# Rotax 503ULDCDI - Type: Engine model (FAA registry) - Registry code: 55568 - Manufacturer (registry): ROTAX - Model: 503ULDCDI - Engine type: 2 cycle - Power: 52 hp - Installed in: 71 registered aircraft - Page: https://openairdocs.org/engine/rotax-503uldcdi 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 (71, first 50) - [N10091](https://openairdocs.org/aircraft/N10091): [Hendrickson Carl R](https://openairdocs.org/faa-owner/HENDRICKSON%20CARL%20R), [Alamogordo, NM](https://openairdocs.org/faa-place/NM/Alamogordo), built 2007, S/N CH2-0803-CW-2358 - [N105WZ](https://openairdocs.org/aircraft/N105WZ): [Morrison Malcolm B](https://openairdocs.org/faa-owner/MORRISON%20MALCOLM%20B), [The Villages, FL](https://openairdocs.org/faa-place/FL/The%20Villages), built 2016, S/N CH20499-1873 - [N111KP](https://openairdocs.org/aircraft/N111KP): [Karlovich James W](https://openairdocs.org/faa-owner/KARLOVICH%20JAMES%20W), [Kingston, GA](https://openairdocs.org/faa-place/GA/Kingston), built 2011, S/N 101 T 503 LSA - [N119ZX](https://openairdocs.org/aircraft/N119ZX): [Chester Darwin J](https://openairdocs.org/faa-owner/CHESTER%20DARWIN%20J), [Barnum, MN](https://openairdocs.org/faa-place/MN/Barnum), built 2008, S/N WS011108 - [N132RL](https://openairdocs.org/aircraft/N132RL): [Garner Lynn H](https://openairdocs.org/faa-owner/GARNER%20LYNN%20H), [El Paso, TX](https://openairdocs.org/faa-place/TX/El%20Paso), built 2023, S/N 112546LHG - [N142JD](https://openairdocs.org/aircraft/N142JD): [Wallace Joseph N](https://openairdocs.org/faa-owner/WALLACE%20JOSEPH%20N), [Alexander, ME](https://openairdocs.org/faa-place/ME/Alexander), built 2008, S/N CH2-0307-2788 - [N163RB](https://openairdocs.org/aircraft/N163RB): [Brot Richard](https://openairdocs.org/faa-owner/BROT%20RICHARD), [Parsippany, NJ](https://openairdocs.org/faa-place/NJ/Parsippany), built 2001, S/N 503-590 - [N1650L](https://openairdocs.org/aircraft/N1650L): [Garner Reginald D Jr](https://openairdocs.org/faa-owner/GARNER%20REGINALD%20D%20JR), [Rockmart, GA](https://openairdocs.org/faa-place/GA/Rockmart), S/N 0408 - [N1665H](https://openairdocs.org/aircraft/N1665H): [Ostolski Dennis R](https://openairdocs.org/faa-owner/OSTOLSKI%20DENNIS%20R), [Lake Worth, FL](https://openairdocs.org/faa-place/FL/Lake%20Worth), built 2007, S/N 01 - [N1668F](https://openairdocs.org/aircraft/N1668F): [Gorth Charles F](https://openairdocs.org/faa-owner/GORTH%20CHARLES%20F), [Greenfield, IN](https://openairdocs.org/faa-place/IN/Greenfield), built 2007, S/N 001 - [N200MP](https://openairdocs.org/aircraft/N200MP): [Smith Bruce Martin Trustee](https://openairdocs.org/faa-owner/SMITH%20BRUCE%20MARTIN%20TRUSTEE), [Spirit Lake, ID](https://openairdocs.org/faa-place/ID/Spirit%20Lake), built 2009, S/N 046 T 503 - [N2030L](https://openairdocs.org/aircraft/N2030L): [Hale Michael W](https://openairdocs.org/faa-owner/HALE%20MICHAEL%20W), [Port Orchard, WA](https://openairdocs.org/faa-place/WA/Port%20Orchard), built 1997, S/N FS534 - [N207JL](https://openairdocs.org/aircraft/N207JL): [Valderrama German E](https://openairdocs.org/faa-owner/VALDERRAMA%20GERMAN%20E), [Miami, FL](https://openairdocs.org/faa-place/FL/Miami), built 2003, S/N 05010933 - [N2089L](https://openairdocs.org/aircraft/N2089L): [Sell Charles F](https://openairdocs.org/faa-owner/SELL%20CHARLES%20F), [Chelsea, MI](https://openairdocs.org/faa-place/MI/Chelsea), built 1984, S/N 00134 - [N226PT](https://openairdocs.org/aircraft/N226PT): [Stoltzfus Mark T](https://openairdocs.org/faa-owner/STOLTZFUS%20MARK%20T), [Apple Creek, OH](https://openairdocs.org/faa-place/OH/Apple%20Creek), built 2015, S/N 140 T 503 LSA - [N2489H](https://openairdocs.org/aircraft/N2489H): [Parker James J](https://openairdocs.org/faa-owner/PARKER%20JAMES%20J), [Forest City, PA](https://openairdocs.org/faa-place/PA/Forest%20City), built 2008, S/N CH2-1005-CW-2682 - [N24900](https://openairdocs.org/aircraft/N24900): [Roberts William R](https://openairdocs.org/faa-owner/ROBERTS%20WILLIAM%20R), [Malaga, WA](https://openairdocs.org/faa-place/WA/Malaga), S/N 607WRR - [N2492L](https://openairdocs.org/aircraft/N2492L): [Combs Lawrence L](https://openairdocs.org/faa-owner/COMBS%20LAWRENCE%20L), [Gettysburg, PA](https://openairdocs.org/faa-place/PA/Gettysburg), built 1999, S/N 99-2358-SR5XP - [N2595E](https://openairdocs.org/aircraft/N2595E): [Azevedo Joseph G](https://openairdocs.org/faa-owner/AZEVEDO%20JOSEPH%20G), [Dixon, CA](https://openairdocs.org/faa-place/CA/Dixon), built 1990, S/N SPORT II 110 - [N2636R](https://openairdocs.org/aircraft/N2636R): [Dugan Phil](https://openairdocs.org/faa-owner/DUGAN%20PHIL), [Cleveland, TN](https://openairdocs.org/faa-place/TN/Cleveland), built 2008, S/N CH1003 2385 - [N27SD](https://openairdocs.org/aircraft/N27SD): [Lance Scott B](https://openairdocs.org/faa-owner/LANCE%20SCOTT%20B), [Winchester, CA](https://openairdocs.org/faa-place/CA/Winchester), built 2014, S/N 126 T 503 LSA - [N280RJ](https://openairdocs.org/aircraft/N280RJ): [Jones Douglas K](https://openairdocs.org/faa-owner/JONES%20DOUGLAS%20K), [Lipan, TX](https://openairdocs.org/faa-place/TX/Lipan), built 1994, S/N 09940518-1 - [N283A](https://openairdocs.org/aircraft/N283A): [Bristow Leonard B](https://openairdocs.org/faa-owner/BRISTOW%20LEONARD%20B), [Damar, KS](https://openairdocs.org/faa-place/KS/Damar), built 1998, S/N 04146 - [N294GL](https://openairdocs.org/aircraft/N294GL): [Langhans Gerhard P](https://openairdocs.org/faa-owner/LANGHANS%20GERHARD%20P), [Florence, KY](https://openairdocs.org/faa-place/KY/Florence), built 1984, S/N 600110 - [N297CX](https://openairdocs.org/aircraft/N297CX): [Gilmore Arnold R](https://openairdocs.org/faa-owner/GILMORE%20ARNOLD%20R), [Wauchula, FL](https://openairdocs.org/faa-place/FL/Wauchula), S/N 8941 - [N313TX](https://openairdocs.org/aircraft/N313TX): [Powers Jonathan G](https://openairdocs.org/faa-owner/POWERS%20JONATHAN%20G), [Tampa, FL](https://openairdocs.org/faa-place/FL/Tampa), built 2013, S/N CH11-0400-1964 - [N329TC](https://openairdocs.org/aircraft/N329TC): [Kerr Phillip D](https://openairdocs.org/faa-owner/KERR%20PHILLIP%20D), [Beebe, AR](https://openairdocs.org/faa-place/AR/Beebe), built 2004, S/N 001 - [N333DT](https://openairdocs.org/aircraft/N333DT): [Eva Travis T](https://openairdocs.org/faa-owner/EVA%20TRAVIS%20T), [Chester, ID](https://openairdocs.org/faa-place/ID/Chester), built 2007, S/N CH2-0803-2354 - [N3776A](https://openairdocs.org/aircraft/N3776A): [Sahagun Salvador G](https://openairdocs.org/faa-owner/SAHAGUN%20SALVADOR%20G), [Bothell, WA](https://openairdocs.org/faa-place/WA/Bothell), built 2000, S/N 001188 - [N3794S](https://openairdocs.org/aircraft/N3794S): [Knight Roger O.C.](https://openairdocs.org/faa-owner/KNIGHT%20ROGER%20O.C.), [Union Bridge, MD](https://openairdocs.org/faa-place/MD/Union%20Bridge), built 1999, S/N 51360 - [N393GX](https://openairdocs.org/aircraft/N393GX): [Amirkhanian Shahram C](https://openairdocs.org/faa-owner/AMIRKHANIAN%20SHAHRAM%20C), [Silver Spring, MD](https://openairdocs.org/faa-place/MD/Silver%20Spring), built 2010, S/N SCA001 - [N398HA](https://openairdocs.org/aircraft/N398HA): [Rocca John](https://openairdocs.org/faa-owner/ROCCA%20JOHN), [Box Elder, SD](https://openairdocs.org/faa-place/SD/Box%20Elder), S/N H-SSA-922-TD-503 - [N414HG](https://openairdocs.org/aircraft/N414HG): [Gross Robert L](https://openairdocs.org/faa-owner/GROSS%20ROBERT%20L), [Fort Lauderdale, FL](https://openairdocs.org/faa-place/FL/Fort%20Lauderdale), built 2009, S/N 047 T 503 - [N4158P](https://openairdocs.org/aircraft/N4158P): [Van Valzah Robert H](https://openairdocs.org/faa-owner/VAN%20VALZAH%20ROBERT%20H), [Richmond, NH](https://openairdocs.org/faa-place/NH/Richmond), S/N DMW-01 - [N415RH](https://openairdocs.org/aircraft/N415RH): [Christen Richard Paul](https://openairdocs.org/faa-owner/CHRISTEN%20RICHARD%20PAUL), [Bend, OR](https://openairdocs.org/faa-place/OR/Bend), built 2008, S/N 13010207 - [N43432](https://openairdocs.org/aircraft/N43432): [Richardson Eric Ib](https://openairdocs.org/faa-owner/RICHARDSON%20ERIC%20IB), [Charlotte, VT](https://openairdocs.org/faa-place/VT/Charlotte), built 2000, S/N A11AAC - [N438RN](https://openairdocs.org/aircraft/N438RN): [Durbin Randal L](https://openairdocs.org/faa-owner/DURBIN%20RANDAL%20L), [Overbrook, KS](https://openairdocs.org/faa-place/KS/Overbrook), built 2007, S/N CW 2677 - [N454K](https://openairdocs.org/aircraft/N454K): [Cousins Christopher M](https://openairdocs.org/faa-owner/COUSINS%20CHRISTOPHER%20M), [Waipahu, HI](https://openairdocs.org/faa-place/HI/Waipahu), built 2008, S/N FS01-2-00060 - [N456AB](https://openairdocs.org/aircraft/N456AB): [Brewer Andrew F](https://openairdocs.org/faa-owner/BREWER%20ANDREW%20F), [Rock Creek, OH](https://openairdocs.org/faa-place/OH/Rock%20Creek), built 1997, S/N 98-1836-2SR7 - [N456TR](https://openairdocs.org/aircraft/N456TR): [Robinson Ted](https://openairdocs.org/faa-owner/ROBINSON%20TED), [Tucson, AZ](https://openairdocs.org/faa-place/AZ/Tucson), built 1992, S/N 001 - [N4704J](https://openairdocs.org/aircraft/N4704J): [Jilek Bradley J](https://openairdocs.org/faa-owner/JILEK%20BRADLEY%20J), [Birchwood, WI](https://openairdocs.org/faa-place/WI/Birchwood), built 2006, S/N CH2-1005-2688 - [N4831A](https://openairdocs.org/aircraft/N4831A): [Mountain View, MO](https://openairdocs.org/faa-place/MO/Mountain%20View), S/N 102898, Sale reported - [N4KN](https://openairdocs.org/aircraft/N4KN): [Loken Halvar Y](https://openairdocs.org/faa-owner/LOKEN%20HALVAR%20Y), [Roseland, VA](https://openairdocs.org/faa-place/VA/Roseland), built 2007, S/N 016T 503 1107 - [N5010G](https://openairdocs.org/aircraft/N5010G): [Alligood Curtis E](https://openairdocs.org/faa-owner/ALLIGOOD%20CURTIS%20E), [Moultrie, GA](https://openairdocs.org/faa-place/GA/Moultrie), built 2006, S/N CH20501-2805 - [N505EJ](https://openairdocs.org/aircraft/N505EJ): [Akins Terral S](https://openairdocs.org/faa-owner/AKINS%20TERRAL%20S), [Grain Valley, MO](https://openairdocs.org/faa-place/MO/Grain%20Valley), built 2007, S/N A001 - [N5240](https://openairdocs.org/aircraft/N5240): [Nicholson Larry C](https://openairdocs.org/faa-owner/NICHOLSON%20LARRY%20C), [Calcutta, OH](https://openairdocs.org/faa-place/OH/Calcutta), built 1996, S/N CA-118F - [N532PV](https://openairdocs.org/aircraft/N532PV): [Weicken Zachary A](https://openairdocs.org/faa-owner/WEICKEN%20ZACHARY%20A), [Raymond, ME](https://openairdocs.org/faa-place/ME/Raymond), built 2004, S/N CH2-0401-2073 - [N5608M](https://openairdocs.org/aircraft/N5608M): [Woltanski Michael J](https://openairdocs.org/faa-owner/WOLTANSKI%20MICHAEL%20J), [Harrison Township, MI](https://openairdocs.org/faa-place/MI/Harrison%20Township), S/N 972677 - [N57058](https://openairdocs.org/aircraft/N57058): [Lemin Thomas F](https://openairdocs.org/faa-owner/LEMIN%20THOMAS%20F), [Claymont, DE](https://openairdocs.org/faa-place/DE/Claymont), built 1993, S/N 