GLAST LAT ProjectMarch 08, 2004 Page 1 ACD Installation, Post LAT CDR Response to GLAST LAT CDR RFA Number 13: MGSE Detailed Dimension Study [for ACD Installation] –A) Perform detailed dimension study. Crane hook height appears inadequate for installation of ACD See slides 3 and 4 –B) Provide information on the clean room entrances and clearances that will exist when equipment (including GSE) is brought in and out. Large, Double Door to Class 100K Crane Room is 111” [ 2,819 mm ] wide by 108” [ 2,743 mm ] high Small, Single Door to Class 100K Clean Room is 59” [ 1,499 mm ] wide by 79” [ 2,007 mm ] high The LAT on the Integration Stand, the Low Profile ACD Integration Stand and the 8’ x 8’ x 6.2’ tall ACD Dolly fits in Rm 104; See slide 5

GLAST LAT ProjectMarch 08, 2004 Page 2 ACD Installation, Post CDR Concept SLAC will develop a low profile integration stand When ready for ACD mate operations, the LAT will be lifted from the Rotation / Support Stand and set onto the low profile stand Next slide shows available clearances The “available clearances” assume an 8” [ 203 mm ] high spreader –Current welded joint analyses indicate that the spreader needs to be at least 8” high (i.e., Rectangular Structural Steel Tubing that is also 6” wide and 0.375” thick) –13.6” [ 345 mm ] of room to operate crane along Z (vertical)

GLAST LAT ProjectMarch 08, 2004 Page 3 ACD Installation, Low Profile Integration Stand 20.0” [ 508 mm ] 51.8” [ 1,316 mm ] 6.0” [ 153 mm ] 97.7” [ 2,482 mm ] Crane Lift Block at high point 134” [ 3,403 mm ] 36.3” [ 922 mm ] Low Profile ACD Integration Stand ACD LAT 4x4 Lift Spreader (8” [203 mm] Height), 6” [152 mm] Clearance between Spreader and ACD, Plus Crane Scale requires 36”

GLAST LAT ProjectMarch 08, 2004 Page 4 LAT With ACD To / From Rotation Stand Crane load block maximum height is 134 inches [ 3,403 mm ] (Hook removed) No problem moving LAT to / from integration stand 13.6” [ 345 mm ] Operable Height for Crane, with Scale in the loop ¾” OTS 316 CRES Turnbuckles Rated for 5,200 lbs each 6.0” [ mm ] 53.0” [ 1,346 mm ] 120.4” [ 3,058 mm ] ACD Installed 29.2” [ 742 mm ] Crane Lift Block attaches directly to Crane Scale that attaches directly to Lift Spreader Post 8,856 lbs Crane Load Block

GLAST LAT ProjectMarch 08, 2004 Page 5 LAT With ACD To / From Rotation Stand ACD Low Profile Integration Stand ACD on 8’ by 8’ Dolly All Required Hardware for ACD Integration Fits in Room ACD Low Profile Integration Stand and its Dolly are within Crane’s Pick Zone ACD on Dolly easily fits through Double Doors ( LAT May require bagging during door opening events) Integration Stand is Placed to Allow Range of Motion for PAPs