Category: navion, continental, bearing
Applicability: Airplanes equipped with Continental model E185-3 engines having serial numbers 4289-D to 5110-D inclusive, and engines equipped at overhaul with tri-metal front main bearing inserts and bronze thrust washers in accordance with Continental bulletin no. M4 8-7.
Supersedes: n/a
Compliance: No later than the first major engine overhaul.
Procedure: Because of unsatisfactory service experience with Continental E185-3 engines equipped with No. 530497 tri-metal front main bearing inserts, and with No. 530494, 530495, 530544 thrust washers and 530545 dowel pins, these parts must be replaced with the original silver main thrust bearing inserts, Continental No. 40644.
Notes: Continental Service Bulletin M48-30 covers this same subject and Ryan Navion Field Service Bulletin No. 5 outlines the interim precautions to be taken on airplanes equipped with the unsatisfactory thrust washers until silver main thrust bearings are installed in accordance with this note.
AD-49-05-03