The concern sheetOCR
This is OCR from the scanned FAA concern sheet. OCR can misread letters and numbers.
Airworthiness Concern Sheet FAA Date: May 11, 2006 Gary D. Park Make, Model, Series, Serial No.: Cessna Model Series 172, Aerospace Engineer R172, 175 Wichita Aircraft Certification Office Reason for Airworthiness Concern: The FAA is investigating ACE-118W an unsafe condition that has resulted in a Cessna 175 losing an 1801 Airport RD engine during landing.
Wichita, KS 67209 316-946-4123 Gary.Park@faa.gov FAA Description of Airworthiness Concern The Wichita ACO received a report of a Cessna Model 175 losing an engine, engine mount and firewall. A close examination of the failure showed that the 0513132-11 bracket had numerous cracks that finally released the upper engine mount attach bolt, producing the failure. A search of SDR's produced 57 reports of failures of 0513132-11 brackets. The brackets were used on Cessna model 172's, 175's and R172's. A disproportionate number of failures were on 175's, R172's and ST'd 172's, all with heavier engines than the 172's. The 0513132-11 bracket was used from the first 172's and 175's through the 1979 model year.
At this time, the FAA has not made a determination on what type of corrective action (if any) should be taken. The resolution of this airworthiness concern could involve an Airworthiness Directive (AD) action or a Special Airworthiness Information Bulletin (SAIB), or the FAA could determine that no action is needed at this time. The initial Risk Assessment for this concern indicated that an AD or SAIB might be considered.
Enclosed is the Initial Risk Assessment Evaluation Chart (IRAEC).
Comments The FAA requests your comments. Note: Any comments or replies to the FAA need to be as specific as possible. Please provide specific examples to illustrate your comments/concerns.
Attachments: *SDR(s)L _ *A/IDS_ | *SL(S)\ J *SAIBL | *FAASR/*NTSBSRL ] *AD *AMOC_ *RAL Notification: FAA *AOPA *EAA \ Type Club × *TC Holder Other:
Response Requested 6/4/06: Emergency (10 days) Alert (30 days) 1 Information (90 days) | (Space Bar Adds "X" to Check Boxes) *Service Difficulty Reports (SDRs); Accident/Incident Data System (A/IDS); Service Letter (SL); Special Airworthiness Information Bulletin (SAIB);
Federal Aviation Administration (FAA)/National Transportation Safety Board (NTSB) Safety Recommendation (FAASR/NTSBSR); Airworthiness Directive (AD); Alternate Method of Compliance (AMOC); Risk Assessment (RA); Aircraft Owners & Pilots Association (AOPA);
Experimental Aircraft Association (EAA); Type Certificate (TC)