Off the back of the EASA AD 2008-0158 comes this AIC:
http://www.caa.co.uk/docs/810/INTERN...D2008-0158.pdf
Note that it is more onerous than the AD (which was little more than a placarding exercise), mandating that the unit cannot be used in class A & C, Class D & E (under IFR), above FL100 and in NTMZ (and should even be switched off whilst VFR in class D/E).
As a Garmin dealer I have to say ...... "Always thought those boxes looked a bit iffy"
