-----Original Message-----
From: Mark E. Melton [mailto:mamelton@pop400.gsfc.nasa.gov]
Sent: Thursday, February 03, 2005 2:43 PM
To: cfransen@swales.com
Subject: RE: X-LAT MRR RFAs and Responses

Chris,

 

Thanks.  I feel this is sufficient to close the RFA.

 

Mark

____________________________________________

Mark E. Melton

GLAST Instruments Systems Engineer

Swales Aerospace

Bldg 12, Rm N210A

GSFC

(301) 286-7936 (V)

(301) 286-5717 (F)

-----Original Message-----
From: Chris Fransen [mailto:cfransen@swales.com]
Sent: Thursday, February 03, 2005 1:55 PM
To: Mark E. Melton
Cc: Paul Baird
Subject: RE: X-LAT MRR RFAs and Responses

Mark,

 

Re. Mark's Response to #3:   From the standpoint of stress-analysis of a 4-leg sling lift, one should assume sling load is carried by only two points (ie diagonally).  Depending on the adjustability provided in the Grid Perimeter Ring, it could apply there as well.    Looking back at my MRR notes, this concern involved whether LM could show positive margin for 2-pt LAT-only lift...not Observatory lift as Marc suggests by mentioning the work "Observatory".    We know by the 3,000 kg figure, that its a LAT-only lift!

 

I seem to recall that after I'd written this RFA, LM's analyst came into the room with the attached table in-hand (it wasn't part of the main package).  Since it shows they do have positive margin to this case (ie. 0.03 on yield, using no-test factor of safety), I think we can say the issue has been addressed.  I don't know if you (or Marc Campell) feels that a more-formal response is required, but I'm satisfied we don't have an issue.

 

Thanks,

C. D. Fransen
Senior Structural Analyst
Swales Aerospace Inc.
301-902-4689