During the January 9, 2005 flight could not balance the EG&G instrument at altitude (-60 C) using the fine adjustment on the front of the instrument.

First time the EG&G instrument was balanced since we replace the mirrow and had the electronics fixed. The course adjustment was not set correctly.

Talked with Jeff Plugis at Edgetech. Jeff faxed me the procedure from the Manual on how to do a course balance of the EG&G. Basicly, it requires adjusting pot “B” inside the instrument at altitude and very cold temperature. Set the switch to the TEST position and turn the fine control adjustment to its most counter clockwise position. Adjust pot “B” until the meter reads 0.2. Then adjust the rest of the way using the fine adjustment on front of unit.

The course balance adjustment done on the January 25, 2005 flight at a altitude of 22,000 ft and temperature of -34 C and Dewpoint of -43 C.