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May 15, 1998

John McNamee
Mars Surveyor 98 Project Manager

Orbiter integration and test activities are proceeding on schedule. Mission system testing of the mapping phase is in progress. The Mars Color Imager (MARCI) flight instrument has been removed from the orbiter to allow upgrading of the color filter array. Troubleshooting of the various Pressure Modulator InfraRed Radiometer (PMIRR) anomalies continues. The PMIRR chopper motor is scheduled for removal from the instrument on May 19 for troubleshooting at the vendor (Honeywell).

Lander integration and test activities are proceeding on schedule. The lander was moved into the thermal vacuum chamber on May 11 and chamber pump down for cruise configuration thermal vacuum testing will begin on May 16.

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