User avatar
Bruce
Topic Author
Posts: 4937
Joined: Tue May 18, 1999 2:46 am

Another DC9 Question

Fri Jan 14, 2005 12:22 am

What is the life limit (hours/cycles) on the DC9 airframe? Can it be extended by service or is there a total end-of-life limit? Would a plane with 73,000 landings be considered nearing the end or does it have a long time to go? That seems like a lot to me - this plane was new in March, 1967.

I know NWA has no plans to fade out the DC9 but won't they have to get rid of the oldest ones due to age?

bruce
Bruce Leibowitz - Jackson, MS (KJAN) - Canon 50D/100-400L IS lens
 
Okie
Posts: 3683
Joined: Wed Jul 16, 2003 11:30 am

RE: Another DC9 Question

Fri Jan 14, 2005 12:56 am

I can just pass on what an acquaintance with the FAA told me once so you can take it with a grain of salt.

A 737 (did not specify which model) was estimated to have about 50,000 cycles with normal maintenance.
A DC-9 (again did not specify any model) was estimated at 100,000 cycles with normal maintenance.

He commented that the Douglas used a heavier gauge/different alloy of material on the skin of the aircraft.

Okie
 
SlamClick
Posts: 9576
Joined: Sun Nov 23, 2003 7:09 am

RE: Another DC9 Question

Fri Jan 14, 2005 1:44 am

Don't believe there is a limit on hours or cycles. I believe that it is more, on-condition. There are other "aging fleet" issues that will probably drive them out of the skies before the sheet metal does. Wiring, tubing, and all of the things that deteriorate are likely to make them less and less desirable to the operators. I would not be surprised to see inspection schedules become more and more expensive, not only in terms of the actual procedure, but for frequency and the downtime on the airframe.

I used to read the FAA's MRR Summaries for the DC-9 and some issues, maybe 70% of the items detailed there were corrosion and cracks found in C and D checks. (at Republic and Eastern, mainly)

View Large View Medium
Click here for bigger photo!

Photo © Bob Garrard
View Large View Medium
Click here for bigger photo!

Photo © AirNikon



I've also been told that when Sunworld ceased operations one of their DC-9-14 airframes was one of the top two or three for time/cycles and, for that reason, it was re-acquired by the factory to be tested to destruction. Can anyone confirm that? (Maybe N9102)

View Large View Medium
Click here for bigger photo!

Photo © Brian Peters


Happiness is not seeing another trite Ste. Maarten photo all week long.
 
miamiair
Posts: 4249
Joined: Thu Jul 15, 2004 9:42 pm

RE: Another DC9 Question

Fri Jan 14, 2005 3:43 am

There is NOT any time/cycle limitation on the airframe. As long as it is properly maintained in accordance with its instructions for continued airworthiness, conforms to the type design it can keep flying until it is economically prohibitive. The original Design Service Objective (DSO) for the 707 I believe was 20,000 cycles. There are a couple of 707s that were flying for Boeing Aerospace Operations (Teaching E-3B Sentry AWACS Pilots) that had over 102,000 cycles.

Just an observation after working on Boeings, Lockheed, Douglas/McDonnell Douglas & Airbus; the Douglas airplanes are tanks, built tough and it shows to this very day.
Molon Labe - Proud member of SMASH

Who is online

Users browsing this forum: Aab498, airxliban and 1 guest

Popular Searches On Airliners.net

Top Photos of Last:   24 Hours  •  48 Hours  •  7 Days  •  30 Days  •  180 Days  •  365 Days  •  All Time

Military Aircraft Every type from fighters to helicopters from air forces around the globe

Classic Airliners Props and jets from the good old days

Flight Decks Views from inside the cockpit

Aircraft Cabins Passenger cabin shots showing seat arrangements as well as cargo aircraft interior

Cargo Aircraft Pictures of great freighter aircraft

Government Aircraft Aircraft flying government officials

Helicopters Our large helicopter section. Both military and civil versions

Blimps / Airships Everything from the Goodyear blimp to the Zeppelin

Night Photos Beautiful shots taken while the sun is below the horizon

Accidents Accident, incident and crash related photos

Air to Air Photos taken by airborne photographers of airborne aircraft

Special Paint Schemes Aircraft painted in beautiful and original liveries

Airport Overviews Airport overviews from the air or ground

Tails and Winglets Tail and Winglet closeups with beautiful airline logos