47-10-09 LOCKHEED: (Was Mandatory Note 8 of AD-763-3.) Applies to All Model 49 Serials Up to and Including 2088.
Compliance required after each engine change.
When found necessary as a result of engine replacement in a quick-change powerplant unit, add seal plates to the engine oil lines where they pass through the engine fire seals, and add cover plates to the alternate oil line cutouts in the fire seals.
(LAC Service Instruction 49/51-39 and LAC Service Bulletin 49/SB-63 cover this same subject for Models 49-51 and 49-46, respectively.)