50-06-02 BOEING: Applies to All Model 75 Series Aircraft.
Compliance required at each annual inspection. For military aircraft, compliance also required prior to original certification.
Remove the center section gas tank and inspect both front and rear spars for cracks, checks and warping. Defective spars should be replaced or repaired in accordance with CAM 18. Ascertain that all drain holes are open.
Repeated removal of the tank at each annual inspection is not necessary, if after accomplishment of the items mentioned above, the gap between the gas tank and the upper surface of the center section is sealed by doping on grade A fabric tape, or equivalent sealing means, to prevent moisture entering the tank compartment.
This supersedes AD 45-51-01.