Happened 3 times to me before on an A310, some A/C has 3 ply windshields and some has only 2 ply ones. MEL stated 2 part numbers, one is ok for 1 sector and the other which was our case ofcourse was a 10 sector cracked winshield OK as long as cracked ply is the external one and visibility is fine on affected side to complete an approach followed by a visual landing (specialy in case of pilot incapicitation on good side) judged by captain ofcourse not maintenance. Believe it or not AOG spare winshield took 4 days to arrive, aircraft flew it's 10 sectors with absolutely no problems or further extensions of cracks till the spare made it!!