From: Jim Ryan [james.m.ryan@nasa.gov]
Sent: Tuesday, May 25, 2004 11:59 AM
To: mmelton@swales.com
Cc: pbaird@swales.com; mphan@mscmail.gsfc.nasa.gov
Subject: RE: GLAST Project RFA Responses for your Review
Mark,

Per the independent review conducted by Swales, GLAST LAT CDR # 12 can be closed. Paul Baird provided me the summary below.

Jim Ryan

At 11:14 AM 5/21/04 -0400, you wrote:

Jim,

The following steps summarize the activities undertaken to verify the SLAC Grid stress report:

1. Reviewed initial stress report dated (01/23/04) and found it difficult to follow due to insufficient documentation of load cases used.
2. Asked for a margin summary table and further clarification of load cases (date: 01/28/04 per Chiachung comments on Grid stress report)
3. Received margin summary table but little clarification of load cases (received 02/23/04 through John Ku email)
4. Decided to perform independent stress assessments using latest load results instead of asking SLAC to make further improvements to the stress report (this was done in part in an attempt to off-load SLAC due to their limited manpower).
5. Completed independent assessments on 03/08/04 (see memo SAI-TM-2477, attached) and found all margins acceptable except for the EMI skirt/grid shear joint.
6. SLAC subsequently showed this joint to be non alignment critical and positive margins result from joint friction shear capability (see attached analysis package received on 04/12/04 from John Ku).

-----Original Message-----
From: Jim Ryan [mailto:james.m.ryan@nasa.gov]
Sent: Thursday, May 20, 2004 9:28 AM
To: lmignosa@swales.com; pbaird@swales.com; James.P.Loughlin@nasa.gov; mphan@mscmail.gsfc.nasa.gov
Subject: Fwd: GLAST Project RFA Responses for your Review

Larry, Paul, Jim, Minh,

I am OK with responses to PDR #45 and CDR #13. However, I would like to know that Code 542 and/or Swales has independently looked at the stress report of the Grid and interfaces requested in CDR #12. It is stated that a CD with the full stress report will be forwarded to me. In my opinion, it is not enough to say that the Project has approved the report (I am not sure what this Project approval really means). The last I recall is that a large amount of information had been sent to Swales for review, but that the information was fragmented, did not have a good index, and it was unclear if the latest loads had been used. A summary table of minimum margins using latest loads for Grid and critical interfaces should be provided. At lease several of these calculations should be thoroughly checked for proper methodology. If any of you have more information, please weigh in on this.

Thanks,
Jim Ryan

Reply-To: <mmelton@swales.com>
From: "Mark E. Melton" <mmelton@swales.com>
To: "Jim Ryan" <james.m.ryan@nasa.gov>, "Mark Goans" <Mark.D.Goans@nasa.gov>
Cc: "Kevin Grady" <Kevin.Grady@gsfc.nasa.gov>,
   "Al Vernacchio" <Avernacc@pop400.gsfc.nasa.gov>,
   "Jack Leibee" <Jack.E.Leibee@nasa.gov>,
   "Bernie Graf" <Bernard.S.Graf@nasa.gov>
Subject: GLAST Project RFA Responses for your Review
Date: Wed, 19 May 2004 16:01:35 -0400
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Importance: Normal

Jim,

Attached are 3 responses to RFAs you wrote at the GLAST LAT PDR and LAT CDR. Mark Goans, the Code 300 Review chair, has asked that all Project approved RFA responses be reviewed and approved by the originators prior to official submittal to him.

Please review the attached responses and let me know if they satisfactorily close the RFAs you generated. You can provide your approval or comments back to me and I will distribute them to the appropriate GLAST Project personnel.

Responses are attached for the following RFAs:

GLAST LAT PDR # 45
GLAST LAT CDR # 12, 13 (note: a CD with the full stress report will be forwarded to you along with #12)

Thank you for your review and response,
Mark
____________________________________________
Mark E. Melton
Systems Engineer
Swales Aerospace
Bldg 12, Rm N210A
GSFC
(301) 286-7936 (V)
(301) 286-5717 (F)

From: "Ku, John" <kuj@slac.stanford.edu>
To: "'Ichung Iweng'" <iweng@swales.com>
Cc: "'Paul Baird'" <pbaird@swales.com>,
        <cfransen@swales.com>
Subject: EMI Skirt to Grid Friction
Date: Mon, 12 Apr 2004 17:26:07 -0400
Message-ID: <26E3EC48949D134C94A1574B2C8946610327AB53@exchange2.slac.stanford.edu>
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Ichung,

I looked at the total shear capacity versus the net shear force (see last page of attachment). The margins weren't huge (MS=0.29), but positive. Considering that we are not alignment critical, this is acceptable to me...do you concur?

Let me know what you think.

Thanks,

John.

John Ku, Stellar Solutions, Inc., Cell#: 408.910.4139
NASA Goddard Space Flight Center, GLAST Mission System Engineer
We build too many walls and not enough bridges. -- Sir Isaac Newton

Reply-To: <iweng@swales.com>
From: "Ichung Weng" <iweng@swales.com>
To: "Ku, John" <kuj@slac.stanford.edu>
Cc: "'Paul Baird'" <pbaird@swales.com>,
        <cfransen@swales.com>
Subject: RE: EMI Skirt to Grid Friction
Date: Tue, 13 Apr 2004 07:38:53 -0400
Message-ID: <BOEIKHMGGFPDHJKPPADFOEOECBAA.iweng@swales.com>
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"urn:schemas-microsoft-com:office:office" xmlns:w = "urn:schemas-microsoft-com:office:word" xmlns:st1 = "urn:schemas-microsoft-com:office:smarttags">
John:
        Thank you for your effort to resolve this issue. I agree with this approach.

Ichung Weng

Swales Aerospace
Structural Analysis Group
Tel:(301)902-4773

-----Original Message-----
From: Ku, John [mailto:kuj@slac.stanford.edu]
Sent: Monday, April 12, 2004 5:26 PM
To: 'Ichung Iweng'
Cc: 'Paul Baird'; 'cfransen@swales.com'
Subject: EMI Skirt to Grid Friction

Ichung,

I looked at the total shear capacity versus the net shear force (see last page of attachment). The margins weren't huge (MS=0.29), but positive. Considering that we are not alignment critical, this is acceptable to me...do you concur?

Let me know what you think.

Thanks,
John.

John Ku, Stellar Solutions, Inc., Cell#: 408.910.4139
NASA Goddard Space Flight Center, GLAST Mission System Engineer
We build too many walls and not enough bridges. -- Sir Isaac Newton