# Accident 19990402003039A: Waco YMF, Baco Raton, FL, April 2, 1999 - Type: FAA accident report (Accident/Incident Data System), as reported - Date: April 2, 1999, 15:57 local time - Place: Baco Raton, FL - Airport: Boca Raton Airport - Damage: Substantial damage - Phase of flight: Fcd/Prec Ldg From Cruise - Operating rules: General operating rules (Part 91) - Location: 26.3785° N, 80.1077° W: Placed by OpenAirDocs at BOCA RATON (BCT), within about a mile (OpenAirDocs) - Nearby events: https://openairdocs.org/map.md?lat=26.3785&lon=-80.1077&mi=10 - Aircraft: N820MM, a cancelled registration (https://openairdocs.org/deregistered/N820MM-2007-10-26) (OpenAirDocs) - Registry model: Classic WACO YMF (registry code 2240101, https://openairdocs.org/model/classic-waco-ymf) (OpenAirDocs) - Registry engine: Jacobs R755B series (registry code 35007, https://openairdocs.org/engine/jacobs-r755b-series) (OpenAirDocs) - Reported make and model: WACO YMF - Fatal injuries: 0 - NTSB investigation: [NTSB MIA99LA117](https://openairdocs.org/ntsb/MIA99LA117) (OpenAirDocs) - FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/) - Page: https://openairdocs.org/incident/19990402003039A ## Narrative As the FAA filed it, in capitals; the FAA replaces private details with ^PRIVACY DATA OMITTED^. PILOT REPORTED THAT OIL WAS LEAKING ONTO THE ACFT WIANDSHIELD AND THAT HE WAS TRYING TO MAKE IT TO THE ARPT, THE ACFT OVERFLEW THE ARPT DUE TO OIL ON HE WINDSHIELD, THE ACFT STRUCK TREES, FLIPPED OVER, AND CAME TO REST IN A COMMON AREA BEHIND SOME HOUSES, OTHER CIRCUMSTANCES AE UNKNOWN. (FROM .4) THE PILOT REPORTED THAT DURING MANEUVERING FLIGHT, AT ABOUT 500 FEET AGL, AND 1/2 MILE OFFSHORT, THE ENGINE AND COWLING BEGAN TO SHAKE, THE ENGINE BEGAN TO SPUTTER, AND THE WINDSCREENS BECAME COVERED WITH OIL. HE MADE A TURN WESTBOUND TOWARD LAND, AND DECLARED AN EMERGENCY, INTENDING TO LAND AT THE NEAREST AIRPORT. HE REPORTED THE ENGINE POWER AVAILABLE WOULD NOT SUSTAIN LEVEL FLIGHT, AND HE STARTED A SLOW DESCENT. NEITHER THE PILOT NOR HIS FRONT SEAT PASSENGER ACQUIRED A VISUAL ON THE AIRPORT. THE PILOT OVERFLEW THE AIRPORT AND FORCED LANDED IN A RESIDENTIAL AREA 2 MILES WEST OF THE AIRPORT. EXAMINATION OF THE ENGINE FAILURE OF THE 12 CYLINDER HOLDDOWN STUDS OF THE NO. 7 CYLINDER. (-23) ON APRIL 2, 1999 AT APPROX. 1557, A WACO YMF-5, N820MM, CRASHED IN A RESIDENTIAL AREA OF BOCA RATON. PILOT AND PASSENGER RECEIVED MAJOR AND MINOR INJURIES RESPECTIVELY. PILOT AND PASSENGER WAS ON A AREA FAMILIARIZATION FLIGHT FROM FT. LAUDERDALE EXECUTIVE AIRPORT (FXE) WHEN PILOT DECLARED EMERGENCY DUE TO ENGINE VIBRATION AND HEAVY ENGINE OIL LEAK. POST INSPECTION OF ENGINE BY FAA AVIATION SAFETY INSPECTORS REVEILED THE CYLINDER BASE HOLD DOWN STUDS OF NO. 7 CYLINDER HAD FAILED SEPARATING THE INTAKE TUBE AND ASSOCIATED OIL HOSES AND DRAINS. VISUAL INDICATIONS OF THE AFT, TOP AND BOTTOM STUDS APPEARED TO HAVE BEEN BROKEN PREVIOUSLY AND PROGRESSED UNTIL ALL FAILED. ## 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 MIA99LA117](https://openairdocs.org/ntsb/MIA99LA117), Apr 2, 1999: Waco YMF-5 (N820MM), Boca Raton, FL, substantial damage. Probable cause: The pilot's failure to select a suitable forced landing site following a partial loss of engine power due to failed cylinder holdddown studs, and the subsequent collision with trees. A factor in the… ## Other reports on N820MM (1) Matched to the same aircraft by N-number and date. - [Accident 19970614019949A](https://openairdocs.org/incident/19970614019949A), Jun 14, 1997: Waco YMF (N820MM), Longville, MN, Substantial damage. Landed downwind overran end into a ditch. Flipped over. Windsock blocked by trees. Ditch not in airport diagrams. (-23) the Longville airport windsock is… 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.