Increase in maintenace interval frequency?
You hear a lot about maintenance interval escalation where the maintenance task frequency is reduced based on sufficient operational feedback.
But what about increases in the maintenance interval frequency? I suppose this would mean that relevant MSG-3 analysis is incorrect rather than conservative which is the typical case for escalation.
Does anyone know of any examples where airline findings have led to increases in the maintenance interval frequency and so the revision of the MSG-3 analysis?
The 15-year old 737-300 Southwest Airlines Flights 2294 and 812 fatigue-induced fuselage skin rip decompressions and subsequent AD springs to mind. However, what I'm after is whether anyone knows of any cases of proactive reporting of findings from airlines that supported an increase in the maintenance interval frequency.
It seems that we're quite saturated by hearing of things happening the other way around i.e. escalation or reactively via ADs after an incident/accident.