747 Lax Lhr
Janspeed,
I f you read the CAA report on this incident the BA crew were deemed to have carried out a safe operation. A B744 on three engines loses no systems, and is still Cat111C for landing. Flys a bit lower and slower, and as long as route has no implications if another engine shut down ,then no problem. The only reason the a/c diverted to Manchester was finger trouble on the crews part with fuel crossfeeding, leading them to believe they had unusable fuel. They in fact had ample fuel for Lhr.
A B744 on three engines has more redundancy than a fully serviceable Twin!!