Glass Windshields or Acrylic?
Wondering what percentage of 139's have glass or heated glass windshields?
We do have plain glass and have busted 4 each ( 1 RH, then 2 LH and just now the second RH) in the space of 14 months and 103 flt hours.
PPG says FOD impact, but we only go airport taxiway to airport taxiway 99.99% of the time. Always hangared.
Anyone with glass seen any micro chipping or such and not had window shatter.
PPG says that the specification for airworthiness is 10% damage depth and still OK, ie 0.012" is limit for damage on each layer of 0.125 glass. I measured our last FOD crush mark and got around 0.007", but optical micrometer will get more accurate data when returned to PPG.
Fly to Philly tomorrow to let AW investigate and determine if we have a freak airframe with a weird frequency or vibe and/or flexing nose section. Owner will not fly in again until cause is found.
Anyone got any info on glass windshield reliability, care to respond.
Thanks in advance
KC