2018 service interruptions The helicopter was out of service for over a month in June and July 2018, while a technical failure was investigated. Flight operations were also suspended for two weeks in August 2018 as the aircraft, vehicles and airbase buildings were examined to ensure no contamination resulting from the
2018 Amesbury poisonings was present. The aircraft did not respond to the poisonings as it was again grounded due to a technical failure, but there was concern that traces of
Novichok agent may have been transferred onto equipment used by critical care paramedics who responded in
rapid response vehicles (RRV). The charity later said the interruption had resulted in additional costs of £100,000.
2019 grounding In early January 2019, the helicopter was grounded after an incident during pre-flight checks, which was similar to the June 2018 incident. The situation was complicated by the entry into voluntary liquidation of Heli Charter, who supplied the aircraft and were the holder of the
air operator certificate (AOC). Medical provision continued by way of RRV, before the service returned to flying on 11 January 2019 with the delivery of a temporary
MD 902 supplied by Specialist Aviation Services, the company that supplied the aircraft shared with Wiltshire Police until 2014. The charity declared its intention to apply for its own AOC to allow it to operate the Bell 429 directly, but cautioned that this could not occur until the cause of the January incident had been established. In response to this incident and two more elsewhere, the helicopter's manufacturer issued changes to the Flight Manual in April. The
Civil Aviation Authority (CAA) completed inspections in August and issued the AOC in November, enabling the Bell 429 to re-enter service. The CAA's delay had been criticised by local MP
Michelle Donelan in October, and in December
Private Eye magazine claimed that the CAA had "dragged its feet" and stated that the charity had made a formal complaint to the CAA. In April 2020, the
Air Accidents Investigation Branch (AAIB) published their report into the 2018 and 2019 incidents, which were together classed as a "serious incident". The report called for
Bell Textron, the helicopter manufacturer, to improve the procedure for conduct of the Power Assurance Check; Bell also undertook to make future improvements to the flight control system software. The AAIB also found that the
cockpit voice recorder had been affected by the fitting of
TETRA communications equipment in 2015, and the defect had not been found during annual checks by the recorder's manufacturer, leading to a recommendation to the
European Aviation Safety Agency regarding checks to be made after adding equipment. ==Finances==