ASN Wikibase Occurrence # 242644
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| Date: | Saturday 19 September 2020 |
| Time: | 11:56 |
| Type: |  Diamond DA40D Diamond Star TDI |
| Owner/operator: | Vliegclub Schiphol |
| Registration: | PH-TDS |
| MSN: | D4.250 |
| Year of manufacture: | 2006 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | near Den Bommel, Zuid-Holland -
 Netherlands
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | Amsterdam-Schiphol International Airport (AMS/EHAM) |
| Midden Zeeland Airfield (EHMZ) | |
| Investigating agency: | Dutch Safety Board |
| Confidence Rating: |  Accident investigation report completed and information captured |
At approximately 11.30 hours, the single engine Diamond DA-40 aircraft, registered as PH-TDS, took off from Amsterdam Airport Schiphol for a VFR flight to Midden Zeeland Airport. The pilot was the only occupant onboard. He had accumulated 360 hours in total, of which 100 hours on the DA-40. After having flown a Victor departure, he left the control zone (CTR) of Schiphol and flew on a southerly heading at 1.200 ft, the pilot had established contact with Amsterdam Information of Air Traffic Control the Netherlands (LVNL).
According to the pilot the fuel tanks were full when he departed from Schiphol and after approximately 20 minutes he was flying above the Haringvliet waters. He observed that engine oil pressure decreased, shortly came back a little after which it declined to ‘zero’. The piston engine started to malfunction and power fell back after which the engine stopped. At 11.55 hours the pilot issued a Maday call to Amsterdam Information and reported he had an engine failure. As the pilot was conducting a glide he reached the shore near the village of Den Bommel. The pilot made an emergency landing in a field with crops, which he had initally viewed as grass.
The pilot suffered no considerable injuries, the aircraft was substantially damaged.
While reading the before take-off checklist at Schiphol the pilot had not experienced any anomalies on the engine.
Despite the decreasing oil pressure as observed by the pilot, it appeared that no engine oil had leaked. The diesel engine of the manufacturer Continental Aerospace Technologies (formerly Thielert) was relatively new with 196 flight hours. Metal parts were found in the oil filter and the crankshaft appeared to be broken.
The BFU and the German manufacturer accomplished a further teardown of the engine of PH-TDS. Besides other damage it appeared that stud bolts of one of the crankshaft main bearing caps were broken.
The damage assessment of the crankshaft and the main bearings of the engine of PH-TDS shows that due to the failure of main bearing #2, the crankshaft no longer appropriately aligned in all the bearings in the engine block. As this caused a cyclic load, the crankshaft ultimately failed due to fatigue and the engine block cracked, making an engine failure inevitable.
To assemble the engine the manufacturer uses four variants of stud bolts. All failed stud bolts were of the same (dark colored) variant and showed fatigue fractures. During the manufacturing process the failed stud bolt had been rolled before the heat treatment whereas the other variants (shiny colored) had been cold rolled after the heat treatment. The shiny colored stud bolts demonstrated a better resistance against fatigue than the dark colored stud bolts.
Although the manufacturer found sufficient safety margin for the dark colored stud bolts in its calculations against fatigue, it can be concluded that the calculation methodology does not take into account all in-service conditions. The assembly process of the engine does not appear to be a factor for the failed stud bolts.
Sources:
https://www.rijnmond.nl/nieuws/199240/Sportvliegtuigje-maakt-noodlanding-in-suikerbietenveld-bij-Den-Bommel
https://igo.nl/nieuws/actueel/artikel/27924/Sportvliegtuigje-maakt-noodlanding-in-suikerbietenveld-Den-Bommel
http://www.vliegclubschiphol.nl/ons-vliegtuig/
https://www.onderzoeksraad.nl/en/page/19895/kwartaalrapportage-luchtvaart-3e-kwartaal-2021
https://flightaware.com/live/flight/PHTDS
Media:
In Den Bommel heeft een sportvliegtuigje een noodlanding gemaakt. De piloot is ongedeerd. De luchtvaartpolitie start een onderzoek. pic.twitter.com/BGasVocAf5
— MediaTV (@mediatvnl) September 19, 2020
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 19-Sep-2020 18:51 | harro | Added |
| 19-Sep-2020 18:53 | harro | Updated [Embed code] |
| 19-Sep-2020 19:12 | RobertMB | Updated [Aircraft type, Source, Embed code, Narrative] |
| 21-Dec-2021 20:50 | harro | Updated [Destination airport, Source, Narrative] |
| 21-Dec-2021 20:51 | harro | Updated [Narrative] |
| 22-Jun-2022 01:36 | Ron Averes | Updated [Location] |
| 14-Sep-2022 18:21 | harro | Updated [Narrative, Category] |
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