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After A D-Check, Does The Aircraft Return 'Like New'?  
User currently offlineNWA1978 From United States of America, joined Dec 2004, 66 posts, RR: 0
Posted (9 years 1 month 5 days 3 hours ago) and read 17705 times:

I have always been curious to know, when an airline does a D-check, is the aircraft brought back into like new condition? I dont see alot of images of the d-checks so I dont really know. Is it something like this that allows NWA to fly the DC-9/DC-10 so long? I know it is very expensive and time consuming so I was just curious what all was done. From the few images I have found, the interiors were stripped. Thanks for any help you can provide!

29 replies: All unread, showing first 25:
 
User currently offlineTod From Denmark, joined Aug 2004, 1729 posts, RR: 3
Reply 1, posted (9 years 1 month 5 days 2 hours ago) and read 17658 times:

Quoting NWA1978 (Thread starter):
when an airline does a D-check, is the aircraft brought back into like new condition?

Almost

For all the nitty gritty move over to tech-ops.

Tod


User currently offlineJoness0154 From United States of America, joined Nov 2005, 667 posts, RR: 0
Reply 2, posted (9 years 1 month 5 days 2 hours ago) and read 17628 times:

Its pretty much a like new condition.

On a D-check, done once about 5-6 years, is where everything removable is removed from the plane, including interior, control surfaces, fuel tanks, instrument panel, engines, everything you can think. Pretty much down to the skin of the A/C. Worn items are replaced, and time limited items too, etc and then the A/C is put back together

Takes anywhere from 30-45 days or longer.



I don't have an attitude problem. You have a perception problem
User currently offlineEMBQA From United States of America, joined Oct 2003, 9364 posts, RR: 11
Reply 3, posted (9 years 1 month 5 days 2 hours ago) and read 17594 times:

D-check from what I see are a thing of the past with newer aircraft. The C-check has become the driving inspection now a days. The C-check has been broken down to more intense levels such as C, C1, C2..Also, many aircraft are now driven by cycles such as a 12K, 30K inspections.


"It's not the size of the dog in the fight, but the size of the fight in the dog"
User currently offlineHAWK21M From India, joined Jan 2001, 31712 posts, RR: 56
Reply 4, posted (9 years 1 month 4 days 23 hours ago) and read 17468 times:

Quoting Joness0154 (Reply 2):
On a D-check, done once about 5-6 years

Which Type are you qouting here.Isn't 5-6 yrs too frequent.

Out here as EMBQA mentioned.Check C inspections cover part of Check D,thus reducing the Quantity of Work when the Check D arrives.

regds
MEL



Think of the brighter side!
User currently offlineNonfirm From United States of America, joined Sep 2005, 434 posts, RR: 0
Reply 5, posted (9 years 1 month 4 days 22 hours ago) and read 17451 times:

Quoting EMBQA (Reply 3):
D-check from what I see are a thing of the past with newer aircraft. The C-check has become the driving inspection now a days. The C-check has been broken down to more intense levels such as C, C1, C2..Also, many aircraft are now driven by cycles such as a 12K, 30K inspections

are you talking more about a phase maint program.we have different type of c checks c-1 , 2, 3 ext maybe with a cpc program type check.but we still go through the k check phase for the md's and the d phase for the 737.


User currently offlinePhilSquares From , joined Dec 1969, posts, RR:
Reply 6, posted (9 years 1 month 4 days 20 hours ago) and read 17397 times:

Quoting Joness0154 (Reply 2):
On a D-check, done once about 5-6 years,

How about every 10 years or so. For the 787 it's 15 years.


User currently offlineJoness0154 From United States of America, joined Nov 2005, 667 posts, RR: 0
Reply 7, posted (9 years 1 month 4 days 19 hours ago) and read 17382 times:

Quoting PhilSquares (Reply 6):

Alright, well that makes sense. I assume that newer designs are built to last longer before D checks.

The sheet my instructor handed out in class today stated D checks normally done every 5-6 years or so, I guess it could be a little outdated?

Or maybe they replaced the old D check with a C check, and extended the life of the D check...?



I don't have an attitude problem. You have a perception problem
User currently offlineDALMD88 From United States of America, joined Jul 2000, 2614 posts, RR: 14
Reply 8, posted (9 years 1 month 4 days 17 hours ago) and read 17355 times:

At DL our MD88 fleets get D check at 6 years. I think the 737 classics were the same.

