Aerosvit
Topic Author
Posts: 109
Joined: Mon Feb 23, 2004 6:59 am

What's a D check and what happens when it does happen?

Sun Aug 29, 2004 10:43 am

What's a D check and what happens when it does happen? And are there any other checks like that?
Clava Ykraini
 
EMBQA
Posts: 7798
Joined: Sat Oct 25, 2003 3:52 am

What's a D check and what happens when it does happen?

Sun Aug 29, 2004 11:00 am

Well....every manufacture and airframe has a different Check program. The 'D' Check is the highest level of check and in most cases, the airframe is stripped of all parts, sections are X-Rayed or extensive NDT tests are performed, indepth inspections are performed, the interior is completely gutted and some structural items are even replaced.
"It's not the size of the dog in the fight, but the size of the fight in the dog"
 
AirframeAS
Posts: 9811
Joined: Thu Feb 05, 2004 3:56 pm

What's a D check and what happens when it does happen?

Sun Aug 29, 2004 3:50 pm

In my experience at AS...a D-check was pretty much removal of everything on the a/c. This included structural inspections. Sometimes on a D-check, some things dont get removed. These checks lasts anywhere between 30-60 days. I remember doing a D-Check on N767AS back in 1998 and it was a 60 day check..it was BORING!!!

Disclaimer....I was a Technician Helper with AS at that time, so things that AS are done differently now, I think....
A Safe Flight Begins With Quality Maintenance On The Ground.
 
320tech
Posts: 489
Joined: Mon May 17, 2004 11:38 am

What's a D check and what happens when it does happen?

Mon Aug 30, 2004 2:33 am

A D check would be primarily a structural inspection, usually done every five or six years, though it could be longer (depends on the aircraft type). It involves checking all parts of the aircraft that aren't routinely inspected during C checks. Flaps, spoilers, slats, landing gear, flight controls are all removed to give access to areas normally out of sight. Wing-fuselage fairings are removed, fuel tanks opened, etc, etc.
The primary function of the design engineer is to make things difficult for the manufacturer and impossible for the AME.
 
avioniker
Posts: 1099
Joined: Tue Jan 01, 2002 5:38 am

What's a D check and what happens when it does happen?

Tue Aug 31, 2004 12:22 am

Once upon a time the D Check was done after the sixth C. This could be anywhere between every six to ten years (ballpark).
There is an E Check as well but on a 747 this would take a minimum of a year and there isn't an operator around with that kind of money any more. It's cheaper to buy a newer airframe than do all the "zero timing" that would be involved.
One may educate the ignorance from the unknowing but stupid is forever. Boswell; ca: 1533
 
777ER
Crew
Posts: 9864
Joined: Fri Dec 19, 2003 5:04 pm

What's a D check and what happens when it does happen?

Tue Aug 31, 2004 10:10 am

When I visited the NZ maintaince hanger in CHC a few weeks ago, there were two QF B733s have a D check done. One of the 733s was resting on stands and I was told that everything inside has been taken out and getting checked. I was not allowed onboard this B733 as it was unsafe. The other B733 that was having a D check done I was allowed to board as it was about 2 weeks into its D check. All the cockpit instruments and seats, engines, half the passenger floor, passenger seats, doors and cargo doors had been removed and were being inspected. I was told that everything is removed from the plane and everything little inch of the plane is inspected. Its basically like looking for a needle in a hay stack.
Head Forum Moderator
moderators@airliners.net for all Moderator contact
 
LAXinYYZ
Posts: 41
Joined: Mon Aug 09, 2004 11:03 am

What's a D check and what happens when it does happen?

Tue Aug 31, 2004 11:42 am

Greetings,
When I lived in California I had friends who worked for Lucas Aviation in Santa Barbara. They talked about their company’s ability to do check on a 747 that only a handful of companies were certified to do. They would tear the 747 down to the point where they would have to put the aircraft in a jig to keep it from shifting and/or collapsing. Would this be the E check or just a D check.
"Don't trust any statistic that you didn't falsify yourself"
 
Imonti
Posts: 399
Joined: Tue Jun 15, 2004 4:49 am

RE: What's A D Check And What Happens When It Does Happen?

Fri Sep 03, 2004 1:00 am

About 5 years ago I toured SAA maintenance hangers, I got to see a Lufthansa 747 in for a D-Check I think it was a cargo plane. Wow almost all of its paint had been sanded off as well. But what was really interesting was to see the "holes" in the wing and that a guy can clmaber inside with a torch and inspect the entire thing. It was really really cool to see it.
 
air2gxs
Posts: 1443
Joined: Mon Jun 18, 2001 1:29 pm

RE: What's A D Check And What Happens When It Does Happen?

Fri Sep 03, 2004 1:05 am

Those holes in the wing are fuel tank access doors. Even though you can do some inspection from inside the tank, most of the inspection of the wing structure is done using X-rays and other non-destructive testing (NDT) methods. The sealant on the tank surfaces and fasteners pretty much prohibit any cursory inspection of the underlying structure. By the way, I prefer to use the word flashlight rather than torch when dealing with fuel tanks.
 
320tech
Posts: 489
Joined: Mon May 17, 2004 11:38 am

RE: What's A D Check And What Happens When It Does Happen?

Fri Sep 03, 2004 5:03 am

The connotation of the word "flash" in a fuel tank is not so great, either  Smile.
The primary function of the design engineer is to make things difficult for the manufacturer and impossible for the AME.
 
Dalmd88
Posts: 2412
Joined: Fri Jul 28, 2000 3:19 am

RE: What's A D Check And What Happens When It Does Happen?

Fri Sep 03, 2004 7:19 am

The proper terminology would be 'fuel tank entry approved light'. I prefer the big fluorescent drop light type.
 
MD11Engineer
Posts: 13916
Joined: Sun Oct 26, 2003 5:25 am

RE: What's A D Check And What Happens When It Does Happen?

Fri Sep 03, 2004 8:08 am

If I can, I´ll leave the tankdiving to somebody else  Wink/being sarcastic !

Jan
Je Suis Charlie et je suis Ahmet aussi
 
dl1011
Posts: 315
Joined: Tue May 18, 1999 6:42 am

RE: What's A D Check And What Happens When It Does Happen?

Fri Sep 03, 2004 4:00 pm

Tankdiving. One of the few times it pays to be "calorically challenged!"
 
320tech
Posts: 489
Joined: Mon May 17, 2004 11:38 am

RE: What's A D Check And What Happens When It Does Happen?

Fri Sep 03, 2004 9:30 pm

I beg to differ. If you're not calorically challenged, you may not even have to go in there.  Smile
The primary function of the design engineer is to make things difficult for the manufacturer and impossible for the AME.

Who is online

Users browsing this forum: No registered users and 9 guests