Frequency of overhaul of B744 Outflow valve
Can anyone please tell me how frequency an Outflow valve needs to be removed or components overhauled.
Is it scheduled in C, D checks?
""The outflow valve assembly in this case has accumulated over 100,000 flight hours since delivery on [the plane] and has never been removed prior to this event. As a follow-up to this we are removing all units [six affected] with [more than] 90,000 flight hours for condition check and reconditioning at workshop.""