There is phenolic bushing, P/N FGFB715001004A2, IPC 49-81-10-10 item 300, in the top mount of the APU exhaust (see Figure 1) that is commonly broken or missing (see Figures 2 &3) and overlooked during inspection. Catching and replacing this early prevents damage to both the bracket and the exhaust stack mount.
Aircraft Sales: Addressing Component Discrepancies During A Pre-Purchase Evaluation
Troubleshooting Classic Learjet Spoileron Systems
Incentives & Solutions Available As Gogo Phases Out Legacy ATG Network Technology
Five Steps To Extend The Life Of Your Aircraft's Batteries
Preventing Downtime: Tracking Aircraft Wheel Inspections & OEM Limits