Fumes can be the first indication

of a more serious problem and

should be treated with suspicion.

On 9 June 2014, a 'burning odour' of undetermined origin
became evident in the rear galley of an aircraft as soon as the
aircraft powered up for take off. Initially, it was dismissed as
not uncommon and likely to soon dissipate, but it continued
and affected cabin crew were unable to continue their normal
duties and received oxygen to assist recovery.
En route diversion was considered but flight completion
chosen. It was found that the rear pressure bulkhead insulation
had not been correctly refitted following maintenance and had
collapsed onto the APU bleed air duct.

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