Shoreham Airshow - Hawker Hunter crash :(

Bit like out of date emergency flares on my boat...

They still work as expected many years after their use by date. Assuming they are kept well and dry..

You don't like to hand them in, as when you do need them, you want as many as possible!!
 
Unlike flares though, you can't try a different one if/when one fails.
 
http://www.caa.co.uk/News/CAA-statement-on-AAIB-special-bulletin/

In relation to the validity of the alternative means of compliance (AMOC) for ongoing maintenance of the aircraft, we have already informed the AAIB that this was in place and was valid at the time of the accident.

Work under the alternative means of compliance was carried out in January 2014 with the next inspection due in January 2016 making the organisation and the aircraft compliant with the Mandatory Permit Directive.
 
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