4 TIPS Feb 21, 2008 Gyro Lifetime Estimates Chart below shows approximate gyro failure probabilities assuming a gyro failure in July 2007 (close to time of Gyro #2 failure) Jul-2007 May-2008 Jan-2009 Feb-2011 SM4 Predictions from Helen Wong (Aerospace Corp) as communicated to Art Whipple (HSTP)