What happened
On November 30, 2008, a Boeing 737, registered G-LGTG, operated by British Airways, was performing a commercial passenger flight approaching Faro Airport (LPFR). During the approach phase, after the landing gear had been extended, the nose gear indication lights displayed both green and red lights simultaneously.
As the crew was unable to resolve this indication anomaly while in flight, the aircraft proceeded to land. The landing itself was completed without further incident or damage to the aircraft.
The investigation
Following the event, maintenance personnel inspected the aircraft and identified a defective nose gear latching relay. Due to the unavailability of a direct replacement part, maintenance crews performed a component swap, using an auto speedbrake control relay to replace the faulty unit. The aircraft was subsequently dispatched in accordance with the Minimum Equipment List (MEL) under provision 27.7.
While the GPIAAF provided information regarding the incident, the UK Air Accidents Investigation Branch (AAIB) was notified but chose not to launch a formal investigation, instead forwarding the relevant information to the Civil Aviation Authority (CAA).