Engineering Trend displays engineering data from the spacecraft 64 second TM. Since the data is obtained from the spacecraft telemetry, data is obtained even when the HRDI instrument is turned off. Data is continuous except for a few scattered days. The engineering data is 8 bits only and therefore can be rather jagged appearing.

Parameter	Years															Mission
Telescope zenith temperature	X 1991	X 1992	X 1993	X 1994	X 1995	X 1996	X 1997	X 1998	X 1999	X 2000	X 2001	X 2002	X 2003	X 2004	X 2005	X whole mission
Telescope azimuth temperature	X 1991	X 1992	X 1993	X 1994	X 1995	X 1996	X 1997	X 1998	X 1999	X 2000	X 2001	X 2002	X 2003	X 2004	X 2005	X whole mission
Telescope barrel temperature	X 1991	X 1992	X 1993	X 1994	X 1995	X 1996	X 1997	X 1998	X 1999	X 2000	X 2001	X 2002	X 2003	X 2004	X 2005	X whole mission
Interferometer electronics temperature	X 1991	X 1992	X 1993	X 1994	X 1995	X 1996	X 1997	X 1998	X 1999	X 2000	X 2001	X 2002	X 2003	X 2004	X 2005	X whole mission
Detector temperature	X 1991	X 1992	X 1993	X 1994	X 1995	X 1996	X 1997	X 1998	X 1999	X 2000	X 2001	X 2002	X 2003	X 2004	X 2005	X whole mission
Interferometer survival heater temperature	X 1991	X 1992	X 1993	X 1994	X 1995	X 1996	X 1997	X 1998	X 1999	X 2000	X 2001	X 2002	X 2003	X 2004	X 2005	X whole mission
Radiator temperature	X 1991	X 1992	X 1993	X 1994	X 1995	X 1996	X 1997	X 1998	X 1999	X 2000	X 2001	X 2002	X 2003	X 2004	X 2005	X whole mission
Processor temperature	X 1991	X 1992	X 1993	X 1994	X 1995	X 1996	X 1997	X 1998	X 1999	X 2000	X 2001	X 2002	X 2003	X 2004	X 2005	X whole mission
Support electronics temperature	X 1991	X 1992	X 1993	X 1994	X 1995	X 1996	X 1997	X 1998	X 1999	X 2000	X 2001	X 2002	X 2003	X 2004	X 2005	X whole mission
Support electronics quiet bus current	X 1991	X 1992	X 1993	X 1994	X 1995	X 1996	X 1997	X 1998	X 1999	X 2000	X 2001	X 2002	X 2003	X 2004	X 2005	X whole mission
Interferometer thermal control current	X 1991	X 1992	X 1993	X 1994	X 1995	X 1996	X 1997	X 1998	X 1999	X 2000	X 2001	X 2002	X 2003	X 2004	X 2005	X whole mission
Interferometer quiet bus current	X 1991	X 1992	X 1993	X 1994	X 1995	X 1996	X 1997	X 1998	X 1999	X 2000	X 2001	X 2002	X 2003	X 2004	X 2005	X whole mission
Telescope quiet bus current	X 1991	X 1992	X 1993	X 1994	X 1995	X 1996	X 1997	X 1998	X 1999	X 2000	X 2001	X 2002	X 2003	X 2004	X 2005	X whole mission
Spacecraft bus voltage [from interferometer current]	X 1991	X 1992	X 1993	X 1994	X 1995	X 1996	X 1997	X 1998	X 1999	X 2000	X 2001	X 2002	X 2003	X 2004	X 2005	X whole mission
Spacecraft bus voltage [from support electronic current]	X 1991	X 1992	X 1993	X 1994	X 1995	X 1996	X 1997	X 1998	X 1999	X 2000	X 2001	X 2002	X 2003	X 2004	X 2005	X whole mission
Telescope azimuth slew rate	X 1991	X 1992	X 1993	X 1994	X 1995	X 1996	X 1997	X 1998	X 1999	X 2000	X 2001	X 2002	X 2003	X 2004	X 2005	X whole mission
Filter wheel 1 position error rate	X 1991	X 1992	X 1993	X 1994	X 1995	X 1996	X 1997	X 1998	X 1999	X 2000	X 2001	X 2002	X 2003	X 2004	X 2005	X whole mission
Filter wheel 2 position error rate	X 1991	X 1992	X 1993	X 1994	X 1995	X 1996	X 1997	X 1998	X 1999	X 2000	X 2001	X 2002	X 2003	X 2004	X 2005	X whole mission
Duty cycle for radiator setting of -7.5 degrees C	X 1991	X 1992	X 1993	X 1994	X 1995	X 1996	X 1997	X 1998	X 1999	X 2000	X 2001	X 2002	X 2003	X 2004	X 2005	X whole mission
Duty cycle for radiator setting of -10.0 degrees C	X 1991	X 1992	X 1993	X 1994	X 1995	X 1996	X 1997	X 1998	X 1999	X 2000	X 2001	X 2002	X 2003	X 2004	X 2005	X whole mission
Duty cycle for raditor setting of -12.5 degrees C	X 1991	X 1992	X 1993	X 1994	X 1995	X 1996	X 1997	X 1998	X 1999	X 2000	X 2001	X 2002	X 2003	X 2004	X 2005	X whole mission
Telescope pulse bus current	X 1991	X 1992	X 1993	X 1994	X 1995	X 1996	X 1997	X 1998	X 1999	X 2000	X 2001	X 2002	X 2003	X 2004	X 2005	X whole mission
Telescope pulse bus current standard deviation	X 1991	X 1992	X 1993	X 1994	X 1995	X 1996	X 1997	X 1998	X 1999	X 2000	X 2001	X 2002	X 2003	X 2004	X 2005	X whole mission
Telescope pulse bus current fraction limits exceeded	X 1991	X 1992	X 1993	X 1994	X 1995	X 1996	X 1997	X 1998	X 1999	X 2000	X 2001	X 2002	X 2003	X 2004	X 2005	X whole mission
Support Electronics pulse bus current	X 1991	X 1992	X 1993	X 1994	X 1995	X 1996	X 1997	X 1998	X 1999	X 2000	X 2001	X 2002	X 2003	X 2004	X 2005	X whole mission
Support Electronics pulse bus current standard deviation	X 1991	X 1992	X 1993	X 1994	X 1995	X 1996	X 1997	X 1998	X 1999	X 2000	X 2001	X 2002	X 2003	X 2004	X 2005	X whole mission
Support Electronics pulse bus current fraction limits exceeded	X 1991	X 1992	X 1993	X 1994	X 1995	X 1996	X 1997	X 1998	X 1999	X 2000	X 2001	X 2002	X 2003	X 2004	X 2005	X whole mission
Bad subcom	X 1991	X 1992	X 1993	X 1994	X 1995	X 1996	X 1997	X 1998	X 1999	X 2000	X 2001	X 2002	X 2003	X 2004	X 2005	X whole mission
Fraction of time HRDI unpowered	X 1991	X 1992	X 1993	X 1994	X 1995	X 1996	X 1997	X 1998	X 1999	X 2000	X 2001	X 2002	X 2003	X 2004	X 2005	X whole mission
Fraction of UARS data collected	X 1991	X 1992	X 1993	X 1994	X 1995	X 1996	X 1997	X 1998	X 1999	X 2000	X 2001	X 2002	X 2003	X 2004	X 2005	X whole mission
Fraction of HRDI data collected	X 1991	X 1992	X 1993	X 1994	X 1995	X 1996	X 1997	X 1998	X 1999	X 2000	X 2001	X 2002	X 2003	X 2004	X 2005	X whole mission