1. LBT Q4 2008 Eng/SW Review SHTRShutters/Seals/Mechanisms

2. 2009-Jan-13LBT Q4 2008 Engineering Review Highlights (Q4/2008) There were a few issues with the right door ultimately traced to Issue 1821: On windy nights, the right shutter door faults due to it bouncing off the seal when it closes. There were a few issues with the right door ultimately traced to Issue 1821: On windy nights, the right shutter door faults due to it bouncing off the seal when it closes. Latch 0716 Disabled Latch 0716 Disabled Latch 1007 failed in January Latch 1007 failed in January

3. 2009-Jan-13LBT Q4 2008 Engineering Review Progress (Q4/2008) Planning From Q3 Review: Planning From Q3 Review: Failure analysis Failure analysis Test new sliding latch Test new sliding latch

4. 2009-Jan-13LBT Q4 2008 Engineering Review Open Issues Technical Technical Failure Analysis Failure Analysis 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 Logic failure – pins extend before door closes Logic failure – pins extend before door closes 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

5. 2009-Jan-13LBT Q4 2008 Engineering Review Planning (Q1/2009) Failure analysis Failure analysis Test new sliding latch Test new sliding latch