1. LBT Q1 2007 Engineering Review MCSC Mount Control System

2. 19-Apr-2007LBT Q1 2007 Engineering Review Highlights (Q1/2007) No planned work during Q1/2007 No planned work during Q1/2007 ELFR motor brushes failed March 15, damaging the motor windings. The motor is now operational but winding damage may impact its lifespan. ELFR motor brushes failed March 15, damaging the motor windings. The motor is now operational but winding damage may impact its lifespan.

3. 19-Apr-2007LBT Q1 2007 Engineering Review Open Issues Technical Technical Azimuth main encoder Azimuth main encoder Installation of remaining elevation main encoder read heads Installation of remaining elevation main encoder read heads Motor encoder jumps Motor encoder jumps Occasional unexplained elevation tracking errors Occasional unexplained elevation tracking errors ELFR motor winding damage ELFR motor winding damage All brushes must be inspected and replaced if necessary All brushes must be inspected and replaced if necessary Schedule Schedule None None Financial Financial None None Resource Resource MCS competing for resources against rotator development effort MCS competing for resources against rotator development effort Unable to access elevation motors due to safety concerns Unable to access elevation motors due to safety concerns

4. 19-Apr-2007LBT Q1 2007 Engineering Review Progress (Q1/2007) Unexplained elevation tracking errors now appear to be linked to the HBS runout Unexplained elevation tracking errors now appear to be linked to the HBS runout Encoder jumps have apparently subsided since ELFR motor brush replacement Encoder jumps have apparently subsided since ELFR motor brush replacement

5. 19-Apr-2007LBT Q1 2007 Engineering Review Planning (Q2/2007) April 25 : April 25 : Azimuth main encoder review Azimuth main encoder review May 14 : May 14 : Farrand Controls visits Farrand Controls visits May 22 : May 22 : Elevation encoder heads installed Elevation encoder heads installed May 21-24 : May 21-24 : Elevation and azimuth motor encoder tests Elevation and azimuth motor encoder tests Azimuth and elevation servo maintenance Azimuth and elevation servo maintenance TBD: TBD: Elevation motor brush inspection and replacement Elevation motor brush inspection and replacement TBD: TBD: Azimuth main encoder rework Azimuth main encoder rework