>Date: Sat, 16 Oct 1999 09:33:06 -0400
>Subject: FW: LIS Heater Status
>From: "Mark E. Fioravanti II" <mfiorava@pop400.gsfc.nasa.gov>
>To: Delisa Wilkerson <delisa.wilkerson@msfc.nasa.gov>,
>        Hugh Christian <Hugh.Christian@msfc.nasa.gov>,
>        Mike Stewart <Mike.Stewart@msfc.nasa.gov>,
>        Steve Goodman <Steve.Goodman@msfc.nasa.gov>
>CC: TRMM ENG <trmm_eng@listserv.gsfc.nasa.gov>, ahudick@erols.com
>Mime-version: 1.0
>X-Priority: 3
>Sender: owner-trmm_eng@listserv.gsfc.nasa.gov
>Precedence: bulk
>Reply-To: "Mark E. Fioravanti II" <mfiorava@pop400.gsfc.nasa.gov>
>
>Hello,
>
>    Below is a forwarded e-mail from Andy Calloway.  Attached is an Excel
>file with the times that the LIS heaters switched from primary to secondary,
>or turned both off.  Also included are the times that the lisconfig proc was
>executed.
>
>    Mark Fioravanti
>    TRMM FOT
>    (301) 286-0197
>
>----------
>From: Alexandra Calloway <ahudick@erols.com>
>To: mfiorava@pop400.gsfc.nasa.gov
>Subject: LIS Heater Status
>Date: Sat, Oct 16, 1999, 9:22 AM
>
>
>John and Steve:
>
>As you know, the latest command request we received from you authorized
>the console analysts to perform the LIS reset procedure upon detection
>of a heater switch condition, resulting from the Heater Controller
>actions.  The frequency of the heater switching has been increasing, and
>last night the analysts had to perform the procedure nearly every event.
>
>This morning (Saturday), during the 11:10 - 11:30z event, the analysts
>ran the procedure, restoring the heater configuration to primary, and
>within a minute the controller swapped heaters again.  This occurred
>twice during the event, and upon consulting with me, they restored the
>configuration one last time at the end of the event.
>
>Due to the greatly increased frequency of these occurrences, I had to
>make the decision to authorize the console analysts to disable the
>Heater Controller auto select function (12:42:32z).  John and I
>discussed the possibility on Friday of taking this action after
>gathering more data over the weekend.  Unfortunately, I felt this
>problem was now beginning to significantly impact the other realtime
>duties of the console analysts, and was therefore beginning to pose a
>safety risk.  The attention required to reset the LIS instrument
>repeatedly during every event would detract from the science collection
>operations and the health and safety monitoring of the rest of the
>spacecraft subsystems.
>
>Please contact myself and Candace Shoemaker on Monday morning, so we can
>discuss where we want to go from here.  If the Heater Controller is
>indeed malfunctioning, we have some other options such as the creation
>of Telemetry Monitors which could perform a similar function.  Thank you
>for your cooperation and assistance in this matter.
>
>Andy Calloway
>TRMM FOT Lead Systems Engineer
>
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