What happened
On 3 December 2015, a Rockwell Commander 114B, registration 2-ROAM, departed Ronaldsway on a private VFR flight destined for Blackpool. During the approach, the pilot contacted Blackpool Approach to inquire about the weather, noting the presence of rain and low cloud. While the pilot expressed uncertainty regarding the suitability of the conditions, he elected to continue the approach toward runway 10.
As the aircraft progressed toward the airfield, it encountered a moving bank of low cloud. Radar tracking showed the aircraft descending through various altitudes, dropping from 70 and 800 feet down to 400 feet as it neared the aerodrome. During this period, the aircraft's groundspeed began to drop significantly, eventually reaching a minimum of 48 kt. The final radar contact at 0907 hrs showed the aircraft descending at 200 ft. Shortly thereafter, the aircraft disappeared from radar. Extensive search and rescue operations were launched, and while some debris and a shoulder bag belonging to the pilot were found, the aircraft was not located until several weeks later, resting inverted on the seabed.
The investigation
The AAIB investigation utilized radar tracks and radio transmissions to reconstruct the flight path. The investigation examined the meteorological conditions, noting that a warm front was bringing low cloud and reduced visibility to the area. Engineering analysis of recovered components, including the engine and propeller, revealed that the propeller blades were distorted, indicating the engine was producing power at the moment of impact with the sea. The investigation also reviewed the pilot's qualifications, noting he held a Private Pilot’s Licence but lacked an instrument rating.
Findings
- The aircraft encountered challenging weather conditions, including low cloud and mist, which were consistent with a moving warm front.
- The pilot was operating without an instrument flying qualification, making the transition into low visibility particularly difficult.
- The aircraft's groundspeed decreased progressively to a level below the typical stall speed range for the type.
- The aircraft may have stalled at a low altitude from which recovery was impossible, a hypothesis supported by the recorded reduction in speed and a potential stall warning heard on radio transmissions.
- The 'fishbowl' effect caused by the low cloud layers likely contributed to spatial disorientation and increased pilot workload.