In the current set of investigations foam sandwich panels and some components of an aircraft comprising of two layer GRPF face sheets with polyurethane foam as filler were examined for detection of debonds and defects by Fokker Bond and Acoustic Impact Technique (AIT) (woodpecker). Known defects were introduced in the panels in terms of Teflon inserts and foam removal in addition to edge delaminations by inserting a teflon film and removing it after curing. Two such panels were subjected to acoustic impact tests and analysis was carried out in both time and frequency domains. These panels were ultrasonically scanned to obtain C-SCAN images as reference to evaluate AIT results. Further Fokker Bond testing was carried out on the same panels as also some critical joints on the actual component. The results obtained from these tests are presented and discussed in this paper.