PPG Aerospace HSK421/425 Windshield Hump Seal Repair Kit

The PPG Aerospace Windshield Hump Seal Repair Kit contains everything needed to repair a hump seal on a windshield, including a new PR-1425CF chromate-free sealant. Because the sealant formulation, it cures in less than half the time of the previous sealants. Hump seal repairs can be completed overnight on the line or during a minor maintenance check in the hangar. Each kit includes polysulfide sealant, a moisture seal forming tool designed for the specific windshield, adhesion promoter, tape, razor blades, and gloves — all packed in an easy-to-carry box. Hump seal repair procedures are outlined in the applicable Aircraft Maintenance Manual (AMM) or PPG Abbreviated Component Maintenance Manual (ACMM). PPG recommends inspecting the windshield moisture seal every four months or every 1,000 flight hours, whichever occurs first, for signs of erosion, degradation, or cracking.