Originally Posted by
mellon
would Air Canada be allowed to "extend" the 767 beyond its D check, because of the MAX issue. Is that something Transport Canada can allow?
I assume some of the 767 get parked because they are hitting D checks?
D checks could and should not be put off.
I found it inteterestig to learn, however that ACs Dash8 planes were hitting a different limitation--structural lifetime limit on total # of flights.
Since there was not easy access to replacement aircraft, the cycle count was raised by regulators (doubled IIRC). It was a multi year process and required among other things at least one aircraft to be destructively tested for metal wear and fatigue. Then an upgrade/rework/inspection needed carried out on the other planes.