What was found
AIR TURN BACK, INFLIGHT SHUTDOWN CSD LOW OIL CAME ON AT LEVEL OFF. RETURNED TO BWI NR 1ENGINE. R & R NR 1 CSD, CSD OIL COOLER & CASE DRAIN FILTER IAW MM.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
AIR TURN BACK, INFLIGHT SHUTDOWN CSD LOW OIL CAME ON AT LEVEL OFF. RETURNED TO BWI NR 1ENGINE. R & R NR 1 CSD, CSD OIL COOLER & CASE DRAIN FILTER IAW MM.