What was found
HIGH FREQUENCY POPPING SOUND COMING FROM RT ENG ON TAXI OUT. FOUND RT I/B FLAP ROLLERS TRANSMITTING SOUND. REPLACED RT O/B ROTARY ACTUATOR AND PDU CNTRL VLV.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
HIGH FREQUENCY POPPING SOUND COMING FROM RT ENG ON TAXI OUT. FOUND RT I/B FLAP ROLLERS TRANSMITTING SOUND. REPLACED RT O/B ROTARY ACTUATOR AND PDU CNTRL VLV.