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Abstract
Horizontal stabilizer berperan untuk menyeimbangkan lift yang terjadi pada sayap dengan memanfaatkan defleksi elevator. Untuk pesawat ATR 72, sistem elevator terbagi menjadi dua bagian, yaitu elevator kiri dan kanan. Pada keadaan normalnya, satu gerakan saja dari salah satu column control di cockpit mampu untuk menggerakan kedua elevator tersebut secara bersamaan karena keduanya saling terhubung. Namun dalam kondisi tertentu, antara sistem elevator kiri dengan yang kanan bisa terputus karena kegagalan sistem ataupun human eror sehingga menyebabkan aktifnya mekanisme pitch uncoupling. Dari kejadian tersebut, maka menimbulkan perbedaan gaya input antara elevator kiri dengan yang kanan, tentu hal ini berpengaruh langsung pada beban horizontal stabilizer yang sedang beroperasi. Untuk menentukan perbedaan beban yang diterima penulis membuat lima kasus perbedaan kondisi untuk mendapatkan perbedaan yang terjadi. Berdasarkan hasil yang diperoleh dari simulasi dengan menggunakan solidworks software didapatkan stress terbesar terdapat pada hinge kasus 23 degree deflection elevator yaitu sebesar 1,400e+008 N/m2, perbedaan stress terbesar pada saat normal 13 degree deflection elevator dengan 13 degree deflection pitch disconnect elevator sebesar 1.746e+007 N/m2, perbedaan stress terbesar pada saat normal 23 degree deflection elevator dengan 23 degree deflection pitch disconnect elevator sebesar 8,880e+007 N/m2, dan kasus pitch disconnect tidak mempengaruhi struktur horizontal stabilizer jika masih mengikuti prosedur (procedures following failures).
Horizontal stabilizer acts to balance the elevator that occurs on the wing by utilizing the elevator deflection. For the ATR 72 aircraft, the elevator system is divided into two parts, namely the left and right elevators. Normaly, one movement of the control columns in the cockpit is able to move both elevators simultaneously as they are connected together. But under certain conditions, between the left and the right elevator system can be disconnected due to system failure or human error causing the active mechanism of pitch uncoupling. From the incident, it causes the difference of input force between left and right elevator, of course it has direct effect on the horizontal load of the stabilizer being operated. To determine the difference in load received, the authors made five different case conditions to get the difference. Based on the results obtained from the simulation using solidworks software obtained the greatest stress found in hinge case 23 degree deflection elevator that is equal to 1,400e+008 N/m2, biggest difference of stress at normal 13 degree deflection elevator with 13 degree deflection pitch disconnect elevator 1,746e+007 N/m2, the largest difference in stress at normal 23 degree deflection elevators with 23 degree deflection pitch disconnect elevators of 8.880e+007 N/m2, and the pitch disconnect case did not affect the horizontal stabilizer structure if still following the procedures.
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References
- (1) ATSB Transport Safety Report. 2016, In-flight pitch disconnect involving ATR 72 aircraft, VH-FVR, Australian Transport Safety Bureau.
- (2) FAA, 2016, Pilot’s Handbook of Aeronautical Knowledge, Flight Standards Service, U.S. Department of Transportation, FFA-H-8083-25B.
- (3) ATR 72, 2012, Procedures Following Failures, Aircraft flight manual, Page:5A 600, EASA
- (4) Nita, M.F. 2008, Aircraft Design Studies Based on the ATR 72, Recent Research and Design Progress in Aeronautical Engineering and its Influence on Education, Brno University of Technology, Brno.
References
(1) ATSB Transport Safety Report. 2016, In-flight pitch disconnect involving ATR 72 aircraft, VH-FVR, Australian Transport Safety Bureau.
(2) FAA, 2016, Pilot’s Handbook of Aeronautical Knowledge, Flight Standards Service, U.S. Department of Transportation, FFA-H-8083-25B.
(3) ATR 72, 2012, Procedures Following Failures, Aircraft flight manual, Page:5A 600, EASA
(4) Nita, M.F. 2008, Aircraft Design Studies Based on the ATR 72, Recent Research and Design Progress in Aeronautical Engineering and its Influence on Education, Brno University of Technology, Brno.
