The unit powered many essential units of the aircraft, including the autobrake, antiskid, spoilers, and the flight recorders. Located directly behind the doghouse was the main equipment centre (MEC), which housed the aircraft's electrical power control and electronic units. The structure was a robust, rectangular shape which made up the aircraft's wheel well. At the aft of the wheel well was a structure that was referred as the 'doghouse'. The nose landing gear support structure was attached to the wheel well. The aircraft had accumulated a total airframe hours of 26,429 hours or 9,816 cycles.

It was configured with 235 passenger seats, most being triple seat units.

Two Rolls-Royce turbofan engines were installed on the aircraft. It was manufactured in 1992 with a manufacturer serial number of 26965 and was delivered to Britannia Airways in 1993. The aircraft was a Boeing 757-204 with a registration of G-BYAG. The aircraft was unable to stop and eventually veered off the runway. The aircraft entered a high rate of descent with a nose down attitude, creating an impact that was violent enough to dislodge the nose landing gear to the back and caused it to crash onto the aircraft's main electrical unit, resulting in an electrical failure that disabled all deceleration systems and in a sudden production of unwanted forward thrust. The body that was responsible for the investigation of the crash, the Civil Aviation Accident and Incident Investigation Commission (CIAIAC), concluded that the crash had been caused by destabilized approach, loss of external reference and loss of automatic height callouts while landing in Girona. The aircraft involved in the crash, Boeing 757-204 registration G-BYAG, was damaged beyond economical repair and scrapped. One of the passengers who had apparently sustained only minor injuries died five days later of unsuspected internal injuries. Of the 236 passengers and nine crew on board, two were seriously injured and 41 sustained minor injuries. On 14 September 1999, the Boeing 757-204 aircraft suffered a crash landing and broke apart during a thunderstorm in Girona-Costa Brava Airport. Girona–Costa Brava Airport, Girona, SpainĬardiff Airport, Vale of Glamorgan, United Kingdomīritannia Airways Flight 226A was an international passenger flight from Cardiff, Wales to Girona, Spain, operated by charter airliner Britannia Airways. Runway excursion due to destabilised approach

G-BYAG, the Boeing 757 involved in the accident, seen in 1993.

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