ATA 55 Stabilizers PDF January 2023

BOMBARDIER DHC 8-400 (PWC PW150) ATA 55 - STABILISERS TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY B1/B2 MAINTENANCE TRAINING MANUAL Issue 6 - January 2023 Page 1 of 22 BOMBARDIER DHC 8-400 (PWC PW150) STABILIZERS Pneumatic de-icing boots are attached to the stabilizer leading edges. GEN...

BOMBARDIER DHC 8-400 (PWC PW150) ATA 55 - STABILISERS TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY B1/B2 MAINTENANCE TRAINING MANUAL Issue 6 - January 2023 Page 1 of 22 BOMBARDIER DHC 8-400 (PWC PW150) STABILIZERS Pneumatic de-icing boots are attached to the stabilizer leading edges. GENERAL DESCRIPTION The stabilizers give stable attitude around the lateral (pitch) and vertical (yaw) axis of the aircraft. There are two stabilizers: • • Vertical Horizontal The vertical stabilizer is constructed as part of the aft/tail fuselage. The horizontal stabilizer is attached to the top of the vertical stabilizer. The joint between the vertical and horizontal stabilizer is covered by a removable, four piece composite aerodynamic fin fairing. The fore rudder is attached to fittings on the aft edge of the vertical stabilizer. The elevators attach to fittings on the rear spar of the horizontal stabilizer. Stabilizer components are made from high strength aluminium alloy. The stabilizer has these sub-systems: • • • • Horizontal Stabilizer Elevator Vertical Stabilizer Rudder The vertical and horizontal stabilizers are made of high-strength aluminium alloy. The structures use conventional spar and rib construction. The skins are stiffened with bonded stringers. The leading edges are constructed of composite material. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 55 - STABILISERS Issue 6 - January 2023 Page 2 of 22 BOMBARDIER DHC 8-400 (PWC PW150) STABILIZERS GENERAL DESCRIPTION HORIZONTAL STABILIZER The horizontal stabilizer is an airfoil that stabilizes movement of the aircraft around the lateral pitch axis. The left and the right elevators are moveable surfaces that control the movement of the aircraft around the lateral axis. The fixed incidence horizontal stabilizer has a front, mid and rear spar connected by profile ribs and covered with skin panels stiffened by riveted stringers. Each of the three spars has two fittings for attachment of the horizontal stabilizer at the upper end of the vertical stabilizer. Hinge arms for the elevators are attached to the rear spar and adjacent ribs. Leading edges are of a composite construction in two sections per side. They are installed with locators to prevent incorrect installation, and have pneumatic de-icer boots installed. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 55 - STABILISERS Issue 6 - January 2023 Page 3 of 22 BOMBARDIER DHC 8-400 (PWC PW150) STABILIZERS GENERAL DESCRIPTION HORIZONTAL STABILIZER ELEVATORS The left and right elevators have a main and rear spar interconnected by profile ribs and covered by skin panels. The inboard half of the elevator also incorporates a front spar installed with a leading edge sealing strip. The elevators are moved directly by hydraulic power. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 55 - STABILISERS Issue 6 - January 2023 Page 4 of 22 BOMBARDIER DHC 8-400 (PWC PW150) STABILIZERS GENERAL DESCRIPTION VERTICAL STABILIZER The vertical stabilizer is part of the aft/tail fuselage. The stabilizer has three vertical spars connected by horizontal ribs, and covered with skin panels. The vertical spar members are shaped at the lower end to form the integral main frames of the aft/tail fuselage. The leading edge has pneumatic de-icer boots installed. The vertical stabilizer is an airfoil that stabilizes movement of the aircraft around the vertical (yaw) axis. The rudder is a primary flight control surface that is attached to the rear spar of the vertical stabilizer. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 55 - STABILISERS Issue 6 - January 2023 Page 5 of 22 BOMBARDIER DHC 8-400 (PWC PW150) STABILIZERS GENERAL DESCRIPTION VERTICAL STABILIZER RUDDER The rudder has a fore rudder and a trailing rudder. The fore rudder is attached to the vertical stabilizer rear spar, and the trailing rudder is attached to the trailing edge of the fore rudder. The fore rudder is moved directly by hydraulic power. Mechanical linkage transmits fore rudder movement to the trailing rudder. Both rudders are constructed of spars and profile ribs covered by skin panels. