AD/B747/53 Amdt 4 - Longitudinal Skin Lap Joint and Body Frame Corrosion and Cracking Zoe has a public metadata record for this legal instrument, but accepted source text is not available in the agent mirror yet. Canonical page: https://zoelaw.ai/legislation/ad-b747-53-amdt-4-longitudinal-skin-lap-joint-and-body-frame-corrosion-and-cracking