On 4 June 1967 a Canadair C-4 Argonaut passenger aircraft owned by British Midland Airways crashed near the centre of Stockport, Cheshire, England. Of the 84 people on board, 72 were killed. It is the fourth-worst accident in British aviation history. Accident The aircraft, registered had been chartered by Arrowsmith Holidays Ltd and had left Palma de Mallorca at 5:00 am, carrying holidaymakers back from the Balearic Islands to Manchester Airport. The approach controller vectored the aircraft towards the ILS as soon as it reached the Congleton NDB, but the pilots were apparently unable to put the aircraft on the extended runway centreline and called an overshoot. As the aircraft was making a second approach to the airport, the No. 3 and 4 engines suddenly cut out over Stockport. The No. 4 propeller was feathered, but No. 3 kept windmilling. The aircraft became uncontrollable and crashed at 10:09 am local time in a small open area at Hopes Carr, close to the town centre. Despite the crash occurring in a densely populated area, there were no fatalities on the ground. Members of the public and police risked harm to save twelve people from the mangled debris. However, a fire started towards the rear of the aircraft after the fuel tanks had ruptured and wicked back through the cabin, engulfing and killing most of the fuel-soaked passengers. Because it was a Sunday and people were not at work the accident drew a large crowd, estimated at around 10,000, hampering the rescue organisations. Investigation Investigators with the Accidents Investigation Branch (AIB) determined that the double engine failure had been caused by fuel starvation, due to a previously unrecognised flaw in the model's fuel system. The Argonaut had eight fuel tanks, divided into pairs. Each pair fed one engine, but there was also a cross-feed system that allowed fuel from a pair of tanks to be fed to other engines, if necessary. It was found that the selectors controlling the cross-feed valves were poorly placed in the cockpit, and difficult to operate, also giving an unclear indication of what was selected. This could cause the inadvertent selection of cross-feed from some pairs of tanks, leading to the exhaustion of fuel in those tanks and the failure of the associated engine. These problems had been noticed by pilots of other Argonauts before, but neither British Midland nor the other airlines using the Argonaut (Trans-Canada