901 suffered a wiped #3 and #4 bearing on the #2 engine with significant metal shavings contained in the engine oil and had damage to the prop fan. So the engine was replaced and repairs done to the right engine pylon. The aircraft was out of service for approximately 2 weeks while replacing the engine since the supply of available engines is extremely limited.
N902NK is now out for service for a left engine replacement, similar to what happened to N901NK last month, time of repair is unknown due to engine supply constraints.
N903nk is now out of service in Denver with the same issue that has affected 901 (November) and 902 (December)
Awaiting ferry permit to DFW which will most likely be an engine change.
According to another person on the same forum, similar events happened with Volaris and IndiGo.
So what is "a wiped bearing"? I went to Google and found the following article:
http://www.waukbearing.com/en/technical ... e:-wiping/
A wiped bearing surface is where surface rubbing, melting and smearing is evident. This may be due to a variety of causes, including:
Excessive load at start-up/run-down
Loss of clearance
So which one is causing bearing damage on the PW1100G engine, and how can it be resolved?