From:
1:30 PM
Subject: NOAA-15, HIRS Filter Wheel Motor Current Anomaly, 1 February 2003 - Issued: 6 February 2003; 1830 UTC
Resent-From: nesdis.osdpd.ipd.Level-1B.notices@noaa.gov,
nesdis.osdpd.ipd.contractors@noaa.gov
Topic:
HIRS Filter Wheel Motor Current Increase
Date/Time(UTC) Message Issued:
6 February 2003; 1830 UTC
Satellite(s) Involved:
NOAA-15
Instrument(s) Involved:
HIRS
Product(s) Involved/Affected:
All
Date/Time(UTC) of Initial Implementation:
1 February 2003/1800 UTC
Details/Specifics of Change:
On February 1, the NOAA 15 HIRS experienced increased filter wheel motor
current, saturating channel 7 making it unusable. The Satellite Operations
Control Center turned on the filter wheel housing heater for 24 hours to
correct the anomaly and return channel 7 to normal. On February 3, the
Quality Control and Trending system was used to monitor the anomaly. It
revealed that when the heater was turned off, the channel 19 lunar intrusion
detection logic was triggered for all scan lines. On February 4, lunar
intrusion was switched off for 24 hours to allow the system to reset itself.
We expect the calibration problem to be corrected and Lunar Intrusion
corrections switched back on as of the following orbits:
NSS.HRPT.NK.D03037.S1930.E1943.B2461313.GC
NSS.GHRR.NK.D03037.S1602.E1758.B2461112.GC
.
Contact Person(s) Name/Email/Phone Number for Questions:
Emily.Harrod@noaa.gov/301-457-5247 ext. 117
Robert.Levin@noaa.gov/301-457-5247 ext. 117
Web site(s) that contain other relevant information (where applicable):
http://www.oso.noaa.gov/daily-news/index.htm - SOCC morning reports
http://www.osdpd.noaa.gov/PSB/PPP/PPP.html - History of level 1B
notices
http://www.ssd.noaa.gov/PS/SATS/messages.html - All user notices