FOR INSTRUCTION ONLY - The disclosure is prohibited. Owner: bagaselangpujanugraha@ahmalaysia.emanuals-airbushelicopters.com 12 - Stabilizers (ATA 55) AS350B3 2D T1 Training Manual 12 - Stabilizers (ATA 55) All rights reserved. Reproduction or translation in whole or in part of the contents of this publication without permission of Airbus Helicopters is not authorized. 12 - 1 For instruction only © AIRBUS - All rights reserved - 2021 FOR INSTRUCTION ONLY - The disclosure is prohibited. Owner: bagaselangpujanugraha@ahmalaysia.emanuals-airbushelicopters.com 12 - Stabilizers (ATA 55) AS350B3 2D T1 Training Manual List of effective pages Page 2 -- Rev. 10-2021 Page 3 -- Ed. 10-2021 Page 4 -- Rev. 08 - 2017 Page 5 -- Rev. 08 - 2017 Page 6 -- Rev. 08 - 2017 Page 7 -- Rev. 09-2021 Page 8 -- Rev. 08 - 2017 Page 9 -- Rev. 08 - 2017 Page 10 -- Iss. 06 - 2016 Page 11 -- Iss. 06 - 2016 Page 12 -- Rev. 09 - 2017 Page 13 -- Rev. 09 - 2017 Page 14 -- Iss. 06 - 2016 Page 15 -- Iss. 06 - 2016 Page 16 -- Rev. 10-2021 Page 17 -- Rev. 10-2021 For instruction only Rev. 10-2021 © AIRBUS - All rights reserved - 2021 12 - 2 FOR INSTRUCTION ONLY - The disclosure is prohibited. Owner: bagaselangpujanugraha@ahmalaysia.emanuals-airbushelicopters.com 12 - Stabilizers (ATA 55) AS350B3 2D T1 Training Manual Table of content 1. Presentation ...................................................................... 4 2. Tail unit .............................................................................. 6 3. Horizontal stabilizer description...................................... 8 4. Horizontal stabilizer functioning ................................... 12 5. Vertical fins description ................................................. 14 6. Vertical fins functioning ................................................. 16 For instruction only Iss. 10-2021 © AIRBUS - All rights reserved - 2021 12 - 3 FOR INSTRUCTION ONLY - The disclosure is prohibited. Owner: bagaselangpujanugraha@ahmalaysia.emanuals-airbushelicopters.com 12 - Stabilizers (ATA 55) 1. Presentation AS350B3 2D T1 Training Manual 1. Presentation The purpose of this chapter is to make a presentation of the different helicopter parts used to improve the aero-dynamical stability in flight. These parts are: • The tail unit, • The horizontal stabilizers, • The vertical fin. For instruction only Rev. 08 - 2017 an_00_m_m_00_l0_a550000_01_en_001 © AIRBUS - All rights reserved - 2021 12 - 4 FOR INSTRUCTION ONLY - The disclosure is prohibited. Owner: bagaselangpujanugraha@ahmalaysia.emanuals-airbushelicopters.com 12 - Stabilizers (ATA 55) 1. Presentation For instruction only Rev. 08 - 2017 an_00_m_m_00_l0_a550000_01_en_001 © AIRBUS - All rights reserved - 2021 AS350B3 2D T1 Training Manual 12 - 5 FOR INSTRUCTION ONLY - The disclosure is prohibited. Owner: bagaselangpujanugraha@ahmalaysia.emanuals-airbushelicopters.com 12 - Stabilizers (ATA 55) 2. Tail unit AS350B3 2D T1 Training Manual 2. Tail unit The tail unit consist of : • A horizontal stabilizer, • A (dorsal) upper fin, • A (ventral) lower fin equipped with a tail guard, dedicated to protect the tail blade. These vertical and horizontal airfoil sections act as stabilizers. When subject to relative wind, they tend to: • Counteract any changes in the helicopter’s attitude, • Bring the helicopter back to its original attitude after any deviations. For instruction only Rev. 08 - 2017 an_00_m_m_00_l1_a550000_01_en_001 © AIRBUS - All rights reserved - 2021 12 - 6 FOR INSTRUCTION ONLY - The disclosure is prohibited. Owner: bagaselangpujanugraha@ahmalaysia.emanuals-airbushelicopters.com 12 - Stabilizers (ATA 55) 2. Tail unit For instruction only Rev. 09-2021 an_00_m_m_00_l1_a550000_01_en_001 © AIRBUS - All rights reserved - 2021 AS350B3 2D T1 Training Manual 12 - 7 FOR INSTRUCTION ONLY - The disclosure is prohibited. Owner: bagaselangpujanugraha@ahmalaysia.emanuals-airbushelicopters.com 12 - Stabilizers (ATA 55) 3. Horizontal stabilizer description AS350B3 2D T1 Training Manual 3. Horizontal stabilizer description Installed in front of the tail rotor, through the tail boom, the horizontal stabilizer is made in one light alloy aluminium piece, sheets with various ribs and a spar. Note: The horizontal stabilizer provides attachment for the position lights, at its left and right ends. For instruction only Rev. 08 - 2017 an_00_t_m_03_l1_a551000_01_en_001 © AIRBUS - All rights reserved - 2021 12 - 8 FOR INSTRUCTION ONLY - The disclosure is prohibited. Owner: