ASN Wikibase Occurrence # 244326
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| Date: | Sunday 9 August 2020 |
| Time: | 16:39 |
| Type: |  Cessna 208B Supervan 900 |
| Owner/operator: | Verein für Fallschirmsport Marl e.V. |
| Registration: | D-FSRT |
| MSN: | 208B0358 |
| Year of manufacture: | 1993 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | None |
| Category: | Serious incident |
| Location: | near Marl-Polsum -
 Germany
|
| Phase: | En route |
| Nature: | Parachuting |
| Departure airport: | Marl-Loemühle Airfield (EDLM) |
| Marl-Loemühle Airfield (EDLM) | |
| Investigating agency: | BFU |
| Confidence Rating: |  Accident investigation report completed and information captured |
After dropping parachutists, a Cessna 208B Supervan 900 (D-FSRT) was descending in Class E airspace when it came close to a Cessna 172P (D-ERJP).
The minimum distance determined was approximately 18 meters horizontally and 30 ft (9 meters) vertically. Both aircraft flew under visual flight rules (VFR).
The Cessna 208B aircraft was descending to Marl-Loemühle Airfield. The pilot was the only occupant. Previously he had dropped 18 parachutists at FL140.
At 16:37 the pilot received the descent clearance from Langen-Radar to leave Class C airspace: "[...] descent to the west approved, QNH one zero one six." At 16:38 the pilot received the clearance "[...] own navigation". At 16:39:37 the pilot reported: "[...] is clear of charlie". At 16:39:40 he received the clearance to leave the frequency. The pilot stated that he had not seen any other aircraft. Also, the built-in collision warning system (PowerFLARM) did not generate a warning. He did not receive any traffic information from Langen-Radar regarding the other aircraft.
The other aircraft was on a private sightseeing flight. Take-off and destination was the commercial airfield Borkenberge. A pilot and three passengers were on board. The pilot was in radio contact with Langen-Information. The aircraft was in cruising flight with a course of approx. 005° at 2370 ft AMSL when a very fast, rapidly sinking other aircraft appeared from above left, behind the top of the forward windscreen. It had been in a left turn.
In his estimation, without an evasive maneuver on his part, a collision would have occurred within the next two seconds. The horizontal distance during the sighting was about 20 meters, while the other aircraft was at the same altitude. He pulled the rudder fully and turned fully to the left. He lost visual contact with the other aircraft. The pilot did not receive any traffic information from Langen-Information regarding the other aircraft.
According radar data, the airprox took place at 16:39:42 at an altitude of about 2100 ft AMSL.
Conclusions:
- The pilot of the skydiving aircraft flew at a high rate of descent and speed through uncontrolled class G airspace. As a result, he was able to perform the "see and avoid" procedure, which was already fraught with weaknesses, in an even more limited manner. He did not see the other aircraft at any time.
- The pilot of the Cessna 172P only saw the drop plane at the time of passing. He would very likely not have been able to avoid a collision, despite his avoidance manoeuvre, due to the late visual contact.
Contributing factors:
- The Cessna 208B's collision warning system was not functioning, due to outdated firmware.
- The STCA did not perform its task due to configuration-related suppression of alerts in certain configurations.
- The pilots did not receive any traffic warnings or information from air traffic control, although there was both radar and radio contact with both.
- An indication of the firmware expiry date, and thus an indication of when the PowerFLARM collision warning device would no longer generate warnings, was missing from the Cessna 208B.
Accident investigation:
 |
|
Sources:
BFU20-0638-7X
https://www.fallschirmsport-marl.de/ueber-uns/flugzeuge/
https://www.jetphotos.com/registration/D-FSRT?term=D-FSRT
History of this aircraft
Other occurrences involving this aircraft
| 9 February 2017 | D-FSRT | Paranodon Fallschirmsport Illertissen | 0 | Illertissen Airport | |
sub |
Images:
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 23-Oct-2020 17:30 | ASN Update Bot | Added |
| 24-Oct-2020 08:19 | harro | Updated [Aircraft type, Operator, Departure airport, Destination airport, Source] |
| 24-Oct-2020 08:20 | harro | Updated [Narrative] |
| 24-Oct-2020 12:50 | harro | Updated [Time, Total occupants, Narrative] |
| 24-Oct-2020 16:02 | harro | Updated [Photo] |
| 25-Oct-2020 20:46 | Anon. | Updated [Source] |
| 19-Dec-2021 18:00 | harro | Updated [Narrative, Accident report] |
Corrections or additions? ... Edit this accident description
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