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EVA 5: Batteries, FGS, NOBL. Ed Nelan May 21, 2009. Batteries: original batteries are 14 years older than design lifetime. new batteries are an improved design EVAs 2 & 5. Batteries: replacement batteries have passed Aliveness & Functional Tests. FGS2: - PowerPoint PPT Presentation
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EVA 5: Batteries, FGS, NOBLEd Nelan
May 21, 2009
Batteries:• original batteries are 14 years older than design lifetime.• new batteries are an improved design• EVAs 2 & 5
Batteries:• replacement batteries have passed Aliveness & Functional Tests
FGS2:• FGS2 was replaced due to failing LEDs on its star selector servos, which put guide star acquisitions at risk.
• Replacement FGS2 successfully passed it Aliveness and Functional Test
• We now have:• FGS3 (original)• FGS2 (new)• FGS1 (1997)
John Grunsfeld removes FGS2
FGS2 Aliveness Test:
High Voltage On, PMT dark counts > 0
Courtesy ofGoodrich
FGS2 Functional Test, part 1:
• fine lock acquisition of Internal Test Source (ITS)• demonstrates interferometer functions
“half” S-curve typically seen infine lock acquisition
Courtesy ofGoodrich
FGS2 Functional Test, part 2:
• move AMA motors• +8 steps motor1• - 8 steps motor2
• observe ITS position in finelock
• move AMA motors back• - 8 steps motor1• +8 steps motor2
• observe ITS position in finelock
• observed shift of ITS position verifies AMA functions
• test was a complete success.
Upcoming FGS SMOV activities
• Guide star acquisition tests (FGS1 & 3)– May 22
• FGS2 ITS measurement– May 22
– Checks for short term stability (compare to FT)
• FGS1r Trans Mode observations of AMA target stars– May 31
• FGS2 AMA adjustments– June 1 through June 9
Grunsfeld & Feustel installed New Outer Blanket Lining (NOBL) on bays 5, 7, & 8
EVA 5 completed the SM4 manifest