Are BA adding 15 minutes to duty time for the crew to close window blinds? If not then why should the crew perform that role? Sorry but if I am off duty then thats my time not the company's.
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I believe BA allow 30 minutes after gate arrival to allow for disembarkation, security checks and clearing passport control. This is the same as my airline here in Oz and generally it can take 20 minutes to get the PAX off so you are soon into your 'own time'. This has been done for years and the crew say nothing but to be asked to perform another duty would definately be a no from me. Its not a reasonable request to be asked to work and not be compensated.
Also, have BA done a risk assessment on this practise?