A loud 'CRACK' was heard ex-BOM one night.
Close examination determined that the LH forward pilots window had a significant crack, about 20 inches long.
In the L1011, no cabin pressure change is called for, nor desired.
These windows are really tough...and expensive, but last a long time.
These windows are curved, with quite good optical qualities.
Cost new...$68k.
Compare this with B707 windshields.
Cracks require a lower cabin pressure, and can develop significant deformation, which certainly gets your attention...darn quick.
