A C150 FLOWN AFTER ANNUAL INSPECTION EXHIBITED A ROUGH RUNNING ENG. DIVERTED. CRACK FOUND IN SPINNER BULKHEAD. PROP AND SPINNER INSPECTION NOT COMPLETED DURING ANNUAL INSPECTION.

Narrative

ANNUAL INSPECTION WAS PERFORMED ON C150 SERIAL NUMBER X; ACFT X. DURING THE INSPECTION; THE PROP SPINNER WAS NOT REMOVED AND THE SECURITY OF THE SPINNER RETAINING BULKHEAD MISSED. THE PROP WAS INSPECTED AND DRESSED FOR NICKS AND MINOR SCRATCHES ACCORDINGLY. A GENERIC CHKLIST WAS USED FOR THE INSPECTION PER FAR PART 43 APPENDIX D. SINCE THE PROP WAS DRESSED FOR NICKS; IT WAS ASSUMED THAT THE PROP WAS INSPECTED. THIS HAPPENED DURING SHIFT CHANGE AND NEXT DAY WAS NOT FOLLOWED THROUGH. THE CHKMARK WAS COMPLETED PER CHKLIST FOR THE DRESSING OF THE PROP. HUMAN FACTORS INVOLVED; LATE DAY RUSH; STRESS FROM PERSONAL PROBS AT HOME. TO PREVENT FURTHER PROBS; NEW TYPE CHKLIST ADOPTED; DETAILING TASKS OF FURTHER PROP INSPECTIONS. OTHER FACTORS INVOLVED WERE: UNQUALIFIED OWNER OPERATOR DOING OWN UNAPPROVED MAINT ON THIS ACFT. VARIOUS BUYERS PERFORMING PRE-BUY INSPECTIONS ON THIS ACFT AND REMOVING PANELS UNAUTH AFTER ANNUAL INSPECTION WAS COMPLETE. AT THE TIME OF THE INCIDENT; THE ENG DEVELOPED ROUGH RUNNING CONDITIONS AND LANDED AT THE NEAREST ARPT WITH NO EVENT. INSPECTION REVEALED A LOOSE SPINNER. SPINNER AND BULKHEAD WAS REPLACED; PROP NICK DRESSED AND RETURNED AIRWORTHY. FURTHER CONCLUSIONS: ACFT AGING AND CLOSER INSPECTIONS ADOPTED. REVISED PAPER. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE PROP HAD BEEN DRESSED FOR NICKS AND IT WAS ASSUMED THE SPINNER AND SPINNER BULKHEAD INSPECTION HAD BEEN ACCOMPLISHED. THE RPTR SAID WHILE A GENERIC CHKLIST WAS USED THE SPINNER AND SPINNER BULKHEAD WERE NOT INSPECTED AND WERE RELEASED FOR SVC. THE RPTR SAID THE AIRPLANE WAS FLOWN AND DIVERTED TO THE NEAREST ARPT FOR ROUGH ENG OP. THE RPTR STATED REVISED PAPERWORK AND INSPECTION PROCS ARE NOW IN PLACE TO PREVENT MISSED INSPECTIONS. THE RPTR SAID THE FAA HAS NOT BEEN INVOLVED WITH THIS INCIDENT.