The concern sheetOCR
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Airworthiness FAA Concern Sheet Date: November 19, 2007 James P. Galstad Make, Model, Series, Serial No.: Cessna Aircraft Company Propulsion Aerospace Engineer Model 525, Serial No: 525-0600 through 525-0636 ACE-116W Propulsion 1801 Airport Road, Room 100 Reason for Airworthiness Concern: A gap exists in the firewall Wichita, KS 67203 that is not sealed with firewall sealant. A nacelle fire may pass 316-946-4135 through the gap resulting in an uncontrolled fire.
james.galstad@faa.gov FAA Description of Airworthiness Concern (Who, What, Where, When, How? Attachments: RA and appropriate data) The Cessna Model 525 serial numbers listed above may have been manufactured without firewall sealant that seals a particular gap in the firewall. Since a nacelle fire may pass through the unsealed gap, the nacelle fire is considered to be uncontrolled. An Initial Risk Assessment is attached. Cessna plans for a Service Letter to inspect for missing firewall sealant and apply firewall sealant as needed.
Request for Information (Proposed Alternate Inspection/Repair Procedures, Cost Impact, Etc. Note: Any comments or replies to the FAA need to be as specific as possible. Please provide specific examples to illustrate your comments/concerns.):
Review and comments are requested by November 16, 2007. Cessna SL525-71-05 provides for an inspection of this area to be performed and firewall sealant installed per the type design drawings, if sealant is not installed.
This Airworthiness Concern Sheet (ACS) is intended as a means for FAA Aviation Safety Engineers to coordinate airworthiness concerns with aircraft owner/operators through associations and type clubs. 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 AD action or an SAIB. or the FAA could determine that no action is needed at this time. The FAA's final determination will depend in part on the information received in response to this ACS.
The FAA endorses dissemination of this technical information to all manufacturers and requests association and type clubs comments.
Attachments: *SDR(s) *A/IDS_ | *SL(s) *SAIB| *FAASR/*NTSBSR *AD *AMOC_ *RAX Notification: FAA X *AOPA ‹ *EAA Type Club *TC Holder X Other: NBAA, GAMA Response Requested 11/16/07: Emergency (10 days) Alert (30 days) Information (90 days) (Space Bar Adds "X" to Check Boxes) *Service Difficulty Reports (SDRS); Accident/Incident Data System (A/DS); 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) Revised 1/24/02