47-10-07 LOCKHEED: (Was Mandatory Note 8 of AD-763-3.) Applies Only to Model 49 Serial Numbers 2021 to 2088, Inclusive.
Compliance required prior to April 1, 1947.
Replace the existing restrictor valve (P/N 66404) in each main landing gear down line with a winterized type restrictor valve (LAC P/N 667489.)
(LAC Service Instruction 049/SI-75, covers this same subject.)