User currently offlineHAWK21M From India, joined Jan 2001, 31712 posts, RR: 56
Reply 9, posted (9 years 1 month 4 days 12 hours ago) and read 17300 times:

Quoting DALMD88 (Reply 8):
At DL our MD88 fleets get D check at 6 years. I think the 737 classics were the same.

What about hrs & Calender period.I would think the hrs would catch up faster,depending on its usage.
B737 its 16,000hrs.
regds
MEL



Think of the brighter side!
User currently offlineTobi3334 From Germany, joined Sep 2004, 146 posts, RR: 3
Reply 10, posted (9 years 1 month 2 days 14 hours ago) and read 17126 times:

Last year I have been on BA's 744 G-BNLJ which was produced around 1990 and I was wondering about the condition of some parts.

Of course ... the cabin was clean, but while I was hanging around in the rear lavatory area I noticed how worn and scruffy the ceiling and the rubber isolation around the main door was.

Certainly this has nothing to do with "safety" but acutally I thought that also these parts will be replaced on D-Checks.


User currently offlineHAWK21M From India, joined Jan 2001, 31712 posts, RR: 56
Reply 11, posted (9 years 1 month 2 days 13 hours ago) and read 17121 times:

Quoting Tobi3334 (Reply 10):
Certainly this has nothing to do with "safety" but acutally I thought that also these parts will be replaced on D-Checks

Those could be done in a much Earlier check.
regds
MEL



Think of the brighter side!
User currently offlineTod From Denmark, joined Aug 2004, 1729 posts, RR: 3
Reply 12, posted (9 years 1 month 2 days 10 hours ago) and read 17062 times:

Quoting Joness0154 (Reply 2):
30-45 days or longer.

Sometimes alot longer.

Availibility of replacement parts can drag things way out.
It was rather exceptional, but I saw a 744 sit for over six months waiting for D check parts last year.

Tod


User currently offline320tech From Turks and Caicos Islands, joined May 2004, 491 posts, RR: 5
Reply 13, posted (9 years 1 month 2 days 5 hours ago) and read 17020 times:

Speaking only of the A320, we do phased C checks. Every six months or so, the airplane comes in and we do one third of an inspection. The normal C check interval for an A320 is eighteen months. In most airlines, where C's are done as complete, five or so day checks, the first one is a 1C or C1 (depending on the airline, same thing), second is 2C or C2, etc. A C4 (also C8, C12, C16, etc) check is a "mini-D" - it has more structural inspections. A C check can be thought of as mostly a mechanical check. You're looking at the operation of components, wear, etc, and not really at the frames, stringers, ribs, etc.

The interval for a D check is seven years for the first one, then five years after that (though these check intervals may have been extended recently, not sure).

There are also timed inspections - five year items, ten year items - and by hours or cycles. Generally these are also structural checks.

As much as we'd like to think so, an airplane just out of a D check is not really like new. Many wear items - control bearings, for example - will get replaced, and structural damage will be repaired. But in most cases, you still have the same old aluminium under the paint.



The primary function of the design engineer is to make things difficult for the manufacturer and impossible for the AME.
User currently offlineHAWK21M From India, joined Jan 2001, 31712 posts, RR: 56
Reply 14, posted (9 years 1 month 1 day 12 hours ago) and read 17015 times:

Quoting 320tech (Reply 13):
As much as we'd like to think so, an airplane just out of a D check is not really like new. Many wear items - control bearings, for example - will get replaced, and structural damage will be repaired. But in most cases, you still have the same old aluminium under the paint.

Is Patch work common on an A320,or is there a different repair method.
regds
MEL



Think of the brighter side!
User currently offline320tech From Turks and Caicos Islands, joined May 2004, 491 posts, RR: 5
Reply 15, posted (9 years 1 month 1 day 10 hours ago) and read 16981 times:

I haven't seen any big patches, like on the 737 upper fuselage. I've only seen patches where someone beat the airplane (baggage handlers, jetways, etc).


The primary function of the design engineer is to make things difficult for the manufacturer and impossible for the AME.
User currently offlineHAWK21M From India, joined Jan 2001, 31712 posts, RR: 56
Reply 16, posted (9 years 1 month 1 day 9 hours ago) and read 16953 times:

Quoting 320tech (Reply 15):
I haven't seen any big patches, like on the 737 upper fuselage. I've only seen patches where someone beat the airplane (baggage handlers, jetways, etc).

