Heads up on the Cessna 441. Check your emergency exit doors for debonding and blowing out.
Cessna 441 in Flight Depressurisation due to Emergency Exit door bonded skin
failure
An Airworthiness Bulletin is an advisory document but are not
mandatory.
1. EffectivityAll Textron/Cessna 441 aircraft
2. PurposeThis AWB is raised following a report to CASA of an inflight depressurisation
caused by the failure of the bonded skin panel on the R/H emergency exit door.
3. BackgroundThe subject aircraft has CASA STC SVA 528 applied. This STC extended the life
of the airframe from 22,500 hours, to 40,000 hours.
This failure has occurred at 27,116HR / 23,484CY, which is 4616 hours into the
life extension period per STC SVA 528.
Initial investigations suggest that the bond degradation may be independent of
the hours/cycles accumulated and that the primary driver may be ageing and
degradation of the bond adhesive. Once degradation of the bond occurs,
hours/cycles likely play a higher order role in disbond progression to failure.
Full details.
https://www.casa.gov.au/file/216043/download?token=j2mPR9-o