What was found
(CAN) DURING ACFT FLIGHT TESTING, IT WAS REPORTED THAT THE RC GPS, EXPERIENCED SIMULTANEOUS LOSS OF SATELLITE SIGNAL PROCESSING IN BOTH GPS RECEIVERS WHEN FLYING AT 89.5 N AND 84.68 N LATITUDE. AIRCRAFT WITH RC GPS-4000S, PN 822-2189-005/010, UNITS INSTALLED COULD EXPERIENCE A SIMULTANEOUS DUAL GPS RECEIVER LOSS OF SATELLITE SIGNAL PROCESSING WHEN FLYING THROUGH SPECIFIC GEOGRAPHICAL AREAS, ABOVE 71 NORTH/SOUTH LATITUDE. TO DATE, THERE HAS BEEN NO REPORTED IN-SERVICE EVENT RELATED TO LOSS OF GPS SIGNAL PROCESSING. TRIAGE ASSESSMENT CURRENTLY IN-WORK.