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 55 - STABILISERS Issue 6 - January 2023 Page 6 of 22 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - STABILIZERS - GENERAL LAYOUT TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 55 - STABILISERS Issue 6 - January 2023 Page 7 of 22 BOMBARDIER DHC 8-400 (PWC PW150) STABILIZERS The skin panels are made from aluminium alloy sheet, clad on the outer surface, and chem-milled on the bare inner surface. The front and rear spar caps are made from aluminium alloy extrusions. The spar webs and formed members are made from clad aluminium-alloy sheet. Machined fittings and some of the ribs are made from aluminium alloy forgings. DETAILED DESCRIPTION HORIZONTAL STABILIZER The horizontal stabilizer is an airfoil that stabilizes movement of the aircraft around the lateral (pitch) axis. The horizontal stabilizer has these structures: • • • • • Box Structure Horizontal Stabilizer Leading Edge Tip Fairing Structure Elevator Attachment Horizontal Stabilizer Access Panels HORIZONTAL STABILIZER LEADING EDGE The horizontal stabilizer leading edges are of a composite construction in two sections per side, installed with locators to prevent incorrect installation, and have pneumatic de-icer boots installed. TIP FAIRING STRUCTURE The tip fairing structure is a cover for each end of the horizontal stabilizer. The fixed incidence horizontal stabilizer has front, mid, rear and auxiliary spars. They are connected to each other by profile ribs and covered with skin panels stiffened by riveted stringers. Each front, mid and rear spar has two fittings for attachment of the horizontal stabilizer at the upper end of the vertical stabilizer. The tip fairing structure is attached to the box structure and to the leading edge assemblies with countersunk-head screws. Hinge arms for the elevators are attached to the rear spar and adjacent ribs. Leading edges are of composite construction and have two sections per side. The leading edges are fitted with locators to prevent incorrect installation and have pneumatic de-icer boots installed. BOX STRUCTURE The box structure is the primary structure of the horizontal stabilizer. It is formed by front and rear spars, and 16 ribs. The top and bottom skin panels are the covers for the box structure. Span wise stringers give stiffness to the skin panels. The box structure is made from machined and formed aluminium-alloy materials. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 55 - STABILISERS Issue 6 - January 2023 Page 8 of 22 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - STABILIZERS - HORIZONTAL STABILIZER DETAIL TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 55 - STABILISERS Issue 6 - January 2023 Page 9 of 22 BOMBARDIER DHC 8-400 (PWC PW150) STABILIZERS The skin panels are joined together aft of the rear spar by a span wise trailing edge member. Each skin panel extends forward of the front spar but not fully over the elevator nose area. DETAILED DESCRIPTION HORIZONTAL STABILIZER Static dischargers are attached to the trailing edge near the outboard end of each elevator. ELEVATOR The spars, ribs, skins and trailing edge member are made from clad aluminium alloy sheet. The aluminium used to make the skins is chemically milled. The left and the right elevators are moveable flight control surfaces that control the movement of the aircraft around the lateral axis. The left and the right elevators are installed on the trailing edge of each side of the horizontal stabilizer. The elevators are attached to the horizontal stabilizer by hinges. The elevators have these structures: • • • • Box Structure Elevator Attachment Elevator Power Control Unit (PCU) and Linear Variable Differential Transformer (LVDT) Attachment Elevator Access Panels The left and right elevators each have a main and rear spar connected by profile ribs and covered by skin panels. The inboard half of the elevator also has a front spar fitted with a leading edge sealing strip. The elevator is attached to the horizontal stabilizer by four hinges. The hinges have low torque plain roller bearings. There is an inboard and an outboard hinge fitting and two more hinge fittings near the centre of the front spar. The three PCU attachment fittings are located near the centre hinge points. The LVDT attachment fitting is located near the inboard PCU attachment point. BOX STRUCTURE Each elevator has 28 ribs installed between the front and rear spars to make a box structure. The top and bottom skin panels are covers for the box structure. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 55 - STABILISERS Issue 6 - January 2023 Page 10 of 22 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - STABILIZERS - ELEVATOR LOCATOR TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 55 - STABILISERS Issue 6 - January 2023 Page 11 of 22 BOMBARDIER DHC 8-400 (PWC PW150) STABILIZERS DETAILED DESCRIPTION HORIZONTAL STABILIZER ELEVATOR CONTINUED ELEVATOR ACCESS PANELS Five panels on the forward edge of each elevator give access to the hinge, actuator and LVDT attachment points. The access panels are made from clad aluminium alloy sheet. ELEVATOR ATTACHMENT Each elevator is attached to the horizontal stabilizer by four hinge fittings. Each hinge fitting is made from aluminium alloy forgings. The hinge fittings are installed on the forward face of the front spar. The end hinge fittings one inboard, one outboard and two centre, have forked lugs. