Lower hatch

There was a failure in the operation of the lower hatch during closing, which was probably caused by mechanically ware of the hinge which caused the hatch to bouncing back a short bit. This required the controls of the hatch to be changed to account for this, and make the hatch close properly. This caused some concern as the hatch is controlled by a PLC (programmable local control unit), and the programming device is a quite old laptop. We have spares for the PLCs but no spare for the programming device. The PLC programming software requires a Windows machine with an old fashioned serial port hardwired in it, and tests with an advanced USB based serial port on the old building drive laptop failed. Fortunately, we do have a Windows machine with an old fashioned serial port, and there was no problem to install the programming software and load a new program.