Accident Fokker S.11.1 Instructor PH-ACG, Friday 16 June 2023
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Date:Friday 16 June 2023
Time:c. 15:20
Type:Silhouette image of generic S11 model; specific model in this crash may look slightly different    
Fokker S.11.1 Instructor
Registration: PH-ACG
MSN: 6279
Year of manufacture:1951
Engine model:Lycoming O-435-A
Fatalities:Fatalities: 0 / Occupants: 2
Other fatalities:0
Aircraft damage: Substantial
Location:W of Teuge Airport, Gelderland -   Netherlands
Phase: Initial climb
Departure airport:Teuge Airport (EHTE)
Destination airport:Lelystad Airport (LEY/EHLE)
Investigating agency: Dutch Safety Board
Confidence Rating: Accident investigation report completed and information captured
A Fokker S.11-1 Instructor was unable to climb after performing a touch-and-go at Teuge Airport (EHTE). A forced landing was carried out in a field and the aircraft came to rest inverted.
Both occupants sustained minor injuries and the aircraft received substantial damage.

The pilots had fueled the aircraft at Teuge International Airport (EHTE) for a flight to Lelystad Airport (EHLE). Before setting course, the pilots performed a touch-and-go. According to the pilots, the engine, an Lycoming O-435-A, initially responded normally when full throttle was selected. However, immediately after liftoff it became apparent that the aircraft did gain less altitude. A witness on the ground stated the engine was running smoothly, but that the aircraft remained in ground effect and did not climb nor accelerate. After this, the pilots noticed that the engine no longer provided the ability to keep the aircraft at a minimum altitude and decided to make an emergency landing in a field.

The mixture lever was found stuck, halfway between the lean and rich position. The aircraft’s flight manual states that the mixture lever must remain in the rich position when operating the aircraft below 1,500 metres altitude.
The technical examination carried out by the owner showed that the engine mounting was bent and the engine controls no longer functioned fully. Further investigation has not yielded any information that could explain the cause of the engine problem. The lock mechanism of the mixture handle no longer functioned due to wear. This may have caused the mixture control to partially move from “rich” to “lean”, causing the engine to receive too little fuel and a loss of power.

Accident investigation:
Investigating agency: Dutch Safety Board
Report number: 2023112
Status: Investigation completed
Duration: 5 months
Download report: Final report





Revision history:

16-Jun-2023 13:56 harro Added
16-Jun-2023 13:58 harro Updated
16-Jun-2023 15:09 RobertMB Updated
16-Jun-2023 18:40 Hoekb03 Updated
29-Sep-2023 08:19 Ron Averes Updated
03-Dec-2023 11:11 harro Updated [Other fatalities, Destination airport, Narrative, Accident report]
03-Dec-2023 12:55 harro Updated [Other fatalities]

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