	Valid
N60453	Cessna T-50	Fixed-wing, multi-engine	Plane Fun INC Tr Trustee Snellville, Georgia	Standard	2022-06-14	Valid
N4328V	Cessna 195A	Fixed-wing, single engine	Lumcavok Aviation 1 INC Middletown, Delaware	None on file	2022-05-14	Valid
N3491V	Cessna 195	Fixed-wing, single engine	Individual owner California	Standard	2022-03-25	Valid
N9847A	Cessna 195A	Fixed-wing, single engine	Co-owned owner Delaware	Standard	2022-02-18	Valid
N17064	Beech C17L	Fixed-wing, single engine	Individual owner Missouri	Multiple	2022-01-20	Valid
N195RJ	Cessna 195A	Fixed-wing, single engine	Individual owner Washington	Standard	2021-11-04	Valid
N12590	Beech B17L	Fixed-wing, single engine	Individual owner California	Standard	2021-07-01	Valid
N552Y	Grumman G-164	Fixed-wing, single engine	Farm AG Enterprises LLC Buckeye, Arizona	Restricted	2021-05-13	Valid
N195RS	Cessna 195A	Fixed-wing, single engine	International Air Services INC Trustee Carson City, Nevada	Standard	2021-05-10	Valid
N1053D	Cessna 195A	Fixed-wing, single engine	Individual owner Texas	Standard	2021-05-08	Valid
N18785	Beech E17L	Fixed-wing, single engine	Sky West Aviation INC Trustee Albuquerque, New Mexico	Standard	2021-03-22	Valid
N17470	Waco ZPF-6	Fixed-wing, single engine	Old Style Aircraft LLC Ellsinore, Missouri	Standard	2020-11-17	Valid
N672	Cessna T-50	Fixed-wing, multi-engine	Individual owner Ohio	Standard	2020-10-24	Valid
N645Y	Grumman G-164	Fixed-wing, single engine	Individual owner Maryland	Restricted	2020-10-07	Valid
N3462V	Cessna 195A	Fixed-wing, single engine	Individual owner Tennessee	Standard	2020-08-20	Valid
N15846	Beech C17L	Fixed-wing, single engine	Sullivan Michael A Reno, Nevada	Standard	2020-08-18	Valid
N17464	Waco YKS-7	Fixed-wing, single engine	Consolidated Aero LLC Gibsonville, North Carolina	Standard	2020-07-09	Valid
N4380N	Cessna 195	Fixed-wing, single engine	Individual owner Florida	Standard	2020-05-26	Valid
N66671	Cessna T-50	Fixed-wing, multi-engine	National Wasp Wwii Museum INC Sweetwater, Texas	Standard	2020-03-31	Valid
N29370	Waco YKS-7	Fixed-wing, single engine	Co-owned owner Florida	Standard	2020-03-16	Valid
N60010	Cessna T-50	Fixed-wing, multi-engine	Individual owner Massachusetts	Standard	2020-02-26	Valid
N52960	Fairchild 24W-9	Fixed-wing, single engine	Individual owner Oklahoma	Standard	2020-02-21	Valid
N15244	Waco YOC	Fixed-wing, single engine	Individual owner Alabama	Standard	2020-01-03	Valid
N12589	Beech B17L	Fixed-wing, single engine	Individual owner Colorado	Standard	2019-12-20	Valid
N6HS	Cessna T-50	Fixed-wing, multi-engine	Collings Foundation INC DBA Hudson, Massachusetts	Standard	2019-12-12	Valid
N14620	Waco YKC-S	Fixed-wing, single engine	Koerner Aviation INC Kankakee, Illinois	Standard	2019-11-19	Valid
N3443V	Cessna 195	Fixed-wing, single engine	Individual owner Michigan	Standard	2019-11-12	Valid
N9833A	Cessna 195B	Fixed-wing, single engine	Individual owner Virginia	Standard	2019-10-30	Valid
N9859A	Cessna 195A	Fixed-wing, single engine	Individual owner Alabama	Standard	2019-09-23	Valid
N195CK	Cessna 195A	Fixed-wing, single engine	Individual owner Minnesota	Standard	2019-08-05	Valid
N51469	Cessna T-50	Fixed-wing, multi-engine	Portland City Temple INC Oregon City, Oregon	Standard	2019-05-21	Valid
N4332V	Cessna 195	Fixed-wing, single engine	Co-owned owner Illinois	Standard	2019-04-18	Valid
N1518D	Cessna 195A	Fixed-wing, single engine	Individual owner Missouri	Standard	2019-04-08	Valid
N16211	Waco YKS-6	Fixed-wing, single engine	Individual owner Washington	Standard	2019-02-25	Valid
N122BH	Boeing D75N1	Fixed-wing, single engine	Individual owner Texas	Restricted	2019-01-24	Valid
N56009	Cessna UC-78	Fixed-wing, multi-engine	Individual owner New York	Standard	2019-01-08	Valid
N17474	Waco YKS-7	Fixed-wing, single engine	Individual owner Illinois	Standard	2018-09-07	Valid
N1937	Waco YKS-7	Fixed-wing, single engine	Individual owner California	Standard	2018-08-22	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.