ASN Wikibase Occurrence # 22830
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| Date: | Sunday 14 September 2008 |
| Time: | 12:47 |
| Type: |  Zenair CH 601 XL Zodiac |
| Owner/operator: | private |
| Registration: | PH-4B6 |
| MSN: | 6-9860 |
| Fatalities: | Fatalities: 2 / Occupants: 2 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | near Hoorn, Noord-Holland -
 Netherlands
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | Middenmeer Airfield |
| Middenmeer Airfield | |
| Investigating agency: | Dutch Safety Board |
| Confidence Rating: |  Accident investigation report completed and information captured |
On 14 September 2008, at approximately 12.35, PH-4B6, a micro light aircraft (MLA), took of from the airfield of Middenmeer (in North Holland in the Netherlands). Two persons were on board: the pilot/owner and a passenger.
After take off from runway 05, the aircraft proceeded in a north easterly direction. Near the village of Kreileroord, a left turn of approximately 270 degrees was made and the aircraft subsequently proceeded in a south easterly direction towards Medemblik. Overhead Medemblik a turn of 360 degrees was made. The altitude during this part of the flight varied between 1100 and 1300 feet.
From Medemblik the PH-4B6 proceeded in a southerly direction towards Hoorn. The aircraft subsequently crossed overhead Hoorn towards the Markermeer at an altitude of approximately 1100 feet. Witnesses in that vicinity on the ground observed the right hand wing of the aircraft folding upwards and the aircraft subsequently crashed into the water of the Markermeer at approximately 12.47. Both occupants lost their lives in the accident.
Conclusion
Since the various other possible causes as indicated and/or analysed in this report could not have occurred or were very unlikely to have occurred, non linear flutter is the most probable cause of this accident. The following factors could have affected occurrence of this kind of flutter:
- Utilizing ailerons that are not mass-balanced.
- Low rotational-rigidity between wing and aileron.
It appeared from the investigation that inadequate proof was provided that the Zodiac CH601XL model complied with part of the German airworthiness requirements as established in LTF-UL of 30 January 2003. Since in the Netherlands, airworthiness requirements for MLA’s are not provided for and the Dutch authorities do not perform active supervision on the airworthiness of MLA’s, the possibility arose that for this type of aircraft model a (special) certificate of airworthiness was issued.
Accident investigation:
 |
|
Sources:
Dutch Safety Board Accident Report (see below)
Location
Images:
PH-4B6 Zenair CH601XL Zodiac at Seppe-EHSE 2 August 2008
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 14-Sep-2008 21:29 | RobertMB | Added |
| 15-Sep-2008 07:39 | Airflyer | Updated |
| 03-Jan-2009 23:32 | Anon. | Updated |
| 15-Apr-2009 10:04 | harro | Updated |
| 15-Apr-2009 11:28 | harro | Updated |
| 15-Apr-2009 11:33 | harro | Updated |
| 21-Sep-2020 19:36 | harro | Updated [Departure airport, Destination airport, Source, Narrative, Accident report, ] |
| 19-Jun-2022 12:09 | Ron Averes | Updated [Location, Source] |
Corrections or additions? ... Edit this accident description
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