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ASN Wikibase Occurrence # 147275
Last updated: 4 March 2021
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Type:Silhouette image of generic COY2 model; specific model in this crash may look slightly different
Rans S-6 Coyote II
Registration: 59-DCJ
C/n / msn:
Fatalities:Fatalities: 0 / Occupants: 2
Other fatalities:0
Aircraft damage: Substantial
Location:Aérodrome de Merville Calonne, 3 km S of Merville, Nord-Pas-de-Calais -   France
Phase: Landing
Departure airport:Aérodrome de Merville Calonne (LFQT)
Destination airport:Aérodrome de Merville Calonne (LFQT)
According to a rough translation from French into English of the official BEA accident report:

"The instructor and the student take off unpaved runway 04 for an aerodrome circuit session as part of a dropped flight on this ULM. After a first set-off, on initial climb to a height of about 300 ft, the engine stops abruptly. The instructor explains that he takes the controls to make a forced landing in a field. The student succeeded in restarting the engine and the instructor continued the flight in a low-level circuit to land on the runway. He indicates that he makes the orders to the student. In short final, the engine stops again. The instructor considers the height insufficient to allow a restart and that it is possible to rejoin the track. It lets the student perform the landing. The latter adds that, stressed, he rounds too high. The ULM hits the track hard and bounces several times. The landing gear breaks and the ULM comes to rest on the runway.

The instructor, aged 56, had a ULM pilot's license since 1998 and an ULM instructor rating since 2002. The 72-year-old student, the instructor's brother, was Holder of a ULM pilot license since 2000 (obtained by equivalence of the private pilot license). He had a total of 685 flight hours, 233 glider hours and about two hours on the 59-DCJ.

The student, also an aviation engineer, indicates that the fuel system of the engine that equips this ULM (BMW R1100) is sensitive to the phenomenon of "vapor lock (1)" and that it is not recommended to Idle too long to allow proper cooling. On the day of the event, traffic on the aerodrome was important. The ULM remained stationary about fifteen minutes with the engine idling before obtaining permission to take off.

The meteorological conditions were as follows: 070 ° wind for 10 to 15 kt, CAVOK, temperature 27 ° C, dew point 8 ° C, QNH 1016 hPa. These conditions were conducive to the phenomenon of "vapor lock".

- The accident is due to an erroneous assessment of the height during rounding.

Contributing to the accident:
- Excessive confidence of the instructor towards his pupil, a member of his family
- stress caused by the emergency

(1) The "vapor lock" originates from the boiling of the fuel at a high temperature in the supply circuit. Favorable factors are high altitude, immobilization of the aircraft at high temperature with low or no fuel flow, certain types of fuel or certain aircraft models.


1. FILE NUMBER BEA 59-j120725 at

Revision history:

01-Aug-2012 14:20 karyan70 Added
08-Jan-2017 18:18 Dr. John Smith Updated [Time, Operator, Total fatalities, Total occupants, Other fatalities, Location, Departure airport, Destination airport, Source, Narrative]
08-Jan-2017 18:19 Dr. John Smith Updated [Narrative]

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