From: Mark E. Melton [mmelton@swales.com]
Sent: Tuesday,
August 10, 2004 9:01 AM
To: Pat Hascall; Paul Baird; Chris
Fransen
Cc: Bernie Graf
Subject: FW: GLAST Project RFA
Responses for Originator Review
All,
Below are comments
from Jim Ryan regarding the 3 RFAs we recently sent to him. He has closed
CDR 16 and PDR 44; however, he did provide some comments to
them.
Also, he is
requesting further clarification on PDR 47 per his comments below. Pat,
please provide the additional clarification he is requesting (assuming his
information is correct) and resubmit the response to me. I will then pass
it on to Minh.
Thanks,
Mark
____________________________________________
Mark E. Melton
Systems Engineer
Swales Aerospace
Bldg 12, Rm N210A
GSFC
(301) 286-7936 (V)
(301) 286-5717 (F)
Mark,
CDR #16 OK as
is. However, it will be more difficult to get a good "tap test" on such a
large structure. Preferred method is low level sine sweep. In either
case, you need an appropriate level of instrumentation
(accelerometers).
PDR #44 OK as is. This AI was written
several years ago in an attempt to learn more about composite joint designs
early so that subsystem tests went more smoothly. With the maturity of the
design and the tests that have been done already, additional joint tests to
determine joint allowables is probably not necessary.
PDR
#47 Needs more clarification for Tower and Calorimeters.
Tower
It is my understanding after talking with Minh Phan, that
all flight tracker towers will see qual (1.25 times flight predicts) strength
levels during their sine sweep testing to flight levels, rather than do a
separate sine burst test for each. The Protoflight Tracker Tower will see
a protoflight level sine burst test and a protoflight level sine sweep
test.
Cal
It is my understanding that all of the composite
housings for the crystals will be subjected to strength qualification testing
(sine burst). They then will be assembled with all of their
electronics. A protoflight unit will see protoflight Sine burst testing
and sine sweep testing. The other flight units will see acceptance level
sine sweep testing, but do not require sine burst testing. This is because
all composite housings will have been previously strength qualified and that the
protoflight unit will be sine burst tested at qual levels. Response should
state this.
The rest of the response is OK.
Jim
Ryan
At 01:50 PM 8/6/04 -0400, you wrote:
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 # 44,
47
GLAST LAT CDR # 16
Thank you for your review and
response,
Mark<?xml:namespace prefix = o ns =
"urn:schemas-microsoft-com:office:office" />
____________________________________________
Mark E. Melton
Systems
Engineer
Swales Aerospace
Bldg 12, Rm N210A
GSFC
(301) 286-7936
(V)
(301) 286-5717
(F)