Cessna 680 Citation Sovereign, G-CJCC
The crew experienced an uncommanded transfer of fuel from the right to the left fuel tank after following the checklist procedures for a left main electrical bus fault indication. The aircraft subsequently became left wing heavy and exceeded the lateral imbalance limits. It returned to Luton Airport where a flapless landing was completed without further incident. As a result of this incident, Special Bulletin S1/2010 was published on 8 October 2010, containing two Safety Recommendations. The investigation established that the isolation of the left main bus had caused a false fuel cross-feed command which resulted in the uncommanded fuel transfer. The aircraft manufacturer has published a temporary flight crew procedure to mitigate the effects of a recurrence and has also issued a service bulletin to incorporate a design solution. Eight further Safety Recommendations are made in this bulletin, relating to aircraft certification processes and flight recorder documentation.
Cessna 680 Citation Sovereign, G-CJCC 08-11.pdf (447.86 kb)
Date of occurrence: 30 September 2010