Service Instruction No. 1533 D

Approved Rotary Vane Fuel Pumps

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Supersedes Service Instruction No. 1533 C

January 11, 2019


All Lycoming reciprocating aircraft engines using rotary style fuel pumps


As Required for Replacement


Changed SUBJECT line, new fuel pump part number was added

This Service Instruction is to inform owners and operators of a change to the part numbers for fuel pumps. The succeeding part numbers have been manufactured to be equivalent to the previous part numbers and are interchangeable with the previous part numbers. Table 1 identifies the previous fuel pump part numbers for both Lycoming and the supplier and the successive Lycoming part number and supplier part number.

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