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April 24, 1998

John McNamee
Mars Surveyor 98 Project Manager

The Pressure Modulator Infrared Radiometer (PMIRR) instrument failed to operate properly during orbiter solar thermal vacuum (STV) testing. A part failure in the 15V PMIRR power supply is the suspected cause. All other objectives of the orbiter thermal vacuum test were accomplished successfully. The plan is to break vacuum on Friday, April 24, troubleshoot the cause of the failure over the weekend, and reestablish vacuum conditions on Monday, April 27, if the team is confident the root cause of the failure has been diagnosed and fixed.

Lander integration and test activities are proceeding on schedule with no significant problems. ElectroMagnetic Interference/Compatibility (EMI/EMC) testing of the lander spacecraft was completed successfully.

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