ANALYSIS
THE PERILS OF NOT MAKING THAT CRUCIAL CALL
According to currerrt industry wisdom, which is now being reviewed for fine tuning, pilots should abandon "unstable" approaches and go around safely. Between 3.5% and 4% of all approaches are estimated to be unstable, yet pilots make a go around decision in only a tiny fraction of those. What follows are examples of unstable approaches that should have prompted a go around decision but did not, with dire results.
6 July2013
Asiana Boeing 777 at San Francisco International airport, USA. The crew were carrying out a localiser/DME approach in excellent daylight visibility but were relying on the auto-throttle to keep the aircraft's approach reference speed correct, and were not monitoring
the air speed indicator. Because of the flight management mode selected and the fact that the crew had retarded the throttles manually to idle to correct a fast/high situation early in the approach, the throttles stayed in idle. The aircraft dipped below the glideslope and, when the crew noticed that they needed to go around, the airspeed was just 103kt (191km/h). The aircraft's tail hit the sea wall short of the runway threshold. It cartwheeled to a halt and three people were killed.
14 August 2013
UPS Aifbus A300-600F at Birminghamairport,Alabama, USA. The aircraft was carrying out a localiser/distance measuring equipment approach before dawn to a runway with no approach lights. It got too low over rising ground and hit trees, crashing about 1.000 m (3,280ft) short of the threshold.
5 January 2014
Vineland Corporation Bombardier CL600 business jet at Aspen County airport, Colorado, USA. It landed long in a high, gusting tailwind, bounced dramatically and rolled inverted, killing two of the three people on board. The landing was the second attempt. The pilot had carried out a go-around from the first.
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