Cba From United States of America, joined Jul 2000, 4530 posts, RR: 3 Reply 18, posted (12 years 1 month 6 days 14 hours ago) and read 1356 times:
I didn't realize that a D check was needed so soon. Are these checks due after a certain amount of cycles or years? I'd guess cycles, because I saw an add for a 25 year old DC-10-30 that was up for a D check soon.
RayChuang From United States of America, joined Jun 2000, 7696 posts, RR: 5 Reply 19, posted (12 years 1 month 6 days 10 hours ago) and read 1331 times:
Based on my cousin told me about C and D check overhaul procedures at TWA, the pictures are NOT that of a D check overhaul.
For one thing, it appeared they didn't completely remove all of the interior fittings in the passenger seating area; a D check overhaul would involve removing the overhead bins and all the interior walls on the plane.
However, engines are frequently removed from the plane on a C check overhaul. I remember in 1982 when I saw a TWA L1011 undergoing C-check overhaul all three RB.211-22B engines were removed from the plane.
PhilB From Ireland, joined May 1999, 2915 posts, RR: 14 Reply 21, posted (12 years 1 month 6 days 5 hours ago) and read 1285 times:
As we don't know where in the cycle of the check these photos were taken, you cannot surmise it is not a D check by what is and is not in the photos.
I can surmise it is because BA's 747-400 have been going through Cardiff for D checks and most C checks are still carried out at LHR.
Checks are carried out based on both cycles and age. If an aircraft is in regular use, cycles will be the dominant factor.
If an aircraft spends a long time sitting on the ground between ownerships and is not stored in dry conditions then age will be taken into account.
Again, if an aircraft has been the subject of many leases and has been used by different airlines, serviced by different agencies and generally used very hard, the C and D check cycle might be accelerated for that period of its life.
RayChuang From United States of America, joined Jun 2000, 7696 posts, RR: 5 Reply 22, posted (12 years 1 month 6 days 1 hour ago) and read 1258 times:
Actually, the more I think about it the more I think these planes are probably undergoing a D check overhaul.
I note the following: 1) the scaffolding surrounding the 747-400's is something you don't normally see on C checks and 2) they completely stripped the cockpit of all interior fittings including the instrument panel, something that's not common on C checks.