Recently the NOAA-17 AVHRR Scan Motor began having a timing
synchronization problem between the AVHRR and the MIRP. On February 12,
users started to report that they received images with a sudden
displacement, had data gaps, and experienced failures in processing
NOAA-17 direct readout data. The same problem was believed to be
observed on the previous AVHRR Scan Motors in the past. It is an
instrument aging issue.