TIP Side Swap on NOAA-15 - Data Loss, 24 April 2003 - Issued: 17 April 2003; 2015 UTC

4:19 PM
Subject: TIP Side Swap on NOAA-15 - Data Loss, 24 April 2003 - Issued: 17 April 2003; 2015 UTC

TIP side swap with 5 -10 minute data loss

Date/Time(UTC) Message Issued:
17 April 2003; 2015 UTC

Satellite(s) Involved:

Instrument(s) Involved:

Product(s) Involved/Affected:
All data users

Date/Time(UTC) of Initial Implementation:
24 April 2003 1743 UTC

Details/Specifics of Change:
On April 14, SOCC issued the following bulletin announcing the NOAA-15 TIP
side 1 to side 2 swap on April 24 during the 1743UTC pass.
"The analog telemetry on NOAA-15 is drifting upwards at a rate of one count
approximately every 150 days. The current value is beginning to generate
yellow limit violations and close in on the red limits. To rectify this
situation, the TIP is to be switched from side 1 to side 2. .... On April
24, 2003, we are planning to switch NOAA-15's TIP from side 1 to side 2. We
have scheduled a pass with no playbacks of recorded data so that we have
time available to ensure that the switch occurred nominally. However, since
the TIP switch will affect all telemetry and data, we will lose instrument
recordings for part of the contact. Most likely on the order of 5 - 10
minutes of data lost. The pass is scheduled for April 24th at 1743Z ...
Currently only one DTR (degital tape recorder) will be in active during that
contact. The data lost will be on GAC 2B. Additionally, the scheduled
playback of DTR 1A during rev. 25708 is postponed until rev. 25709. Thus,
the data from 1A will be delayed approximately 100 minutes."

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