×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

FAA/EASA Ultimate Test 3 seconds requirements : What is the rationale behind it!

FAA/EASA Ultimate Test 3 seconds requirements : What is the rationale behind it!

FAA/EASA Ultimate Test 3 seconds requirements : What is the rationale behind it!

(OP)
What is rationale behind holding structures under Ultimate load test for 3 seconds accroding to FAR 25 or EASA CS25 Aircraft certification requirements? In terms of structural failures, what is the 3 seconds no failure at ultimate load testing requirement meant to demonstrate? I have asked this question from 'seasoned' Airframers and no satisfactory response was provided, so I am hoping someone out there perhaps can give more insight behind this requirement.

RE: FAA/EASA Ultimate Test 3 seconds requirements : What is the rationale behind it!

It's to ensure it is a "static" test, rather than a dynamic test where the ultimate load is only applied for a millisecond and the dynamic strength increase is used to pass the test.

RE: FAA/EASA Ultimate Test 3 seconds requirements : What is the rationale behind it!

(OP)
Thanks SWComposite,
I have always thought that was the main reason but I thought there was more justification behind the 3 seconds.

RE: FAA/EASA Ultimate Test 3 seconds requirements : What is the rationale behind it!

It was could have something to do with the capabilities of the instrumentation systems long ago and the time required to record data ( or write down the data manually, long, long ago).

RE: FAA/EASA Ultimate Test 3 seconds requirements : What is the rationale behind it!

long ago someone picked a number ... count to three, that'll do.

and that became the standard ...

Quando Omni Flunkus Moritati

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources