"Hole Forces Jet To Return To Miami International
MIAMI (CBS4) ―
A bit of a scare in the air for passengers aboard an American Air flight to Boston last Tuesday.
According to the National Transportation Safety Board, Flight 1640 left Miami International Airport at about 10 p.m. Approximately 30 minutes in the flight, the Boeing B-757-223 experienced a rapid decompression at about 31-thousand feet. Oxygen masks were deployed inside the aircraft as the captain declared an emergency and returned safely to Miami.
An inspection of the plane on the tarmac found a 1 foot by 2 foot hole just behind the forward door on the left side of the fuselage. The NTSB investigators are working to determine what caused that section of the plane to give way."
okie From United States of America, joined Jul 2003, 2822 posts, RR: 3
Reply 7, posted (3 years 4 months 1 week 6 days 14 hours ago) and read 20733 times:
Quoting motopolitico (Reply 6): The pic at the end of the thread looks like some sort of access hatch blew, very clean cut.
Both the AA and WN holes seem similar in appearance.
The WN incident was listed as metal fatigue at the edge where chemical milling had been used. Basically a sharp change in thickness vs a gradual change causing the stresses from pressurization cycles to be focused in very small area.
While we do not have access to the structural composition of the area involved in the AA incident for all intents and purposes seems to be a similar issue. Boeing may have to alter there procedures in chemical milling to get more of a feathered/larger radius for lack of a better term to distribute the stress out. I am not sure in how many areas Boeing uses the chemical milling on the fuselage skin.
If this ever gets serious enough to be a more than an occasional issue the FAA could slap down a definitive X number of cycles and the airframe goes to the scraper or non N registration.
B6JFKH81 From United States of America, joined Mar 2006, 2830 posts, RR: 7
Reply 8, posted (3 years 4 months 1 week 6 days 14 hours ago) and read 20699 times:
Quoting motopolitico (Reply 6): The pics on PPRuNe seem to be from an earlier WN incident. The pic at the end of the thread looks like some sort of access hatch blew, very clean cut.
Definitely, they were comparing the two. The pics of the the AA plane definitely do make it look like some type of patch or panel popped right off. I'm not familiar with the 757, anyone out there know of any access panels on the exterior above the L1??
"If you do not learn from history, you are doomed to repeat it"
blobusus From United States of America, joined Aug 2009, 35 posts, RR: 0
Reply 12, posted (3 years 4 months 1 week 6 days 13 hours ago) and read 19430 times:
Seems like the area around that door is a common place for this sort of thing to start. Didn't Aloha Airlines 243 cut loose around the same area? I guess it's logical with all the door action and the jetway bumping, and even the pax traffic through that opening.
Numero4 From Canada, joined Feb 2010, 260 posts, RR: 0
Reply 13, posted (3 years 4 months 1 week 6 days 12 hours ago) and read 18996 times:
Quoting okie (Reply 7): Boeing may have to alter there procedures in chemical milling to get more of a feathered/larger radius for lack of a better term to distribute the stress out. I am not sure in how many areas Boeing uses the chemical milling on the fuselage skin.
motech722 From United States of America, joined Aug 2003, 211 posts, RR: 2
Reply 15, posted (3 years 4 months 1 week 6 days 1 hour ago) and read 11922 times:
By far the best post I have read...The cabins of AA planes look so worn out and grubby that I can't help but wonder about the aircraft's structure.
I think we have hit it on the head folks, if the cabin interiors look grubby, the aircraft is unsafe to fly. I'm going to call and inform the NTSB that the reason American Airlines crashed in Jamaica last December was because of a grubby interior. Then, I'm going to march up to the head flight instructor at the local flight school and let him know that those old Pipers need to be grounded because there are tears in the seats and satined, orange carpet on the floor, therefore, the plane is unsafe to fly.
I think comedian Ron White said it best, "Next time you have a thought...let it go."
moman From United States of America, joined Aug 2004, 1054 posts, RR: 4
Reply 18, posted (3 years 4 months 1 week 5 days 20 hours ago) and read 11007 times:
Quoting markboston (Reply 14): The cabins of AA planes look so worn out and grubby that I can't help but wonder about the aircraft's structure.
Actually this is a very interesting quote. The average person does not know the maintenance procedures that commercial aircraft follow. There is a PR angle to this, and it would be reasonable for the average person to suspect that AA doesn't maintain it's aircraft because of the poor condition of the interiors. We on here know that's not true, but we're not the average persons, either.
Maybe this incident will get AA to speed up the interior refurbs.
7673mech From United States of America, joined Mar 2004, 687 posts, RR: 0
Reply 23, posted (3 years 4 months 1 week 5 days 16 hours ago) and read 10562 times:
The condition of an interior hardly has anything to do with the shape of the airplane.
Boeing has thousands of aircraft inservice with Chem - milled skins. They fly everyday.
There are several issues that seemingly need to be addressed:
Possbily revising times/cycles on certain inspections.
Review how previous repairs are affecting cracking in other areas of the aircraft. (This is very common. Install a new window belt and now cracks develop elsewhere as the strain is pushed elsewhere.)
Look at this aircraft in particular - where has it been - is there a jetway in the system where there is something under the padding hitting the skin?