92-1026-2 - [N606VW](https://openairdocs.org/aircraft/N606VW): [Shages William V III](https://openairdocs.org/faa-owner/SHAGES%20WILLIAM%20V%20III), [Lake Geneva, WI](https://openairdocs.org/faa-place/WI/Lake%20Geneva), built 2010, S/N 606 All 71: https://openairdocs.org/engine/rotax-503uldcdi/aircraft.md ## NTSB investigations (10) From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. - [NTSB ERA26FA110](https://openairdocs.org/ntsb/ERA26FA110), Feb 9, 2026: Pipistrel Taurus 503 (N414HG), Boynton Beach, FL, substantial damage, investigation ongoing - [NTSB CEN25LA180](https://openairdocs.org/ntsb/CEN25LA180), May 18, 2025: Excalibur Excalibur (N4831A), Mountain View Airport, MO, substantial damage. Probable cause: An in-flight collision with a bird while enroute. - [NTSB CEN22LA127](https://openairdocs.org/ntsb/CEN22LA127), Feb 19, 2022: Quad City Challenger II (N438RN), Mountain Home, TX, substantial damage. Probable cause: The non-certificated pilot’s exceedance of the airplane’s critical angle of attack during the initial climb, which resulted in an aerodynamic stall and loss of airplane control at too low of an… - [NTSB ERA19TA114](https://openairdocs.org/ntsb/ERA19TA114), Mar 2, 2019: Rempe Kitfox (N93XL), Merritt Island, FL, substantial damage. Probable cause: The pilot's failure to maintain airplane control during an attempted go-around. - [NTSB WPR14LA233](https://openairdocs.org/ntsb/WPR14LA233), Jun 7, 2014: North Wing Apache Sport (N2804P), Polson, MT, destroyed, 1 fatal. Probable cause: The pilot’s loss of airplane control during initial climb due to his experiencing an incapacitating medical event. - [NTSB ERA13CA122](https://openairdocs.org/ntsb/ERA13CA122), Jan 29, 2013: Amirkhanian Shahram Charl Commander (N393GX), Westminster, MD, substantial damage. Probable cause: Impact with power lines due to the pilot’s obscured vision due to the low angle of the sun, which prevented the pilot from seeing the lines. - [NTSB WPR12LA214](https://openairdocs.org/ntsb/WPR12LA214), May 17, 2012: Marley Kolb Firestar II (N9173T), Cedar Fort, UT, substantial damage. Probable cause: The pilot's failure to maintain airplane control while on approach for landing in gusting wind conditions. - [NTSB NYC06LA129](https://openairdocs.org/ntsb/NYC06LA129), Jul 7, 2006: Chevrier, Armand J-3K (N43432), Charlotte, VT, substantial damage. Probable cause: A complete loss of engine power on takeoff for undetermined reasons, which resulted in a forced landing. - [NTSB LAX86LA327](https://openairdocs.org/ntsb/LAX86LA327), Aug 22, 1986: Cessna P210N (N4831A), Coalinga, CA, substantial damage - [NTSB MKC77FCQ04](https://openairdocs.org/ntsb/MKC77FCQ04), Nov 3, 1976: Piper PA-23 (N4158P), Wichita, KS, substantial damage ## FAA accident and incident reports (14) From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. - [Accident 20260209002799A](https://openairdocs.org/incident/20260209002799A), Feb 9, 2026: Pipistrel TAURUS 503 (N414HG), Boyton Beach, FL, Destroyed. On February 9, 2026, about 1514 eastern standard time, a Pipistrel taurus 503 motorglider, [privacy data omitted], was substantially damaged when it was… - [Incident 20250828011369I](https://openairdocs.org/incident/20250828011369I), Aug 28, 2025: Patterson John F CHALLENGER II (N2489H), Honesdale, PA, Minor damage. Aircraft departed runway 18 on cherry ridge airport (N30) after 10-15 minute taxi, warmup, and runup period. During climbout the engine suddenly stopped. Pilot… - [Accident 20250518005609A](https://openairdocs.org/incident/20250518005609A), May 18, 2025: Excalibur Aircraft EXCALIBUR (N4831A), Mountain View, MO, Substantial