# Accident 20240325005209A: Parmelee M/Parmelee N COZY MARK IV, Gonzales, TX, March 25, 2024 - Type: FAA accident report (Accident/Incident Data System), as reported - Date: March 25, 2024, 18:44 local time - Place: Gonzales, TX - Airport: Roger M Dreyer Memorial - Damage: Substantial damage - Phase of flight: Cruise/Level Flight - Operating rules: General operating rules (Part 91) - Location: 29.5327° N, 97.4664° W: From the FAA - Nearby events: https://openairdocs.org/map.md?lat=29.5327&lon=-97.4664&mi=10 - Aircraft: N20MN, registered now (https://openairdocs.org/aircraft/N20MN) (OpenAirDocs) - Registry model: Parmelee M/Parmelee N COZY MARK IV (registry code 05607XT, https://openairdocs.org/model/parmelee-m-parmelee-n-cozy-mark-iv) (OpenAirDocs) - Registry engine: Lycoming 0-360-A1D (registry code 41504, https://openairdocs.org/engine/lycoming-0-360-a1d) (OpenAirDocs) - Reported make and model: PARMELEE M/PARMELEE N COZY MARK IV - Reported engine: LYCOMING 0-360-A1D - People aboard: 1 - Fatal injuries: 0 - Other injuries: 0 - Pilot certificates: Private pilot - NTSB investigation: [NTSB CEN24LA141](https://openairdocs.org/ntsb/CEN24LA141) (OpenAirDocs) - FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/) - Page: https://openairdocs.org/incident/20240325005209A ## Narrative As the FAA filed it, in capitals; the FAA replaces private details with ^PRIVACY DATA OMITTED^. ON 03/25/2024, THE PILOT OF THE ACCIDENT AIRCRAFT CONTACTED SAN ANTONIO ATC DECLARING AN EMERGENCY DUE TO LOSS OF ENGINE. HE ADVISED ATC THAT HE WOULD ATTEMPT TO GLIDE INTO THE GONZALEZ AIRPORT (T20) FOR LANDING. HOUSTON CENTER LATER ADVISED THAT THEY WERE IN CONTACT WITH THE PILOT AND THERE WERE NO REPORTED INJURIES. THE AIRCRAFT LANDED SHORT OF THE RUNWAY AND SUSTAINED SUBSTANTIAL DAMAGE TO THE LEFT WING, LEFT AILERON TORQUE TUBE, LEFT ELEVATOR AND COLLAPSED THE NOSE LANDING GEAR. PRIMARY FIELD INVESTIGATION REVEALED THAT THE ENGINE STILL CONTAINED APPROXIMATELY FIVE QUARTS OF OIL. THE NORMAL OPERATING RANGE IS 4-6 QUARTS. HOWEVER, THERE WAS PRESENCE OF AN OIL LEAK THAT RESULTED IN AN OIL PUDDLE BETWEEN THE #2 AND #4 CYLINDERS. ADDITIONALLY, THE #1 AND #3 CYLINDERS HAD NO COMPRESSION. AN ENGINE TEARDOWN WAS CONDUCTED LATER AND REVEALED THE LEFT IDLER STUD MOUNT FOR THE GEAR THAT DRIVES THE ENGINE DRIVEN FUEL PUMP WAS SHIMMED AND THE STUDS IN THE ENGINE BLOCK FOR THE HOLD DOWN NUTS WERE NOT TIGHT. THIS ALLOWED MOVEMENT OF THE IDLER STUD LEADING TO ABNORMAL WEAR AND EVENTUAL FAILURE OF THE HARDWARE. ONCE THIS OCCURRED, THE GEAR MOUNTED ON THIS IDLER BECAME DISENGAGED WITH THE MAGNETO DRIVE GEAR WHICH ALSO DRIVES THE CAM. THIS CAUSED THE VALVES TO STOP BEING DRIVEN WHEN THE CAM WAS NO LONGER TURNING. ## The NTSB's investigation of this event (1) 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 CEN24LA141](https://openairdocs.org/ntsb/CEN24LA141), Mar 25, 2024: Cozy Mark IV (N20MN), Gonzales, TX, substantial damage. Probable cause: Maintenance personnel’s failure to properly torque the crankshaft idler gear hardware according to the engine manufacturer’s service instructions, which resulted in separation of the crankshaft idler… ## Other reports on N20MN (3) Matched to the same aircraft by N-number and date. - [Incident 20150428010499I](https://openairdocs.org/incident/20150428010499I), Apr 28, 2015: Parmelee M/Parmelee N COZY MARK IV (N20MN), Clarion, PA, Minor damage. At the landing touch-down, the aircraft's right main tire deflated causing damage to the right main wheel fairing which rolled under the tire and subsequently… - [Incident 20030510008379I](https://openairdocs.org/incident/20030510008379I), May 10, 2003: Amtr COZYMARK4 (N20MN), Livermore, CA, Minor damage. (-23) Pilot failed to ensure that the retractable nose gear was down & locked during the approach and landing phase of flight. Aircraft landed on the nose and… - [Incident 20020623022699I](https://openairdocs.org/incident/20020623022699I), Jun 23, 2002: Amtr COZYMARK4 (N20MN), Concord, CA, Minor damage. (-23) 10:50, 23 June 2002, experimental aircraft, a cozy mark 5, was landing at ccr, 23R nose gear collapsed and separated from aircraft after landing. No… 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. For accidents, the NTSB's own investigation is the fuller record. --- 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.