It seems that the US Space Shuttle Discovery currently trying to return to Earth from mission STS-116 is having some trouble closing it’s port payload bay door.
A radio call from the Shuttle to the MCC in Houston TX suggest that the port door did not fully close when first attempted. The aft latch showed not ready to latch when the door closed.
The Space Shuttle has to close it’s payload bay doors in order to re-enter the atmosphere.
Currently they’re using internal payload bay cameras to inspect the port door at the aft bulkhead. You can follow the proceedings online at NASA TV
UPDATE: Problem solved. The not-latched indication appears to have been a faulty microswitch.
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