What was found
DURING FLIGHT 2985, RUDDER LIMITER LIGHT ILLUMINATED ALONG WITH ERRONEOUS READINGS FROM STANDBY AND F/O'S AIRSPEED INDICATORS. FLT CREW DECLARED EMERGENCY INTO MSP. HEAVY ICING CONDITIONS ENCOUNTERED THROUGHOUT FLIGHT. CXLD DUE TO WEATHER. MAINTENANCE DRAINED AND PURGED NR 2 AND STBY PITOT SYSTEM WITH NITROGEN, NR 2 AND STBY PITOT SYSTEMS TEST GOOD IAW SF-340 MM CHAPTER 34, RUDDER LIMITER LIGHT ILLUMINATED BECAUSE OF STBY A/S SPLIT BETWEEN NR 1, RUDDER LIMITER TESTS GOOD.