Service Bulletin No. 671
Fuel Pump Leak Inspection and Diaphragm Replacement, Hartzell Engine Tech (HET) Alert Service Bulletin No.233
Publications
DATE:
August 24, 2026
SUBJECT:
Fuel Pump Leak Inspection and Diaphragm Replacement, Hartzell Engine Tech (HET) Alert Service Bulletin No.233
MODELS AFFECTED:
All Lycoming engines using AN style fuel pumps manufactured by HET with P/N 063F-0001 diaphragms with a cure date of 02/25 through 02/26
TIME OF COMPLIANCE:
Before next flight