Last week I was returning to London from southern France.
The Skip lined up the 73-800 and we were cleared for t/o. The skip spooled up the engines, we set the t/o thrust, and about 85 kts we got a disgusting smell similar to rotten eggs. At this point the aircraft is just slightly pressurising.
Nothing was said in the t/o role. Last night's Madras could have been taking it's toll on one of us.
Anyway we had just started the climb and the initial turn on the departure through 2500ft and the cabin crew ding us as they have had a very strong smell throughout the whole aircraft.
There were no birds on the roll, and we checked the engine indications. The smell disappeared and everything looked normal so we returned to London without a problem and had engineering meet us on stand and check everything.
We came to the assumption that it was a fume event. The engineer didn't want anything put in the tech log and said he would check it out. Obviously nothing heard since.
Apart from a company memo from Boeing that overfilling of the hydraulic reservoirs can lead to fluid ingestion into the air con system.
All a bit on the dodgy side.
