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!

*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.

Jobs

RTCA/DO-160D, section 22

RTCA/DO-160D, section 22

(OP)
anyone know the way of this test for
it is a pressure switch to monitor the hydraulic pressure. (like your home well water pump switch.) It is just a pair of on-off contacts. In old days, +28 VDC in, thru the switch out to the lamp, then go back to -28 VDC. (nowadays, maybe lower voltage and mA current to PC.)
How to test this PRESSURE SWITCH per RTCA/160D, section 22, waveform 3, table 22-3 cable bundle, level 4, 1500 V and 300A?
Thanks

RE: RTCA/DO-160D, section 22

?? aren't you supposed to test for damage or false signals?

"These test methods and procedures apply idealized wavefmms to verify the capability of equipment to withstand effects of lightning induced electrical transients. The criteria for equipment performance in the presence of lightning transients shall be defined in the applicable equipment specification."

TTFN
I can do absolutely anything. I'm an expert!
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers

RE: RTCA/DO-160D, section 22

(OP)
the WHOLE requirement

"4.4.4.1. Indirect Lightning Effects Testing
The Indirect Effects testing shall be performed per DO-160D Section 22 using Waveform 3, Table 22-3 cable bundles, Level 4, 1500 Volts or 300 Amperes."

thanks.

RE: RTCA/DO-160D, section 22

No, the whole requirement is the entire document, the testing cited has to be in the context of what might be at the beginning of the environmental testing section. Since your cited test doesn't distinguish, "perform during", "perform after", or "survive", then your system must meet its performance requirements specified earlier in your document during and after such a test.

TTFN
I can do absolutely anything. I'm an expert!
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers

RE: RTCA/DO-160D, section 22

(OP)
ok, let's say the pressure switch actuates at 100 psi, and close a circuit of 1 amp 28 VDC. with 100 megohm insulation resistance. we will verify that after the test.
BUT, how we physically do this section 22 test? you definitely will not flow 300 amp thru the switch.
thanks.

RE: RTCA/DO-160D, section 22

(OP)
160D, fig 22-7, LISN input impedance characteristics.
says not much to me with my little knowledge of it.
if i understand correctly, as an airplane hit by a lightning, the current goes from the cloud through the plane's skin and finally reaches ground. (or another cloud, or another part of the cloud.)
any thing inside the plane will subject to some V/A BY the induction.
then the V/A magnitude all depend upon how the equipment is located against the plane skin.
the para 4.4.4.1 tells nothing. the 1500V and 300A are the magnitude of the lightning, so test can not be performed to the pressure switch ALONE.
help?

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


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close