# Jacobs L-4 - Type: Engine model (FAA registry) - Registry code: 35026 - Manufacturer (registry): JACOBS - Model: L-4 - Engine type: Reciprocating - Power: 245 hp - Data sheet: [TCDS TC 121](https://openairdocs.org/tcds/TC%20121) (OpenAirDocs) - Holder: Air Repair Inc. - Installed in: 0 registered aircraft - Page: https://openairdocs.org/engine/jacobs-l-4 Model codes come from the FAA registry's reference file. ## ADs that may apply (OpenAirDocs) Matched to this engine model by model name and maker. Each AD's applicability may narrow it by serial number, part number or equipment. None matched. ## Registered aircraft None registered with this engine model now. ## NTSB investigations None matched to aircraft with this engine model. ## FAA accident and incident reports None matched to aircraft with this engine model. ## Service difficulty reports (16) As reported by operators and repair stations, by the model named in the report. - [SDR 2006FA0000021](https://openairdocs.org/sdr/2006FA0000021), Jan 4, 2006: BRAKE ASSY. CORRODED. DISASSEMBLED BRAKE AND FOUND THAT THE BRAKE CYLINDER WAS CORRODED FROM WHERE THE O-RING MAKES A SEAL TO THE IB STOP. THE O-RING WAS HARD AND HAD TAKEN A SET. MF - [SDR 2004FA0000435](https://openairdocs.org/sdr/2004FA0000435), May 25, 2004: HINGE BRACKET. CRACKED. INSPECTED ORIGINAL MAGNESIUM IB AILERON HINGE BRACKETS AND FOUND SOME OR ALL OF THE FOLLOWING CONDITIONS: SEVERELY CORRODED BRACKET BODY AROUND MOUNT AND BEARIN - [SDR 2004FA0000460](https://openairdocs.org/sdr/2004FA0000460), May 25, 2004: HINGE BRACKET. CRACKED. INSPECTED ORIGINAL MAGNESIUM IB AILERON HINGE BRACKEST AND FOUND SOME OR ALL OF THE FOLLOWING CONDITIONS: SEVERELY CORRODED BRACKET BODY AROUND MOUNT AND BEARIN - [SDR 2004FA0000463](https://openairdocs.org/sdr/2004FA0000463), May 25, 2004: HINGE BRACKET. CRACKED. INSPECTED ORIGINAL MAGNESIUM IB AILERON HINGE BRACKETS AND FOUND SOME OR ALL OF THE FOLLOWING CONDITIONS: SEVERELY CORRODED BRACKET BODY AROUND MOUNT AND BEARIN - [SDR 2004FA0000468](https://openairdocs.org/sdr/2004FA0000468), May 25, 2004: HINGE BRACKET. CORRODED. INSPECTED ORIGINAL MAGNESIUM IB AILERON HINGE BRACKETS AND FOUND SOME OR ALL OF THE FOLLOWING CONDITIONS: SEVERELY CORRODED BRACKET BODY AROUND MOUNT AND BEARIN - [SDR 2004FA0000480](https://openairdocs.org/sdr/2004FA0000480), May 25, 2004: HINGE BRACKET. CORRODED. INSPECTED ORIGINAL MAGNESIUM IB AILERON HINGE BRACKETS AND FOUND SOME OR ALL OF THE FOLLOWING CONDITIONS: SEVERELY CORRODED BRACKET BODY AROUND MOUNT AND BEARIN - [SDR 2004FA0000483](https://openairdocs.org/sdr/2004FA0000483), May 25, 2004: HINGE BRACKET. CORRODED. INSPECTED ORIGINAL MAGNESIUM IB AILERON HINGE BRACKETS AND FOUND SOME OR ALL OF THE FOLLOWING CONDITIONS: SEVERELY CORRODED BRACKET BODY AROUND MOUNT AND BEARIN - [SDR 2004FA0000491](https://openairdocs.org/sdr/2004FA0000491), May 25, 2004: HINGE BRACKET. CORRODED. INSPECTED ORIGINAL MAGNESIUM IB AILERON HINGE BRACKETS AND FOUND SOME OR ALL OF THE FOLLOWING CONDITIONS: SEVERELY CORRODED BRACKET BODY AROUND MOUNT AND BEARIN - [SDR 2004FA0000494](https://openairdocs.org/sdr/2004FA0000494), May 25, 2004: HINGE BRACKET. CORRODED. INSPECTED ORIGINAL MAGNESIUM IB AILERON HINGE BRACKETS AND FOUND SOME OR ALL OF THE FOLLOWING CONDITIONS: SEVERELY CORRODED BRACKET BODY AROUND MOUNT AND BEARIN - [SDR 2004FA0000500](https://openairdocs.org/sdr/2004FA0000500), May 25, 2004: HINGE BRACKET. CORRODED. INSPECTED ORIGINAL MAGNESIUM IB AILERON HINGE BRACKETS AND FOUND SOME OR ALL OF THE FOLLOWING CONDITIONS: SEVERELY CORRODED BRACKET BODY AROUND MOUNT AND BEARIN - [SDR 2004FA0000501](https://openairdocs.org/sdr/2004FA0000501), May 25, 2004: HINGE BRACKET. CORRODED. INSPECTED ORIGINAL MAGNESIUM IB AILERON HINGE BRACKETS AND FOUND SOME OR ALL OF THE FOLLOWING CONDITIONS: SEVERELY CORRODED BRACKET BODY AROUND MOUNT AND BEARIN - [SDR 2004FA0000502](https://openairdocs.org/sdr/2004FA0000502), May 25, 2004: HINGE BRACKET. CORRODED. INSPECTED ORIGINAL MAGNESIUM IB AILERON HINGE BRACKETS AND FOUND SOME OR ALL OF THE FOLLOWING CONDITIONS: SEVERELY CORRODED BRACKET BODY AROUND MOUNT AND BEARIN - [SDR 2004FA0000506](https://openairdocs.org/sdr/2004FA0000506), May 25, 2004: HINGE BRACKET. CORRODED. INSPECTED ORIGINAL MAGNESIUM IB AILERON HINGE BRACKETS AND FOUND SOME OR ALL OF THE FOLLOWING CONDITIONS: SEVERELY CORRODED BRACKET BODY AROUND MOUNT AND BEARIN - [SDR DEM2002F00007](https://openairdocs.org/sdr/DEM2002F00007), Jun 1, 2002: SPAR. CRACKED. BOTH ELEVATOR SPARS CRACKED VERTICALLY INITIATING IN BEND RADIUS OF FLANGE TO MOUNT TIP RIB. - [SDR 2002FA0000212](https://openairdocs.org/sdr/2002FA0000212), Dec 26, 2001: BRACKET. CORRODED. BOTH BRACKETS CRACKED ALL THE WAY ACROSS BEARING BOSS, SEVERELY CORRODED AND MOUNTING LEG OF ONE BRACKET BROKEN OFF. THE PROBLEM WITH THESE BRACKETS IS THE HIGH - [SDR 2002FA0000213](https://openairdocs.org/sdr/2002FA0000213), Dec 26, 2001: BRACKET. CRACKED. BOTH BRACKETS CRACKED ALL THE WAY ACROSS BEARING BOSS, SEVERLY CORRODED AND MOUNTING LEG OF ONE BRACKET BROKEN OFF. THE PROBLEM WITH THESE BRACKETS IS THE HIGHL ## STCs that may be installed (OpenAirDocs) (5) Approved for this engine model: the STC's model list names it on its data sheet, or a series that includes it. In force first, then newest. The registry doesn't record which STCs an aircraft has. - [STC SE04136AT](https://openairdocs.org/stc/SE04136AT): Installation of Bendix Scintilla WL-7A Battery Ignition Timer (distributor) modified from a breaker points and condenser design to a Hall Effect electronic sensor design. Air Repair Inc - [STC SE00809WI](https://openairdocs.org/stc/SE00809WI): Installation of a modified alternate source of supply, engine ignition coil assembly and condenser. Air Repair Inc - [STC SE01652WI](https://openairdocs.org/stc/SE01652WI): Modification of engine to replace contact points and condenser controlled Bendix Scintilla WL-7A battery timer (distributor) with an electronically controlled WL-7A-M battery timer. Radial Engines Ltd - [STC SA4005NM](https://openairdocs.org/stc/SA4005NM): Precise Flight Inc. Pulselite Control System. Precise Flight Inc - [STC SE01243WI](https://openairdocs.org/stc/SE01243WI): Installation of Barron Aviation intake tube drain kits on the engines listed on the attached FAA Approved Model List (AML) No. SE01243WI, dated April 26, 2004, or later FAA Approved revision. Barron Aviation --- 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.