Any Pic of a Patch repair Job on an A320.
regds
MEL



Think of the brighter side!
User currently offline320tech From Turks and Caicos Islands, joined May 2004, 491 posts, RR: 5
Reply 17, posted (9 years 1 month 1 day 5 hours ago) and read 16897 times:

I don't have any. Seems to me any good close up of a pax or cargo door is likely to show something. I looked through the airliners.net database, and on Google Images, but couldn't find any. They are done pretty much the same as on a 737, though.


The primary function of the design engineer is to make things difficult for the manufacturer and impossible for the AME.
User currently offlineHAWK21M From India, joined Jan 2001, 31712 posts, RR: 56
Reply 18, posted (9 years 1 month 17 hours ago) and read 16778 times:

Quoting 320tech (Reply 17):
They are done pretty much the same as on a 737, though.

I don't know if its coincidence,But out here I've strugled to find a Big patch on an A320,but found many of B737s.Even the Paint finish of the A320 looks more smoother than a B737.Is the Material of the Skin different.
regds
MEL



Think of the brighter side!
User currently offline320tech From Turks and Caicos Islands, joined May 2004, 491 posts, RR: 5
Reply 19, posted (9 years 1 month 9 hours ago) and read 16721 times:

.Is the Material of the Skin different.

Not that different, I'm sure. Probably just the A320 is somewhat newer than the 737, so fewer opportunities to be beaten. I've seen lots of patches, some of them pretty ugly. Just never thought to take a photo of one.



The primary function of the design engineer is to make things difficult for the manufacturer and impossible for the AME.
User currently offlineHAWK21M From India, joined Jan 2001, 31712 posts, RR: 56
Reply 20, posted (9 years 4 weeks 1 day 22 hours ago) and read 16632 times:

Quoting 320tech (Reply 19):
I've seen lots of patches, some of them pretty ugly. Just never thought to take a photo of one

In case you notice one.Post it.
Out here the B737NGs & A320s are quite popular,But The Repair work on the A320 seems much smoother from the Outside.
regds
MEL



Think of the brighter side!
User currently offlineHikesWithEyes From United States of America, joined Jan 2004, 816 posts, RR: 7
Reply 21, posted (9 years 4 weeks 17 hours ago) and read 16550 times:

It is not uncommon for aircraft coming out of D-checks have some "bugs"
that take a few weeks of revenue service before they are identified
and repaired.



First, benzene in my Perrier, and now this!
User currently offlineHAWK21M From India, joined Jan 2001, 31712 posts, RR: 56
Reply 22, posted (9 years 4 weeks 12 hours ago) and read 16524 times:

Quoting HikesWithEyes (Reply 21):
It is not uncommon for aircraft coming out of D-checks have some "bugs"
that take a few weeks of revenue service before they are identified
and repaired.

A test flight Post Check D will help judge.
regds
MEL



Think of the brighter side!
User currently offlineHikesWithEyes From United States of America, joined Jan 2004, 816 posts, RR: 7
Reply 23, posted (9 years 4 weeks 6 hours ago) and read 16489 times:

Quoting HAWK21M (Reply 22):
A test flight Post Check D will help judge.
regds
MEL

I agree, but my experience has been that there are always some
little problems that keep surfacing for a few weeks, if not longer.



First, benzene in my Perrier, and now this!
User currently offlineHAWK21M From India, joined Jan 2001, 31712 posts, RR: 56
Reply 24, posted (9 years 3 weeks 6 days 13 hours ago) and read 16406 times:

Quoting HikesWithEyes (Reply 23):
I agree, but my experience has been that there are always some
little problems that keep surfacing for a few weeks, if not longer.

Thats true.Considering the Amount of work done.It does take time to Settle down.
regds
MEL



Think of the brighter side!
25 Airfoilsguy : D check sounds very costly. Anyone know the cost?
26 Tod : I don't have the numbers here at home, but I do know that the can vrie greatly depending on what you find when you rip the plane apart and how despar
27 HAWK21M : As the Dismantling continues during the check & Structures are Inspected as required.Problems creep up for which at times replacement is required,Thi
28 DALMD88 : I've seen MD88 costs of about 1M to about 1.2M. We rarely ran out of that range. If the program for the aircraft is well run there will not be many bi
29 A/c train : Most repairs ive been involved with on the 320 airframe have been 2024-T3 material, most rivets used need to be cooked before use though ! 757's ive d
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