ref the earlier post about water drains , it is on a DAILY check . BUT , what is the frequency of a DAILY check on a 777 ?? 48 hours !!! Also to get water to 'settle' out of the fuel you need to follow the AMM procedure, which requires a minimum qty of fuel in EACH tank , and left for about 3-4 hours . In todays high utilisation scenario of long haul ops with short turnrounds how often does this happen ?? And for example on a 777 you're not putting fuel in the centre tank except on sectors over 7 hours generally so unless you pre fuel several hours before departure on a flight where you're using it you generally dont get a 'proper' water drain check. Having said that the modern systems with good scavenge and jet pumps does seem to work pretty well as we generally find very minute water quantities on a water drain these days. How many people remember taking a gallon of water out of the left wing tank every morning on a 737 when the -300's were brand new !! and that was european ops where we believe we have high fuel standards !!!! Note that this is clarification for those interested and not related to this incident as i am not upto date on BA's current procedures re fuel and water drains.