Event Details

Title:Failure of flap deflection control track, Boeing 767-319 ZK-NCH, approach to Auckland International Aerodrome, 19 May 2001
Micro summary:This Boeing 767-319 lost a flap deflection control crack on approach.
Event Time:2001-05-19 at 1450 NZST
File Name:2001-05-19-NZ.pdf
Publishing Agency:Transport Accident Investigation Commission (TAIC)
Publishing Country:New Zealand
Report number:01-00401-004
Site of event:Auckland International Aerodrome
Latitude/Longitude:S3700.5' E17447.5'
Departure:Auckland International Airport, Auckland, New Zealand
Destination:Kingsford Smith Airport, Sydney, Australia
Airplane Type(s):Boeing 767-319
Flight Phase:Approach
Operator(s):Air New Zealand
Type of flight:Revenue
Serious Injuries:0
Other Injuries:0
Executive Summary:On Saturday 19 May 2001, at 1450, Boeing 767-319 ZK-NCH was on approach to land at Auckland International Aerodrome when a section of a wing flap deflection control track separated from the aeroplane. The 3 kg section penetrated the roof of an occupied warehouse and fell to the floor without causing personal injury. The crew of ZK-NCH were unaware of the event and continued with a successful landing.

The flap control track failed owing to a fatigue crack. The failure of the track was accelerated by the coincidental inclusion of slag during manufacture and extended aircraft operations at very low temperatures but still within its flight envelope.

The safety issue identified was the fatigue life of the flap control track. As a result of the incident other Boeing 767 maintenance organisations were informed and the operator initiated an additional regular inspection of the flap control track. The manufacturer subsequently reviewed the operation of the flap control track and began developing an inspection schedule to enable a cracked track to be identified before failure.

Learning Keywords:Operations - Maintenance
Systems - Flight Control System
Systems - Flight Controls - Spoilers - Slats - Flaps
Close match:Boeing 747-419 ZK-NBS flight NZ 2, in flight flap separation over Manukau Harbour by Auckland International Airport, 30 August 2002
Excessive right aileron required on Boeing 737-400, EI-BXB, at Dublin Airport
Flight control system failure, Report on the incident to Airbus A320-212, G-KMAM, London Gatwick Airport, on 26 August 1993
Loss of engine and stall on takeoff, American Airlines, Inc., DC-10-10, N110AA, Chicago-O'hare International Airport, Chicago, Illinois, May 25, 1979
Uncommanded roll, McDonnell Douglas DC-9-15, July 12, 1997
Roll control difficulties, McDonnell Douglas MD-11F, N583FE, January 15, 2003


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