AVIATION C I V I L E
Transcription
AVIATION C I V I L E
GROUPEMENT POUR LA SECURITE AVIATION C I V I L E BR 2004/21(A) DGAC BULLETIN DE RECOMMANDATION Edité par : DGAC FRANCE Le : 13 OCTOBRE 2004 TITRE : FIXATIONS ANTENNES DE RECEPTION SATCOM CP-2 DE CHEZ OUTERLINK CORPORATION MATERIELS CONCERNES : Hélicoptères BELL TEXTRON 206 et 407. DOCUMENT D'ORIGINE : FAA Special Airworthiness Information Bulletin SW-04-92 du 30 septembre 2004. RECOMMANDATION : Les propriétaires et utilisateurs d’hélicoptères BELL TEXTRON 206 et 407 sur lesquels des antennes de réception CP-2 Satcom de chez Outerlink Corporation sont montées, ainsi que les organismes d’entretien, sont invités à suivre les recommandations du document dont le texte est joint. 1/2 SPECIAL AIRWORTHINESS INFORMATION BULLETIN Aircraft Certification Service Washington, DC U.S. Department of Transportation Federal Aviation Administration No. SW-04-92 September 30, 2004 www.faa.gov/certification/aircraft This is information only. Recommendations are not mandatory. Introduction This Special Airworthiness Information Bulletin alerts you, owners and operators of certain Bell Helicopter Textron rotorcraft models (listed below) with Outerlink Corporation CP-2 Satcom System installed when the CP-2 receive antenna is installed in accordance with Outerlink Corporation drawing no. N000-1633, or similar design, of possible antenna mount failure. Bell Helicopter Textron 206A installed per STC SR00120BO 206B installed per STC SR00120BO 206L installed per STC SR00120BO 206L-1 installed per STC SR00120BO 206L-3 installed per STC SR00120BO 206L-4 installed per STC SR00120BO 407 installed per FAA Field Approval Background During a preflight inspection, the pilot of a Bell 206 discovered that the mounting bracket for the CP 2 Satcom receive antenna had separated from the helicopter due to vibration fatigue. The antenna mount is typically fabricated by the installing agency from 2024-T3 0.040" thick sheet aluminum. It is installed on the fin cap of the vertical fin using eight blind fasteners. The antenna coax was torn from the antenna upon separation of the antenna from the tail. Fortunately, the antenna mount didn’t make contact with the tail rotor. Approximately 3000 flight hours had accumulated on the helicopter since the CP-2 system was installed. Recommendations We highly recommend that you use a 10x magnifying glass and immediately inspect the CP-2 receive antenna mounting bracket for signs of fatigue cracking in the area along and directly above the rivet line where the bracket mounts to the vertical tail fin cap. You should repeat inspections every 25-50 flight hours or until the bracket is permanently removed from the rotorcraft. The STC holder is currently investigating other alternatives for mounting the CP-2 Satcom antenna. We will continue monitoring this safety issue and may take further action such as issuing an AD in the future. For Further Information Contact : Richard Spencer, Aerospace Engineer, ANE-150, Boston Aircraft Certification Office: phone: (781) 238-7184: email: [email protected] 2/2