Originally Posted by
ORDnHKG
D check is not performed when they put in new C, if it is true, then you would see planes with new C also come with new color,
These two things are unrelated. The airplanes are
not stripped of paint at the D check.
Originally Posted by
ORDnHKG
D check require to strip off the paint at the fuselage in order to inspect cracks.
Again, not true. Very few skin inspections require stripping the paint, and those that do are typically done by stripping just that specific area and then repainting that small area. This is why you will sometimes see new areas of paint within the original paint job.
Originally Posted by
ORDnHKG
In reality, there are planes with new color but old C, e.g. N171UA and N177UA. And planes in old color but new C, e.g. N127UA
True, since the visits are unrelated, this can happen.
The IPTE work is done:
a.) as a standalone visit
b.) in conjunction with c-checks
c.) in conjunction with d-checks
and each visit takes a different amount of time.