RAM SERVICE LETTER SL2003-01
COMPLIANCE WITH FAA AIRWORTHINESS DIRECTIVE
Provide clarification as to the applicability of AD 98-02-08 to RAM Aircraft owned Supplemental Type Certificates (STC) on Textron Lycoming O-320 series, four cylinder reciprocating engines.
Textron Lycoming O-320-E3D engines modified by STC SE8987SW and O-320-E2D engines modified by STC SE3692SW.
RAM Aircraft has FAA approval to increase the takeoff power rating of the Textron Lycoming O-320-E2D and O-320-E3D engines from 150 horsepower (HP) to 160 HP through STC SE3692SW and STC SE8987SW, respectively. The O-320-E2D engine modified by STC SE3692SW is installed on but not limited to Cessna model 172 aircraft. The O-320-E3D engine modified by STC SE8987SW is installed on but not limited to Piper model PA-28-140 and PA-28-151 aircraft.
FAA AD 98-02-08 (attached) was issued on Jan. 28, 1998 and applies to Textron Lycoming 320 series limited to 160 HP, and 360 series, four cylinder reciprocating engines with fixed pitch propellers. The action required by the AD is intended to prevent crankshaft failure, which can result in engine failure, propeller separation, forced landing, and possible damage to the aircraft. Note 1 of AD 98-02-08 states, “This airworthiness directive (AD) applies to each engine identified in the preceding applicability provision, regardless of whether it has been modified, altered, or repaired in the area subject to the requirements of this AD.” Since the engines modified by the STC(s) specified above are rated at 160 HP and have the same basic crankshaft as the standard 160 HP 320 series engines, then compliance with AD 98-02-08 is mandatory for these RAM modified engines.
Textron Lycoming O-320-E2D engines modified by STC SE3692SW and O-320-E3D engines modified by STC SE8987SW must comply with the requirements of AD 98-02-08 (attached).
Perform crankshaft inspections per Textron Lycoming Service Bulletin No. 505B, dated Dec. 1, 1997, within the compliance times specified by AD 98-02-08. Compliance with all portions of AD 98-02-08 is required.
As specified in AD 98-02-08, paragraph (f), if the crankshaft ID has been painted with Urethabond 104 and confirmed with the letters “PID” stamped on the propeller flange OD per Textron Lycoming Service Bulletin No. 530B, dated Nov. 22, 2004, then the inspection actions required by AD 98-02-08 are no longer necessary. However, it is necessary to complete the survey shown in Appendix 1 of AD 98-02-08.