# Rotax 503UL

- Type: Engine model (FAA registry)
- Registry code: 55565
- Manufacturer (registry): ROTAX
- Model: 503UL
- Engine type: 2 cycle
- Power: 52 hp
- Installed in: 24 registered aircraft
- Page: https://openairdocs.org/engine/rotax-503ul

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 (24)

- [N107SM](https://openairdocs.org/aircraft/N107SM): [Dierker Robert R](https://openairdocs.org/faa-owner/DIERKER%20ROBERT%20R), [Chestertown, MD](https://openairdocs.org/faa-place/MD/Chestertown), built 2006, S/N 14010906
- [N165ZX](https://openairdocs.org/aircraft/N165ZX): [Wingfield Larry T](https://openairdocs.org/faa-owner/WINGFIELD%20LARRY%20T), [North Lewisburg, OH](https://openairdocs.org/faa-place/OH/North%20Lewisburg), built 2001, S/N 000515
- [N168RC](https://openairdocs.org/aircraft/N168RC): [Cudaback Jack L](https://openairdocs.org/faa-owner/CUDABACK%20JACK%20L), [Omaha, NE](https://openairdocs.org/faa-place/NE/Omaha), built 1999, S/N 98267
- [N17XD](https://openairdocs.org/aircraft/N17XD): [Rollins David M](https://openairdocs.org/faa-owner/ROLLINS%20DAVID%20M), [Martinsville, IN](https://openairdocs.org/faa-place/IN/Martinsville), built 1999, S/N 7357
- [N2097K](https://openairdocs.org/aircraft/N2097K): [Thompson Gregory G](https://openairdocs.org/faa-owner/THOMPSON%20GREGORY%20G), [Denison, TX](https://openairdocs.org/faa-place/TX/Denison), built 2005, S/N WA 1115
- [N2657E](https://openairdocs.org/aircraft/N2657E): [Leone Marc J](https://openairdocs.org/faa-owner/LEONE%20MARC%20J), [Wofford Heights, CA](https://openairdocs.org/faa-place/CA/Wofford%20Heights), S/N 44218
- [N2672A](https://openairdocs.org/aircraft/N2672A): [Crowe Brian T](https://openairdocs.org/faa-owner/CROWE%20BRIAN%20T), [Saunemin, IL](https://openairdocs.org/faa-place/IL/Saunemin), built 2007, S/N 0812
- [N3165W](https://openairdocs.org/aircraft/N3165W): [Bell Charles W Jr](https://openairdocs.org/faa-owner/BELL%20CHARLES%20W%20JR), [Edison, NJ](https://openairdocs.org/faa-place/NJ/Edison), built 1997, S/N A10CWB
- [N333RC](https://openairdocs.org/aircraft/N333RC): [Puckett Eugene A](https://openairdocs.org/faa-owner/PUCKETT%20EUGENE%20A), [Phoenix, AZ](https://openairdocs.org/faa-place/AZ/Phoenix), built 2007, S/N T92503COHK0035
- [N368MP](https://openairdocs.org/aircraft/N368MP): [Andreotta Robert M](https://openairdocs.org/faa-owner/ANDREOTTA%20ROBERT%20M), [Fulton, NY](https://openairdocs.org/faa-place/NY/Fulton), built 2009, S/N CH2-0407-LSS-0127
- [N3840G](https://openairdocs.org/aircraft/N3840G): [Little Keene H](https://openairdocs.org/faa-owner/LITTLE%20KEENE%20H), [Sandpoint, ID](https://openairdocs.org/faa-place/ID/Sandpoint), built 2009, S/N CH2-1005-2691
- [N42CE](https://openairdocs.org/aircraft/N42CE): [Erickson Clarence B III](https://openairdocs.org/faa-owner/ERICKSON%20CLARENCE%20B%20III), [Shreveport, LA](https://openairdocs.org/faa-place/LA/Shreveport), built 2007, S/N 019T 503 1007
- [N4473G](https://openairdocs.org/aircraft/N4473G): [Allen Jeffery E](https://openairdocs.org/faa-owner/ALLEN%20JEFFERY%20E), [Jacksonville, FL](https://openairdocs.org/faa-place/FL/Jacksonville), built 2003, S/N 1400
- [N4854K](https://openairdocs.org/aircraft/N4854K): [Doughty Stuart R](https://openairdocs.org/faa-owner/DOUGHTY%20STUART%20R), [Fayetteville, AR](https://openairdocs.org/faa-place/AR/Fayetteville), built 2005, S/N CH206032327
- [N5025V](https://openairdocs.org/aircraft/N5025V): [Bush Bryan P](https://openairdocs.org/faa-owner/BUSH%20BRYAN%20P), [Cleghorn, IA](https://openairdocs.org/faa-place/IA/Cleghorn), built 2008, S/N 1-2564
- [N503WT](https://openairdocs.org/aircraft/N503WT): [Wilson John Burttrum III](https://openairdocs.org/faa-owner/WILSON%20JOHN%20BURTTRUM%20III), [Round Rock, TX](https://openairdocs.org/faa-place/TX/Round%20Rock), built 2006, S/N 503:1055
- [N546FL](https://openairdocs.org/aircraft/N546FL): [Beckens Scott A](https://openairdocs.org/faa-owner/BECKENS%20SCOTT%20A), [Sodus, NY](https://openairdocs.org/faa-place/NY/Sodus), built 2002, S/N 2002 100FC
- [N61086](https://openairdocs.org/aircraft/N61086): [Rateau Claude](https://openairdocs.org/faa-owner/RATEAU%20CLAUDE), [Santa Maria, CA](https://openairdocs.org/faa-place/CA/Santa%20Maria), built 1998, S/N CH2-0796-1509
- [N702KW](https://openairdocs.org/aircraft/N702KW): [Welch William R](https://openairdocs.org/faa-owner/WELCH%20WILLIAM%20R), [Navajo Dam, NM](https://openairdocs.org/faa-place/NM/Navajo%20Dam), built 2014, S/N 01
- [N702SW](https://openairdocs.org/aircraft/N702SW): [Frost Charles R](https://openairdocs.org/faa-owner/FROST%20CHARLES%20R), [Mina, NV](https://openairdocs.org/faa-place/NV/Mina), built 1992, S/N SPRINT II 345
- [N9066J](https://openairdocs.org/aircraft/N9066J): [Graham Jr Richard A](https://openairdocs.org/faa-owner/GRAHAM%20JR%20RICHARD%20A), [Colorado Springs, CO](https://openairdocs.org/faa-place/CO/Colorado%20Springs), built 2002, S/N T02053
- [N9113T](https://openairdocs.org/aircraft/N9113T): [Kinsinger Jason Jay](https://openairdocs.org/faa-owner/KINSINGER%20JASON%20JAY), [Oakland, MD](https://openairdocs.org/faa-place/MD/Oakland), S/N 0105-CW-0795
- [N9146Z](https://openairdocs.org/aircraft/N9146Z): [Cauvin John R](https://openairdocs.org/faa-owner/CAUVIN%20JOHN%20R), [Carefree, AZ](https://openairdocs.org/faa-place/AZ/Carefree), built 2004, S/N T04033
- [N923KP](https://openairdocs.org/aircraft/N923KP): [Porter Kerry](https://openairdocs.org/faa-owner/PORTER%20KERRY), [Oakley, CA](https://openairdocs.org/faa-place/CA/Oakley), built 2016, S/N 156 T 503 LSA

## NTSB investigations (3)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB ERA20LA207](https://openairdocs.org/ntsb/ERA20LA207), Jun 5, 2020: Quad City Challenger (N850RW), Wurtsboro, NY, substantial damage, 2 fatal. Probable cause: A loss of control after takeoff due to the pilot’s improper use of ballast weight. Contributing was the pilot’s decision to operate the airplane above its maximum gross weight.
- [NTSB CEN12LA448](https://openairdocs.org/ntsb/CEN12LA448), Jul 17, 2012: Chapman Mark A Trike (N404EA), Marlboro, OH, substantial damage. Probable cause: The student pilot’s failure to maintain adequate airspeed during a turn, which resulted in an aerodynamic stall.
- [NTSB ERA11LA023](https://openairdocs.org/ntsb/ERA11LA023), Oct 17, 2010: Bobo Christopher J Loehle 5151 (N838B), Southern Pines, NC, substantial damage. Probable cause: The reported fluttering of the wings in flight and the pilot's subsequent in-flight loss of control for undetermined reasons.

## FAA accident and incident reports (4)

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [Accident 20200605010699A](https://openairdocs.org/incident/20200605010699A), Jun 5, 2020: Richard Wenzlick CHALLENGER II (N850RW), Wurtsboro, NY, Destroyed, 2 fatal. Immediately after take-off the aircraft appeared to yaw to the "left" and continue in the left hand turn until 90 degrees from the runway center line. The…
- [Accident 20120717014309A](https://openairdocs.org/incident/20120717014309A), Jul 17, 2012: Chapman Mark A TRIKE (N404EA), Marlboro, OH, Destroyed. [privacy data omitted] Has little to no flight experience and with the handling characteristics of the aircraft, all signs point to [privacy data omitted] not…
- [Accident 20101017051109A](https://openairdocs.org/incident/20101017051109A), Oct 17, 2010: Bobo Christ LOEHLE 5151 (N838B), Southern Pines, NC, Destroyed. The aircraft eperienced an in-flight component failure while in level, cruise flight. Several witnesses reported seeing the aircraft wings flaping up and down…
- [Incident 20100831046129I](https://openairdocs.org/incident/20100831046129I), Aug 31, 2010: Little Keen CHALLENGER (N3840G), Watertown, NY, Minor damage. Aircraft suddenly lost power while operating in cruise at 100 ft AGL and made an emergency landing on the saint lawrence river. The aircraft flipped over and…

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