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 55 - STABILISERS Issue 6 - January 2023 Page 12 of 22 BOMBARDIER DHC 8-400 (PWC PW150) INTENTIONALLY LEFT BLANK TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 55 - STABILISERS Issue 6 - January 2023 Page 13 of 22 BOMBARDIER DHC 8-400 (PWC PW150) STABILIZERS DETAILED DESCRIPTION VERTICAL STABILIZER The vertical stabilizer is an airfoil that stabilizes movement of the aircraft around the vertical yaw axis. The vertical stabilizer has these components: • • • Vertical Stabilizer Leading Edge Vertical Stabilizer Fairing Vertical Stabilizer Access Panels The vertical stabilizer is part of the empennage. The stabilizer has three vertical spars connected by horizontal ribs and covered with skin panels. The vertical spar members are shaped at the lower end to form the main frames of the empennage. The leading edge has pneumatic de-icer boots installed. VERTICAL STABILIZER LEADING EDGE The vertical stabilizer leading edge is attached to the vertical stabilizer. It fairs with the aft dorsal fin at the lower end and with the vertical stabilizer fairing at the upper end. The vertical stabilizer leading edge also contains the HF antenna. The vertical stabilizer leading edge is made from composite materials. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 55 - STABILISERS Issue 6 - January 2023 Page 14 of 22 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - STABILIZERS - VERTICAL STABILIZER LEADING EDGE TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 55 - STABILISERS Issue 6 - January 2023 Page 15 of 22 BOMBARDIER DHC 8-400 (PWC PW150) STABILIZERS DETAILED DESCRIPTION VERTICAL STABILIZER FAIRING The vertical stabilizer fairing is a combination of aerodynamic fairings for anti buffeting. It starts at the top of the vertical stabilizer leading edge and continues aft to the rear of the horizontal stabilizer. The vertical stabilizer fairing is made from composite materials. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 55 - STABILISERS Issue 6 - January 2023 Page 16 of 22 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - STABILIZERS - VERTICAL STABILIZER FAIRING TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 55 - STABILISERS Issue 6 - January 2023 Page 17 of 22 BOMBARDIER DHC 8-400 (PWC PW150) STABILIZERS The leading edge parts are made from clad aluminium-alloy sheet. DETAILED DESCRIPTION FORE RUDDER BOX STRUCTURE VERTICAL STABILIZER The fore rudder box structure has 26 ribs attached to the front and rear spar assemblies. RUDDER The top and bottom closing ribs are canted to align with the profile of the vertical stabilizer fairings and the tail cone. Left and right skin panels cover the box structure. The rudder is a moveable flight control surface that controls movement of the aircraft around the vertical axis. The front and rear spar assemblies are made from clad aluminium-alloy sheet and machined aluminium-alloy extrusions. The rudder is a primary flight control surface that is attached to the rear spar of the vertical stabilizer. The ribs are made from clad aluminium-alloy sheet. The rib at the hinge locations are also reinforced with machined aluminium alloy members. The rudder has these components: The skin panels are made from clad aluminium-alloy sheet. • • • • Leading Edge Box Structure Rudder Attachment Rudder Access Panels The rudder has a fore rudder and a trailing rudder. The fore rudder is attached to the vertical stabilizer rear spar. The fore rudder is moved directly by hydraulic power. Mechanical linkage transmits fore rudder movement to the trailing rudder. Both rudders are constructed of spars and profile ribs covered with skin panels. FORE RUDDER LEADING EDGE The fore rudder leading edge section has 11 nose ribs attached to the forward face of the front spar. Upper and lower skin panels cover the leading edge section. The leading edge skin panels do not fully close the nose area, they are cut away to give access to the attachment points. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 55 - STABILISERS Issue 6 - January 2023 Page 18 of 22 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - STABILIZERS - FORE RUDDER LOCATOR TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 55 - STABILISERS Issue 6 - January 2023 Page 19 of 22 BOMBARDIER DHC 8-400 (PWC PW150) STABILIZERS DETAILED DESCRIPTION VERTICAL STABILIZER RUDDER CONTINUED TRAILING RUDDER LEADING EDGE The trailing rudder leading edge is attached to the trailing edge of the fore rudder. The trailing rudder leading edge section has 10 nose ribs attached to the forward face of the front spar. TRAILING RUDDER BOX STRUCTURE The trailing rudder box structure has 30 ribs attached to the front and rear spar assemblies. Three static dischargers are installed near the top of the trailing rudder trailing edge. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 55 - STABILISERS Issue 6 - January 2023 Page 20 of 22 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - STABILIZERS - TRAILING RUDDER TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 55 - STABILISERS Issue 6 - January 2023 Page 21 of 22 BOMBARDIER DHC 8-400 (PWC PW150) INTENTIONALLY LEFT BLANK TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 55 - STABILISERS Issue 6 - January 2023 Page 22 of 22