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Most Stressed Part  
User currently offlineMonocleman From United States of America, joined Apr 2001, 137 posts, RR: 0
Posted (13 years 2 months 1 week 6 days 23 hours ago) and read 1718 times:

In the opinion of the engineers and mechs and all others in the forum, what do you think is the single part of an a/c that is stressed the most? To me it seems to be the landing gear, because of all the restrictions put on them and the many subleties of them. But I may be proven wrong by all of you - lets see.

-Will

20 replies: All unread, jump to last
 
User currently offlineDE727UPS From United States of America, joined Nov 2000, 814 posts, RR: 13
Reply 1, posted (13 years 2 months 1 week 6 days 22 hours ago) and read 1619 times:

Without a doubt....the most stressed part in an aircraft is the pilot....

We have to put up with long duty periods, working at night, short rest times, schedules that are created by computers with no thought to quality of life, and maids in hotels that ignore the do not disturb sign. These stress factors...acting together....have caused more aircraft accidents than airframe parts ever will.

Now...I dare you to ask about aircraft fatigue....


User currently offlineAaron atp From United States of America, joined Mar 2000, 533 posts, RR: 2
Reply 2, posted (13 years 2 months 1 week 6 days 22 hours ago) and read 1609 times:

I would have to say that the items most likely to meet their designed stress level most often would be flaps and their tracks/operating mechanisms.

It's hard to compare absolute stress levels, but by the method
((actual stress encountered) / (design stress)) * 100% = relative stress

I would say that flaps are most likely to reach 100% of rated stress for two reasons.

1. It is easier to (e.g. pilots are more likely to) exceed the design flap speed than to make a hard landing that meets the gears design strength

which leads to

2. Gear are designed with a relatively higher margin between design stress and absolute stress than the flaps.


From a statics standpoint, just think about the enormous moments produced by multi-slotted flowler flaps at full extension, not to mention the drag component causing those moments.


aaron





User currently offlineTwotterwrench From , joined Dec 1969, posts, RR:
Reply 3, posted (13 years 2 months 1 week 6 days 21 hours ago) and read 1602 times:

OMG!! Pilot's stressed???? I... must.. bite.. my .... tongue... must... not ....succomb... to... flame....bait....work....12...days...a....month....and....call.....it....stress....bite...tongue....bite...tongue.....bite...tongue....ok..I am alright now..

User currently offlineL-188 From United States of America, joined Jul 1999, 29802 posts, RR: 58
Reply 4, posted (13 years 2 months 1 week 6 days 17 hours ago) and read 1586 times:

Trotterwrench....I think you need to put your signature on something........ Laugh out loud

I the connecting rods on a piston engine.



OBAMA-WORST PRESIDENT EVER....Even SKOORB would be better.
User currently offlineJT-8D From United States of America, joined Dec 2000, 423 posts, RR: 3
Reply 5, posted (13 years 2 months 1 week 6 days 17 hours ago) and read 1586 times:

Yea that 2 weeks a month work schedule must really be a bitch. Ive got it easy. I work nights, get 5-6 hours of sleep a day, and have a paycheck smaller then yours. I bit my tongue too. But my god, whining that loud has to be commented on..JT

User currently offlineMonocleman From United States of America, joined Apr 2001, 137 posts, RR: 0
Reply 6, posted (13 years 2 months 1 week 6 days 5 hours ago) and read 1544 times:

LOL Twotterwrench... but really, what do you think is the most physically stressed part?

User currently offlineTwotterwrench From , joined Dec 1969, posts, RR:
Reply 7, posted (13 years 2 months 1 week 6 days 5 hours ago) and read 1540 times:

As far as piston engines go, I would agree with L-188. The rods take a whoppin. I also think horizontal stabilizer attach points are a big area of stress. Lots of aging aircraft inspections focus on this area. Engine bearings in the hot section are subject to a lot of abuse. Thrust reversers. Brakes. Point is, all of these areas are stressed, but designed to withstand 150% of their normal loading in most cases.

User currently offline242 From United States of America, joined Oct 2000, 498 posts, RR: 1
Reply 8, posted (13 years 2 months 1 week 5 days 23 hours ago) and read 1520 times:

>>>maids in hotels that ignore the do not disturb sign. <<<

You should consider yourself lucky to get a hotel room. Many times I've been sent out to an outstation late at night to fix an aircraft only to have the company expect me to sleep on the plane.

It's guys like you, DE727UPS, that make me smile when I put an autopilot on MEL.


User currently offlineFlightSimFreak From United States of America, joined Oct 2000, 720 posts, RR: 0
Reply 9, posted (13 years 2 months 1 week 5 days 21 hours ago) and read 1510 times:

obviously the most stressed part of the airplane is my instructor (just kidding) I'de agree with you that the landing gear are probably the most stressed part of the plane... especially with my landings (Again just kidding)

User currently offlineFDXmech From United States of America, joined Mar 2000, 3251 posts, RR: 34
Reply 10, posted (13 years 2 months 1 week 5 days 17 hours ago) and read 1511 times:

The engine high pressure turbine blades during take off.
Interesting fact is approx 85% of engine failures occur during maximum power take offs.