bagaselangpujanugraha@ahmalaysia.emanuals-airbushelicopters.com 12 - Stabilizers (ATA 55) 3. Horizontal stabilizer description For instruction only Rev. 08 - 2017 an_00_t_m_03_l1_a551000_01_en_001 © AIRBUS - All rights reserved - 2021 AS350B3 2D T1 Training Manual 12 - 9 FOR INSTRUCTION ONLY - The disclosure is prohibited. Owner: bagaselangpujanugraha@ahmalaysia.emanuals-airbushelicopters.com 12 - Stabilizers (ATA 55) 3. Horizontal stabilizer description AS350B3 2D T1 Training Manual Pictures of the horizontal stabilizer. For instruction only Iss. 06 - 2016 an_00_t_m_03_l1_a551000_01_en_001 © AIRBUS - All rights reserved - 2021 12 - 10 FOR INSTRUCTION ONLY - The disclosure is prohibited. Owner: bagaselangpujanugraha@ahmalaysia.emanuals-airbushelicopters.com 12 - Stabilizers (ATA 55) 3. Horizontal stabilizer description For instruction only Iss. 06 - 2016 an_00_t_m_03_l1_a551000_01_en_001 © AIRBUS - All rights reserved - 2021 AS350B3 2D T1 Training Manual 12 - 11 FOR INSTRUCTION ONLY - The disclosure is prohibited. Owner: bagaselangpujanugraha@ahmalaysia.emanuals-airbushelicopters.com 12 - Stabilizers (ATA 55) 4. Horizontal stabilizer functioning AS350B3 2D T1 Training Manual 4. Horizontal stabilizer functioning The horizontal stabilizer has an asymmetric NACA airfoil, set at a negative angle ( - 2° ± 30’ ) to the horizontal datum. In flight, when the horizontal stabilizer is subject to a relative wind, V, this airfoil generates an aerodynamic force, F, which tends to right the helicopter, and keeps it stable on its pitch axis. For instruction only Rev. 09 - 2017 an_00_m_m_04_l2_a552006_01_en_001 © AIRBUS - All rights reserved - 2021 12 - 12 FOR INSTRUCTION ONLY - The disclosure is prohibited. Owner: bagaselangpujanugraha@ahmalaysia.emanuals-airbushelicopters.com 12 - Stabilizers (ATA 55) 4. Horizontal stabilizer functioning For instruction only Rev. 09 - 2017 an_00_m_m_04_l2_a552006_01_en_001 © AIRBUS - All rights reserved - 2021 AS350B3 2D T1 Training Manual 12 - 13 FOR INSTRUCTION ONLY - The disclosure is prohibited. Owner: bagaselangpujanugraha@ahmalaysia.emanuals-airbushelicopters.com 12 - Stabilizers (ATA 55) 5. Vertical fins description AS350B3 2D T1 Training Manual 5. Vertical fins description The vertical stabilizer, composed of two vertical fins, is located at the tail end of the aircraft. The fin attachment consists of fittings and spars, bolted on the tail boom end. The fittings are bolted on top and below the tail boom end with peel washers to compensate the gap between the tail boom and the fittings of the fins. A wear plate is riveted on the end of the tail boom on the upper surface. The spars are bolted together on the last tail boom frame. For instruction only Iss. 06 - 2016 an_00_m_m_06_l0_a550000_01_en_001 © AIRBUS - All rights reserved - 2021 12 - 14 FOR INSTRUCTION ONLY - The disclosure is prohibited. Owner: bagaselangpujanugraha@ahmalaysia.emanuals-airbushelicopters.com 12 - Stabilizers (ATA 55) 5. Vertical fins description For instruction only Iss. 06 - 2016 an_00_m_m_06_l0_a550000_01_en_001 © AIRBUS - All rights reserved - 2021 AS350B3 2D T1 Training Manual 12 - 15 FOR INSTRUCTION ONLY - The disclosure is prohibited. Owner: bagaselangpujanugraha@ahmalaysia.emanuals-airbushelicopters.com 12 - Stabilizers (ATA 55) 6. Vertical fins functioning AS350B3 2D T1 Training Manual 6. Vertical fins functioning Tail unit Special feature of upper fin: In cruise flight, the asymmetric NACA airfoil of the upper-fin generates an aerodynamic force F1, which opposes to the main rotor's counter torque Cr, and thus reinforces the tail rotor thrust. This allows the tail rotor pitch to be reduced and thus save power. Special feature of lower fin: The symmetric NACA airfoil of the lower fin maintains the helicopter on its yaw axis in cruise flight. For instruction only Rev. 10-2021 an_00_m_m_04_l2_a552007_01_en_001 © AIRBUS - All rights reserved - 2021 12 - 16 FOR INSTRUCTION ONLY - The disclosure is prohibited. Owner: bagaselangpujanugraha@ahmalaysia.emanuals-airbushelicopters.com 12 - Stabilizers (ATA 55) 6. Vertical fins functioning For instruction only Rev. 10-2021 an_00_m_m_04_l2_a552007_01_en_001 © AIRBUS - All rights reserved - 2021 AS350B3 2D T1 Training Manual 12 - 17 FOR INSTRUCTION ONLY - The disclosure is prohibited. Owner: bagaselangpujanugraha@ahmalaysia.emanuals-airbushelicopters.com 12 - Stabilizers (ATA 55) AS350B3 2D T1 Training Manual End of chapter 12 - 18 For instruction only © AIRBUS - All rights reserved - 2021
