Never, 2 stage latching process if you look carefully at it. The side cases are latched shut when the large locking handle is turned and pushed in to the first stop, then it engages the locking mechanism on the final push-in action. Pretty safe latching system really. It's a robust structure to cope with the loada associated with passengers using the grab handles.
The latches must be better than those on the panniers for the RT. I had mine pop open when I fierst gor the RT and didn't lock the bags. I thought the latches were pretty secure but they were not up the the rough road!
While I have an RT not an LT. If I store anything in the side panniers - I will lock the side panniers. Typically while commuting to/from work I do not lock the top box, but if I tour then the top box is locked as well.
It should go without saying when I park up, everything is locked!
The LT side cases vs the old Krauser and then BMW bags for the airheads are about as comparable as apples and fish. I've had the old bags not only pop open but fly off. I remember vendors selling those security straps for the bags at BMW rallies.
By comparison the latching mechanism on the LT cases is like a bulkhead hatch on a submarine. Once properly closed it ain't going anywhere. I never lock mine while riding.
No, Not locked when riding.
At final destination and times away from the bike absolutely. For those of you young enough remember the car trunk with the push button latch, or convertibles that were only closed when it rained or leaving your helmet and gloves on the seat to go in for a sit down meal. Need I say more. Central locking (fob) serves a purpose.
ride safe :bmw:
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