You're only as good as your last departure.
User currently offlineMetroman From Australia, joined Apr 2007, 0 posts, RR: 0
Reply 11, posted (13 years 2 months 1 week 4 days 8 hours ago) and read 1478 times:

The arm rests on the crew seats. You would think that they were the most intrical part of the A/C the way the Flight Crews act when they break.

Seriously, my opinion? No other part is subjected to more NDT than the main wheels, nor does any other part have such a high rejection rate.


User currently offlineTwotterwrench From , joined Dec 1969, posts, RR:
Reply 12, posted (13 years 2 months 1 week 4 days 7 hours ago) and read 1475 times:

Don't forget cupholders, metroman! God forbid they should have to fly without one of these. I have actually had a pilot refuse to take an aircraft because there were no cup holders in the cockpit. Maybe he could get the maid to bring him some coffee, but only AFTER he takes down the do not disturb sign...

User currently offlineMetroman From Australia, joined Apr 2007, 0 posts, RR: 0
Reply 13, posted (13 years 2 months 1 week 4 days 1 hour ago) and read 1456 times:

Twotterwrench, that's true! I used to remove the cupholders from the cockpit when I wanted punish a particular "Bed Wetter", I mean pilot. That usually got their attention. Reinstallation fee was an apology and a six-pack of Moosehead.

User currently offlineDelta-flyer From United States of America, joined Jul 2001, 2676 posts, RR: 6
Reply 14, posted (13 years 2 months 1 week 4 days 1 hour ago) and read 1457 times:

Don't forget the skin! Inflates and deflates like a balloon once per cylce?

User currently offline242 From United States of America, joined Oct 2000, 498 posts, RR: 1
Reply 15, posted (13 years 2 months 1 week 4 days ago) and read 1453 times:

Cupholders? Why that's what the center control stand is for! It's not unusual to find a corrective action for an autopilot gripe that reads: "Found spilled coffee in autopilot control panel, none in stock, move to MEL log #xyxx, cat c, exp xx/xx/xx."

User currently offlineMetroman From Australia, joined Apr 2007, 0 posts, RR: 0
Reply 16, posted (13 years 2 months 1 week 4 days ago) and read 1450 times:

242,

So now you have doubled the workload of the 1st "Bed Wetter", I mean Officer. Now he has to hold two cups of coffee.

Shame on you, it is the duty of all A&P's to exhaust all possible means of corrective action to relieve the "Bed Wetters", I mean Flight Crews, of unnecessary work loads.


User currently offlineTwotterwrench From , joined Dec 1969, posts, RR:
Reply 17, posted (13 years 2 months 1 week 3 days 23 hours ago) and read 1446 times:

One time I got to work a gripe where the pilot claimed he couldn't slide his seat back. First I pulled out the apple core that looked about 6 weeks old. Then I removed what was left of the wadded up Playboy he left wedged behind his seat. Several soda cans, 2 coffee cups and a chew can came next. Then, I got to stick my fingers straight into his cup of chew spit he had neglected to throw away when he went home that day. Soooooo... I took the whole mess and dumped it out in his flight bag. And you fly boys wonder why we don't like you.. is it that hard to figure out????

By the way, after I got done playing maid for this trailer park slob, the seat worked just fine...


User currently offlineRodney King From , joined Dec 1969, posts, RR:
Reply 18, posted (13 years 2 months 1 week 3 days 23 hours ago) and read 1447 times:

Why can't pilots and mechanics just get along?

User currently offlineTwotterwrench From , joined Dec 1969, posts, RR:
Reply 19, posted (13 years 2 months 1 week 3 days 23 hours ago) and read 1446 times:

Rodney, why don't you take your crack pipe and shove it up your.....

User currently offlineMetroman From Australia, joined Apr 2007, 0 posts, RR: 0
Reply 20, posted (13 years 2 months 1 week 3 days 23 hours ago) and read 1446 times:

I can remember that there was a time when there was some mutual respect between MX and Pilots. Hate to admit it, but I've been in the industry awhile!!

We all used to work together to get the mission done. When an A/C was down for extened MX the Pilots and Flight Attendants use to come in and detail their A/C. Scrubbing headliners, shampooing uphostery and carpets, pulling acoustical windows out to clean inside and out. They had pride, it was their office. In turn, MX would would gather every gripe they had and correct them, along with what ever task that prevoked the A/C to be down in the first place.

Now-a-days you get what Twotterwrench has eluded too. Recently I was called out to an A/C because both engines wouldn't start. Upon gaining access to the cockpit I observed that both power levers were still in the fuel cut off position. I moved them to the start position, and guess what, normal start, thanks for the "Op's Check" Bed Wetter! No wonder you Bed Wetters are so stressed, you embarass your self so many times in front of the paying customers and blame MX for it!!


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