The concern sheetOCR
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Airworthiness FAA Concern Sheet Date: 8 March 2007 Full Name Philip Petty Title Aerospace Engineer (electrical) Organization FAA Department ACE-119W Address 1801 Airport Rd, Room 100 City State ZIP Wichita, KS 67209 Telephone Number 316-946-4139 E-mail philip.petty@faa.gov Make, Model, Series, Serial No.:
Raytheon Model 390 Premier 1, Serials RB-1, RB-4 through RB-149 Reason for Airworthiness Concern: The FAA has received a report of significantly premature generator failure due to a manufacturing error. There is an increased concern of a dual generator failure on a single flight.
FAA Description of Airworthiness Concern (Who, What, Where, When, How? Attachments: RA and appropriate data):
There is a concern that there could be significantly premature generator failure. It is believed this is caused by a manufacturing error in the assembly of the generator.
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.): We are currently evaluating what corrective action would be appropriate. The airplane manufacturer has released a mandatory service bulletin (SB24- 3790, August 2006). SB 24-3790 instructs operators to perform a one-time inspection of the generators to determine if they are defective ones or not (by part number). If the part number indicates they are defective, they are to remove the generator and replace it with an improved version. The airplane manufacturer has requested this be enforced with an Airworthiness Directive which mandates the service bulletin. If AD action were to be taken, there would likely by a difference in the compliance time between that in the service bulletin and the AD. The compliance time would likely be 200 hours following effective date of AD rather than 200 hours following receipt of service bulletin as stated in service bulletin.
Please direct all comments/input to Philip Petty at the Wichita Aircraft Certification Office no later than March 22, 2007. (Contact information above) 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)L | *A/IDS | *SL(s)| ] *SAIB[| *FAASR/*NTSBSR[| *AD[| *AMOC[ | *RA| Notification: HAA *AOPA *EAA Type Club *TC Holder Other:
Response Requested//: Emergency (10 days) Alert (30 days) Information (90 days) L (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/NTSBS); 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