We are continuing the acceptance and development tests on the telescope begun in July, 2000. The work for our trip to Arizona scheduled for 24 June--1 July 2002 (by Joel Eaton and Mike Williamson) had to do with replacing the secondary mirror, assessing wear in the telescope mount from the first years' operations, running further tests on the oil return system, and perfecting the scheme for washing the primary mirror.

The work planned fell into three categories as follows:

1. MECHANICAL ADJUSTMENTS and augmentation of the telescope structure.
1. Remove the secondary mirror from the telescope, fit the new shim, fix the placement of the limit switches in the cell, put the new mirror into the telescope. Test the new mirror on stars. (We replaced the mirror on June 25 with a minimum of problems, and started testing it that night. The weather was rather poor, but we managed to get a 1.6-arcsec image on a 7th mag star with the cassegrain system without critically focusing the telesccope. Unfortunately, the telescope focused far enough from the home position of the secondary that the axial counterweight for the secondary had too much motion. To fix this problem, we took the cell apart on June 26, reset the zero-point sensors to the same height, and shimmed the secondary about 0.06 inches. This gave a more reasonable range for the counterweight.)
2. Adjust the dam for catching water used to wash the telescope mirror and put in the drain tube. Experiment with washing the mirror with mild detergent solution and drying with filtered air. (We adjusted the dam on June 27 but found it was too big to tighten completely around the mirror. This will require shimming at the top with further strips of rubber.)
3. Remove base skirt and inspect parts under it for wear or damage. (We did this on June 28, tightening the loose bolt to one of the shock absorbers. There wasn't much to fix under the skirt.)
4. Adjust tension on the drive tractors in light of experience with torques required for operations, (We adjusted them to the same tension used on the tilt tractor and tested them on the night of June 28.)
5. Run test using vacuum cleaner to give more vigorous sucking on the primary oil return system as a way of reducing the oil usage. (We constructed a reservoir in Nashville with connections for the oil return line, the vacuum cleaner, and the secondary oil pump. We assembled it at the observatory and ran a test on June 29. The vacuum suction seemed to clear out the oil more effectively than the gear pump alone, but it will require a filter on the suction line to keep oil out of the vacuum. We must now decide if we really need this extra level of complexity and whether we can find a vacuum reliable enough for continuous operations in an observatory.)
2. ELECTRICAL WIRING.
1. Begin rewiring the control box to bypass screw connections to the Galil controller and to position some devices so they are more accessible. (Deferred until the fall.)
3. Work on the DRIVES and CONTROL SYSTEM.
1. Decide how to get all three of the computers running the AST to reboot automatically after teh power comes back on after an interruption. (We resolved to replace the motherboards of these computers with ones allowing automatic reboots.)
2. Reconfigure the roof computer to put it into the AST network, and set up the routines for copying the weather information into the AST system. (We moved the roof-control computer into the local network on June 27, calling it t13r. We also reconfigured the processes for getting weather information to the AST and transferred this function off of the roof-control computer. The roof computer now controls the roof and monitors the UPS.)