What was found
TAXI BACK - GEG FLT 8777. DURING TAXI THE PILOT DISCOVERED THE NP INOP, READS ZERO AT ALL PROP SPEEDS. REMOVED NP CONNECTOR, CLEANED, DRIED AND REINSTALLED. AIRCRAFT RETURNED TO SERVICE.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
TAXI BACK - GEG FLT 8777. DURING TAXI THE PILOT DISCOVERED THE NP INOP, READS ZERO AT ALL PROP SPEEDS. REMOVED NP CONNECTOR, CLEANED, DRIED AND REINSTALLED. AIRCRAFT RETURNED TO SERVICE.