Reference Designators in Flight Assembly

MIL-D-1000.

I thought MIL-D-1000 got canceled.

OK, so look. That should tell you something about the my age.

I really didn't look it up. Maybe there's a reference to the latest spec.

Good Luck.

Oh, you must be 39, just like Jack Benny.

(Now deduce my age.)

Neither of us will ever see 39 again, I'll bet.

I'm going to have to preface my answers with, "back in my day", or some such.

I expect my odometer to roll over.

If I'd know I was going to live this long, I'da taken better care of myself.

you and me both. The world was supposed to end 10 years ago already - and now we have to wait until 2012.

Suddenly the post itself disappeared into aging, but thanks guys, welcome in my world, or should it be our world?

(Hence this avatar, freshly young)

We have to live longer so that we can take care of our family members and others who need us most.

I believe it is now called Mil-PERF-1000.

My internets tell me there is no such prf.

bhankii a LOT of really useful mil and fed specs have been canceled, but that does NOT mean they are not still used every day in industry inside and outside of government purchasing, and a lot of them don't have ISO, SAE or ASTM or ASME equivalents (many were picked up by one of these groups to keep the standard alive and the standard number was usually maintained in some similar fashion.). Some bonehead beaureaucrat decided that they didn't want the Military or Federal Government in the business of defining standards and they went and cancelled a buttload of them willy-nilly. then in a lot of cases, they had to go back and reactivate them when the realized the screw-up they made.

yes - but I'm looking for a binding requirement. If there is none, then I'm free to make something up.

thanks, I'll give it a look.

You win the gold ring - AMSE Y14.44 is exactly what I was looking for, and we had a copy in our library!

Thanks

There are many specs stating how to mark a reference designator (size, where, ink type, label type, color, etc.) but not many on defining what to mark.

IEEE 200-75 might be helpful as I found it referenced in several MIL specs/standards/guidelines/etc., but I couldn't find a free copy on line.

You should find this web site useful when looking for military specifications and standards: http://www.everyspec.com/

A few years ago when I worked for WDI, I looked and looked for THE reference designator standard. I never found it. I found may contradictions between and within the standards. A letter such as as "M1" could stand for meter #1, motor #1, module #1, monitor #1, etc. and "A1" could stand for amplifier#1, assembly #1, actuator #1, etc. I also found that an integrated circuit could be assigned IC1, U1, A1, or what ever seemed logical to the designer at the time.

I did find agreement between standards on the hierarchy. It is as stated in your original query. Within in Disney, the hierarchy began with PARK-ATTRACTION- and so on down to the component.

Good luck!

The base spec for DOD and other US gov't work is now ASME Y14.100. Everything else pretty much derives from this.

The kicker is that 14.100 and those referenced by it are RECOMMENDATIONS that can be modified by local and/or internal standards.

I've been fighting with the FAA reps that want drawings produced to ancient ANSI Y14 standards that effectively destroy the use-ability of many automated features of CAD systems.

It's gotten to the point that I, acting as a representative of my company, am writing the design and drafting specs based on ASME Y14.100 with deviations that allow for the ANSI Y14 automated features of my CAD system. The FAA reps will accept differences if we have them adequately documented. I suspect other agencies are operating similarly.

I'd like to strangle the idiots that got Mil-D-100 and Mil-D1000 canceled.

Oh, and we just spent about $700 for the new material spec that is now managed by the FAA called MMPDS-04. This spec replaced the old material spec MIL-HDBK-5J. Grrrrrrr.

Hooker

Military contracts my company bids on generally call out to mark reference designators in accordance with IEEE 200-1975 (Location Numbering Method) to identify and mark the location of electronic parts and equipment.

If you get another contract in with that reference, you might want to let the KO know that they are requiring you to adhere to an obselete spec. The newer version is the ASME spec ASME Y14.44-2008. I know existing contracts we have here still call out the older specs but new contracts should be written with the latest revision of the specs.

And yes, I know sometimes the customer doesn't want to hear it because that's the spec they always used before. We get those too.

Thank you for the advice.

I finally received an return email from our Electrical Engineer expert in this area and he confirms that some older contracts reference out of date specs; some reference specs that eventually get you to IEEE 200-1975 or ANSI Y32.16-1975; and the current specifications call for ASME Y14.44-2008.