Sudden climb may cause loss of windscreen
I have speculated that the ADIRU failure experienced by 9M-MRG, which led to a sudden climb, was experienced by 9M-MRO (on route MH370) on March 8, 2014. The sudden increase in the pressure differential across the hull may have led to another problem recently experienced by two other B777-200s.
On April 13, 2012, an Alitalia B777-200 (EI-ISB on route AZ-8320) flying from Rome to Dubai at FL370 declared an emergency near Athens. The first officer's windscreen had cracked. The crew descended rapidly to 6000 feet and diverted to Athens.
On July 3, 2012, an Air France B777-200 (F-GSPL on route AF-85) flying from San Francisco to Paris at FL370 declared an emergency over Hudson's Bay. The windscreen had cracked and the crew reported problems maintaining pressurization in the cabin. The crew descended to 10,000 feet and diverted to Montreal.
All three aircraft are of pretty much the same vintage:
Alitalia EI-ISB first flight December 18, 2002
Air France F-GPSL first flight June 12, 2000
Malaysian 9M-MRO first flight on May 14, 2002
One would need to know the number of cycles, rather than simply the calendar age, to determine if windscreen problems are fatigue-related, and possibly represent a systemic problem which is just now coming to light in the B777 fleet.