70-24-02\tBOEING: Amdt. 39-1112 as amended by Amendment 39-1203. The following airworthiness directive, applicable to all operators of Boeing 747 airplanes, was effective immediately upon receipt of telegram dated November 5, 1970. \n\tBecause of two cases of loss of main landings gear wheels during airplane takeoff, within the next 125 hours time in service after receipt of this telegram, unless already accomplished, determine the coding identification of the outboard bearing Timken Part No. LM 229139, in all landing gear wheels. Any bearing with code letter "A" through "F" must be replaced with a bearing with code letter "G" "or later" or with an equivalent bearing approved by the Chief, Aircraft Engineering Division, Western Region, before further flight. \n\tNOTE: The bearing identification code letter is between the words "Timken" and "made" on the back face of the bearing cone. \n\tAmendment 39-1112 became effective upon publication in the Federal Register for all persons except those to whom it was made effective immediately by telegram dated November 5, 1970. \n\tThis Amendment 39-1203 becomes effective May 7, 1971.