damage. An experimental light sport aircraft with one passenger was flying at approximately 1500 AGL. A large bird struck the RH MLG, causing it to separate from the… - [Accident 20230424004069A](https://openairdocs.org/incident/20230424004069A), Apr 24, 2023: Kolb FIRESTAR II (N454K), Enumclaw, WA, Substantial damage. Operator of aircraft was performing high-speed and slow taxi operations and had no intentions of becoming airborne. During high-speed taxi, the aircraft engine… - [Accident 20220219002199A](https://openairdocs.org/incident/20220219002199A), Feb 19, 2022: Quad City CHALLENGER II (N438RN), Mountain Home, TX, Substantial damage. Non-certificated pilot stated he took off and immediately set the aircraft back down. Then took off again and added flaps after rotation. The addition of flaps… - [Incident 20210907016759I](https://openairdocs.org/incident/20210907016759I), Sep 7, 2021: Herrick David A CHALLENGER II (N142JD), Princeton, ME, Minor damage. On 9/7/21 at 2142Z N142JD attempted a water landing in pocomoonshine lake with amphibious floats with the wheels extended. The aircraft flipped over after… - [Accident 20190302000769A](https://openairdocs.org/incident/20190302000769A), Mar 2, 2019: Rempe Paul W KITFOX XL4 (N93XL), Merritt Island, FL, Substantial damage. The aircraft was on final to runway 11, upon touching down the aircraft bounced and veered left. Full power was applied in an attempt to abort and go-around.… - [Incident 20170723023609I](https://openairdocs.org/incident/20170723023609I), Jul 23, 2017: Six Chuter SR2 (N4158P), Swanzey, NH, Minor damage. After taking off from a grass field, while climbing out and approaching trees at the field's edge, the aircraft engine failed. The pilot began to turn left and… - [Accident 20140607007459A](https://openairdocs.org/incident/20140607007459A), Jun 7, 2014: Northwing APACHE SPORT (N2804P), Polson, MT, Destroyed, 1 fatal. PIC installed a wing that was not recommended by the LSA manufacturer. During test flight at approximately 150 ? 200 AGL, PIC entered a steep left turn and… - [Accident 20130129000639A](https://openairdocs.org/incident/20130129000639A), Jan 29, 2013: Amirkhanian Shahram Charl COMMANDER (N393GX), Westminster, MD, Destroyed. Pilot was practicing turns over an open field. As he came around the turn the sun came out from behind the clouds and the pilot could not see forward and flew… - [Accident 20120517007999A](https://openairdocs.org/incident/20120517007999A), May 17, 2012: Marley Thomas Jay KOLB FIRESTAR II (N9173T), Cedar Fort, UT, Substantial damage. On approach to land at Cedar Valley Airport, the pilot was attempting to land in very high winds with strong gusts for this light aircraft. He lost control and… - [Incident 20090815015739I](https://openairdocs.org/incident/20090815015739I), Aug 15, 2009: Amtr FIRESTARII (N454K), Kapolei, HI, Minor damage. (-23) Owner plans to replace all clevis pins with standard "nas" or "an" hardware (bolts nuts & cotter pins) on wing & complete an SDR report. - [Accident 20060707022199A](https://openairdocs.org/incident/20060707022199A), Jul 7, 2006: Amtr J3KITTEN (N43432), Charlotte, VT, Substantial damage. (-23) Pilot was operating from a grass strip in Charlotte, VT. Aircraft engine stopped during climbout at approximately 50 feet AGL resulting in a forced… - [Accident 19761103035289A](https://openairdocs.org/incident/19761103035289A), Nov 3, 1976: Piper PA23160 (N4158P), Wichita, KS, Substantial damage. Cabin door came open causing buffet. Feathered right engine-undershot runway on single engine apch. --- 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.