Service Instruction No. 1545
Expanded Clearance in Crankcase Nose
DATE: October 2, 2012
320/360 series Lycoming engines with crankcase casting part number C11B20061R Revision M or later and C11B20061L Revision M or later.
TIME OF COMPLIANCE
Lycoming fourcylinder 320 and 360 series engine models can have a tight fit at the nose area (Figure 1) in some airframes. There is not enough clearance between the engine and adjacent airframe components such as airframe supplied alternator or air conditioning mounting brackets. This Service Instruction includes a procedure to remove crankcase material through burring from the crankcase rib for increased clearance in the nose for these engines in the impacted airframe applications.
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