Casualties unknown

2003-08-26: Avro 146-RJ100 (G-CFAD) — London City Airport, London, GB

London City Airport, London, GB

On August 26, 2003, an Avro 146-RJ100 (registration G-CFAD) was involved in an aviation accident near London City Airport, London, GB. Investigators recorded the probable cause as: The aircraft descended slightly below the glidepath during approach. In regaining the glidepath, insufficient power was used to correct the decay in airspeed, and the thrust levers were closed early during the landing flare. This summary draws on records from the UK Air Accidents Investigation Branch (AAIB).

Sourcesthe UK Air Accidents Investigation Branch (AAIB)Primary reportUpdated 1785053200Data APIEditorial standards
Aircraft registered G-CFAD
Aircraft registered G-CFAD. Photo: Ken Fielding / CC BY-SA 3.0, via Wikimedia Commons

On 26 August 2003, an Avro 146-RJ100 (G-CFAD) struck its tail on landing at London City Airport after descending below the glidepath. No injuries occurred but fuselage damage was sustained.

Flight History

The aircraft operated a passenger flight from Glasgow Airport to London City Airport on 26 August 2003. The co-pilot handled the approach to Runway 10, which has a 5.5° glideslope. The commander took control at approximately 800 feet above ground level and disengaged the autopilot and autothrust. At between 100 and 200 feet, the commander increased pitch as the PAPI indicated three red lights. At 100 feet, the thrust levers were moved to idle. Both pilots noted a sink, and the commander increased pitch again. The aircraft touched down, but the co-pilot observed a slightly higher than normal pitch attitude. After landing, air traffic control requested a runway inspection, which confirmed a tail strike.

Weather Conditions

The weather at the time included a light wind from 030° at 6 knots, visibility of 10 kilometres, and a broken cloud base at 4,500 feet. No turbulence or windshear was reported.

Flight Recorder Data

Flight data recorder information showed the autopilot and autothrust were disconnected at 800 feet, with an airspeed of 125 knots indicated. The aircraft remained on the glideslope until about 280 feet, when it began descending below the glidepath. The maximum deviation was 0.92 dots below the glideslope at 128 feet. At 75 feet radio altitude, the aircraft temporarily regained the glideslope at 119 knots indicated airspeed and 1.75° nose-down pitch. The flare transition lasted 5 seconds, with an average descent rate of 636 feet per minute. Half a second before touchdown, the descent rate was 480 feet per minute. Touchdown occurred at 107 knots indicated airspeed with a pitch attitude of 7.82° and normal acceleration of 1.775g.

Aircraft Damage and Runway Evidence

The rear fuselage sustained damage from frame 36 to frame 36Y, spanning 1.7 metres. The tail bumper was largely ground away, and fuselage skins showed abrasion up to 27 centimetres wide. Internal frames were locally buckled, but overall structural integrity was not immediately threatened. A scrape mark on the runway, located approximately one metre right of the centre line and 200 metres beyond the threshold, matched the damage. The mark began as a single contact and broadened to 20 centimetres over 5.3 metres, crossing a runway light, then extended a further 1.7 metres to a maximum width of 27 centimetres before fading. The strike occurred at or near initial wheel touchdown within the normal landing area.

Company Standard Operating Procedures

The operator's procedures for a steep ILS approach specified maintaining VREF33 + 5 knots plus gust factor during the glideslope descent, with landing gear, 33° flap, and airbrake extended. Speed was to be reduced to cross the threshold at VREF33 plus gust factor. A Flight Operations Bulletin on tail strikes noted that one likely cause is a flare too early or prolonged during a steep approach, leading to sink and potential over-rotation. The bulletin advised that more than 4° pitch up in a correctly executed flare is unusual.

Probable cause

The aircraft descended slightly below the glidepath during approach. In regaining the glidepath, insufficient power was used to correct the decay in airspeed, and the thrust levers were closed early during the landing flare. This resulted in the aircraft being 8 knots below the correct speed at touchdown. In an attempt to arrest the rate of descent in the flare, an abnormally high pitch attitude was reached, causing the aircraft to strike its tail on the runway.