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9 Jan 81 HUD - pitch by Everline to Yardley on fact that HUD is poss. wt saving deletion item on Flt 5. Yardley [[Strike Out]] didn't buy [[/Strike Out]] left it on the delete list. Flt 5 ~Several 100# neg performance margin now. Wt performance status summary mtg. Bob says yardley seemed to link HUD w/SEATS RCS - Shelby Owen @ same mtg said RCS redesign optns to be reviewed ~April 12 Jan FiTTs- IMU's at Sit IMU 3 to be changed out-failing gyro drift All Lev's subject to Thermal stability problems 6 day warm-up reg'd - but impossible likely require in-flight GMEM cals E & D have long-duration test data to supply cals.