LBT Q Eng/SW Review SHTRShutters/Seals/Mechanisms

2008-Jul-21LBT Q Engineering Review Highlights (Q2/2008) John Little reports pins are working well overall John Little reports pins are working well overall

2008-Jul-21LBT Q Engineering Review Progress (Q2/2008) Planning From Q1 Review: Planning From Q1 Review: Install rest of first batch of floating sockets (1 more installed, for 3 total) Install rest of first batch of floating sockets (1 more installed, for 3 total) Get 0704 back online √ Get 0704 back online √ Monitor shutter rails √ Monitor shutter rails √ Harass people about backup generator √ Harass people about backup generator √ Need to buy 480V 3ph genset Need to buy 480V 3ph genset

2008-Jul-21LBT Q Engineering Review Open Issues Technical Technical Failure Mode and Effects Analysis (FMEA) Failure Mode and Effects Analysis (FMEA) E-stop failure lead to inability to close shutter doors and vents (Issue 1419) E-stop failure lead to inability to close shutter doors and vents (Issue 1419) Power Failure Power Failure How to unlatch from the open position and close door How to unlatch from the open position and close door Failsafe latch pins? Failsafe latch pins? Drive failure Drive failure Motor/mechanical failure Motor/mechanical failure If we had a mirror cover, are the consequences of failure less severe? If we had a mirror cover, are the consequences of failure less severe? Shutter Rails Shutter Rails Upper left rail may have an alignment problem Upper left rail may have an alignment problem Lower left rail bogies misaligned Lower left rail bogies misaligned Leaky Seals (IssueTrak 944) Leaky Seals (IssueTrak 944) Is flexure of the enclosure causing problems? Is flexure of the enclosure causing problems? Snowmelt ducting doors need repair Snowmelt ducting doors need repair Schedule Schedule Time Time Financial Financial Unknown Unknown Resource Resource Mountain manpower availability Mountain manpower availability

2008-Jul-21LBT Q Engineering Review Planning (Q3/2008) Failure analysis Failure analysis E-stop bypass to enable door closure E-stop bypass to enable door closure Rebuild pin for 1007 Rebuild pin for 1007 Shim socket for 0716 (the socket is ~100 mm too far away) Shim socket for 0716 (the socket is ~100 mm too far away)