1. LBT Q2 2007 Engineering Review HBSC Hydrostatic Bearing System

2. 10-Jul-2007LBT Q2 2007 Engineering Review Highlights (Q2/2007) PLC now remotely controllable from MCSPU PLC now remotely controllable from MCSPU Start/Stop/Stow pins in–out/Alarm Reset/Remote Mode Enable WinCC (engineering diagnostic) running on dedicated workstation in Control Room WinCC (engineering diagnostic) running on dedicated workstation in Control Room 2 nd Modified Lateral pad installed last week 2 nd Modified Lateral pad installed last week

3. 10-Jul-2007LBT Q2 2007 Engineering Review

4. 10-Jul-2007LBT Q2 2007 Engineering Review Open Issues Technical Technical PLC Control law unknown, undocumented. PLC Control law unknown, undocumented. Firewall not penetrable for WinCC Firewall not penetrable for WinCC Schedule Schedule None None Financial Financial None None Resource Resource Mountain support pacing operation Mountain support pacing operation Luciano out of loop. Luciano out of loop. Network and Firewall communications issues unresolved Network and Firewall communications issues unresolved

5. 10-Jul-2007LBT Q2 2007 Engineering Review Progress (Q2/2007) Stow Pin remote control now possible Stow Pin remote control now possible WinCC (engineering diagnostic) running WinCC (engineering diagnostic) running Completed removal and replacement of 1 more modified lateral pad Completed removal and replacement of 1 more modified lateral pad Hardware and capillaries on hand for remaining installation Hardware and capillaries on hand for remaining installation

6. 10-Jul-2007LBT Q2 2007 Engineering Review Planning (Q3/2007) NRAO will modify 1 lateral pad across street NRAO will modify 1 lateral pad across street Remaining 6 will be modified at LBTO by NOAO in late Aug./early Sept. Remaining 6 will be modified at LBTO by NOAO in late Aug./early Sept. Continue capillary installation of laterals, followed by radials and azimuth Continue capillary installation of laterals, followed by radials and azimuth systematic measurement of lift, tuning system to maximize stiffness systematic measurement of lift, tuning system to maximize stiffness replace hoses with hard pipe on level 5 replace hoses with hard pipe on level 5

7. 10-Jul-2007LBT Q2 2007 Engineering Review PLC Programming Goals Remedy communication problem between LBTO WinCC computer and VoltsDC in Chandler. Remedy communication problem between LBTO WinCC computer and VoltsDC in Chandler. Complement WinCC Engineering override code to provide data-logging at ~10 Hz Complement WinCC Engineering override code to provide data-logging at ~10 Hz Rewrite PLC code to control pressure directly, not use lookup table. Rewrite PLC code to control pressure directly, not use lookup table. Identify and correct why PLC does not shutdown system when pocket pressures fail Identify and correct why PLC does not shutdown system when pocket pressures fail

8. 10-Jul-2007LBT Q2 2007 Engineering Review Hydraulic Goals Cut the oil flow, cooling and power to the bearings by more than half. Cut the oil flow, cooling and power to the bearings by more than half. Improve the static stiffness of the bearings by 10% Improve the static stiffness of the bearings by 10% Reduce system pressure from 120 to 95 bar. Reduce system pressure from 120 to 95 bar. Improve the dynamic stiffness of the Lateral bearing by about 500%. Improve the dynamic stiffness of the Lateral bearing by about 500%. Moving the capillaries to the pads and resize Moving the capillaries to the pads and resize Eliminate the internal ateral oil return groves. Eliminate the internal ateral oil return groves. Relocate the Lateral return hole. Relocate the Lateral return hole.