GENERAL GENERAL
The horizontal stabilizer gives pitch stability and pitch control to the A/C.
It is installed at th e rear of the fuselage and mounted at the rear of section 19.
It is 30.372 m (99.66 ft) wide.
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GENERAL
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HORIZONTAL STABILIZER DESCRIPTION (3)
- the leading edge, - the trailing edge, - the tip,
- the fuselage attachment,
- and the elevators, each being split into an inner and a outer section.
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GENERAL - GENERAL ARRANGEMENT (CONT'D)
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HORIZONTAL STABILIZER DESCRIPTION (3)
SPAR BOX SPAR BOX
STRUCTURE LAYOUT STRUCTURE LAYOUT
The complete spar box is made of LH and RH sub assemblies, put together at the center joint. Each sub assembly is made of top and bottom skin panels, front and rear spars, and twenty-five ribs. The fuselage attachment is composed of the trim screw jack fitting at the forward center spar box and two pivot attachments on the rear spar.
The spar box is used as ballast fuel tank between ribs 8LH and RH.
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SPAR BOX - STRUCTURE LAYOUT
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HORIZONTAL STABILIZER DESCRIPTION (3)
SP
SPAR BOX AR BOX (continued)(continued)
SKIN PANELS AND COVERS SKIN PANELS AND COVERS
The top and bottom skin panels are made on the same principle.
Carbon Fiber Reinforced Plastic (CFRP) is used for the conception.
Co-bonded T-shape stringers, which are parallel to the rear spar, make the skin panels stronger.
The LH bottom skin panel has ten manholes for accessibility, the RH bottom skin panel has eleven manholes, including one NACA. They are positioned at stringers 5 and 13.
The manhole covers are made of CFRP thermoplastic. In fuel tank area, excepted inside the fuselage, an aluminium protective plate is screwed on the fuel tank covers to protect it about the impact.
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SPAR BOX - SKIN PANELS AND COVERS
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HORIZONTAL STABILIZER DESCRIPTION (3)
SP
SPAR BOX AR BOX (continued)(continued) SPARS
SPARS
The spar box has two C-shape spars made of CFRP.
Vertical T-shape stiffeners are bonded to the front and rear spar aft faces.
Horizontal T-shape stiffeners are bonded to the forward face of the front spar.
In the dry zone, two access holes give access to each rib bay.
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SPAR BOX - SPARS
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HORIZONTAL STABILIZER DESCRIPTION (3)
SP
SPAR BOX AR BOX (continued)(continued) CENTER JOINT CENTER JOINT
The RH side and LH side of the spar box are joined at Rib 1 in a single joint.
To get this junction, the following elements are used:
- six upper and six lower Tees (titanium alloy) joini ng the skin panels, - five upper and five lower Tees (titanium alloy) joining the upper and lower tees,
at the forward part:
- one inner T profile (titanium alloy) joining Rib 1 to front fitting, - four plates (titanium alloy) joining the front spar flanges to the front fitting,
- a front fitting (aluminum alloy) joining the front spar webs, at the aft part:
- a rear outer plate (aluminum alloy) joining the rear spar webs, - and two rear inner profiles (titanium alloy), joining Rib 1 to the rear spar webs.
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SPAR BOX - CENT ER JOINT
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HORIZONTAL STABILIZER DESCRIPTION (3)
SP
SPAR BOX AR BOX (continued)(continued) RIBS
RIBS
The spar box has twenty-five ribs per side and a rib at the center joint.
All of them are riveted to the skin panels and the spars.
The center joint rib 1 connects the LH side and RH side of the spar box to make one unit. It has a web and stiffeners made of CFRP.
Ribs 2 and 3 are truss work assemblies, made with CFRP diagonal bars and formers.
Ribs 4 to 25 have a web and stiffeners made of CFRP.
Rib 26 has a web and stiffeners made of CFRP.
Ribs 2 to 25 are riveted:
- to the skin panels with titanium alloy clips, - and to the spars with aluminum alloy T-fittings.
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SPAR BOX - RIBS
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HORIZONTAL STABILIZER DESCRIPTION (3)
FUSELAGE
FUSELAGE ATTATTACHMENTACHMENT The support fittings are installed:
- on the front spar by the screw jack fitting, attached onto the center joi nt at Rib 1, and connecting the THS to the trim actuator,
- on the rear spar by the rear support fittings (two pivot points) attached onto 4 LH and RH ribs. These fittings fulfill the rotation of the THS;
rotation axes carry possible side loads.
All fittings are made of aluminum alloy.
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FUSELAGE ATTACHMENT
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HORIZONTAL STABILIZER DESCRIPTION (3)
LEADING EDGE LEADING EDGE
The leading edge has an aerodynamic chape at the front of the THS. On each side of the THS centerline, the leading edge is composed of eight replaceable sections. Each section has:
- top and bottom panels, made of CFRP skins bonded to a honeycomb core,
- a diagonal and a vertical s pars, made of aluminum alloy, and riveted to the panels,
- ribs, manufactured from CFRP, attached with anchor nuts to the panels , - and a D-nose panel made from aluminum alloy up to MSN 006, from GLARE from MSN 7 and subsequent. The outer D nose section remains aluminum alloy on all MSN's due to its double curvature.
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LEADING EDGE
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HORIZONTAL STABILIZER DESCRIPTION (3)
TRAILING EDGE TRAILING EDGE
The trailing edge is an aerodynamic surface between the THS spar box and the elevators.
On each side of the THS centerline, seven upper and lower trailing edge access panels are supported by ribs.
The trailing edge has:
- ten intermediate ribs made from CFRP, which give support the trailing edge access panels made of CFRP,
- ten elevator hinge ribs (four outer and six inner) with a web made from CFRP and a fitting made from aluminum alloy. These 10 hinge ribs support the trailing edge access panels and give attachment to the elevators,
- four elevator actuator fittings (two fittings per elevator) made of aluminum alloy.
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TRAILING EDGE
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HORIZONTAL STABILIZER DESCRIPTION (3)
TRAILING EDGE ACCESS TRAILING EDGE ACCESS PANELPANELSS
The trailing edge is divided into seven upper and lower access panels by side.
The lower access panels are hinged to give access to the elevator leading edge and actuators.
The upper access panels are riveted except panels 1, 2 and 5. These panels are screwed.
Panels 2 and 5 give access to actuator areas, while panel 1 needs to be removed to give access for THS section 19.
The upper and lower access panels are made of CFRP sandwich; the upper panels are hinged to get access to the elevator leading edge and actuators.
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TRAILING EDGE ACCESS PANELS
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HORIZONTAL STABILIZER DESCRIPTION (3)
TIP AND APRON TIP AND APRON
The THS tip is a metallic element attached to the spar box (top and bottom skins and to the front and rear spar).
It is also connected to the trailing edge Rib 10 with a removable joint.
This part is interchangeable.
The tip structure includes:
- skin panels, - spars, - ribs,
- 3 hoisting points (not shown), - and 2 lower access covers.
The THS tip is made of aluminum alloy.
The horizontal stabilizer aprons have an aerodynamic seal between the horizontal stabilizer and the fuselage. Each apron has three sections, an upper, a lower and a forward section. The aprons are made of CFRP. To minimize friction between the aprons and the fuselage, the contact edge of each apron has a segmented slide lip of polytetra-fluorethylene (PTFE).
The apron support fittings are made of aluminum alloy.
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TIP AND APRON
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HORIZONTAL STABILIZER DESCRIPTION (3)
ELEVATORS ELEVATORS
The THS has two elevators per side:
- an inner (shown on the illustration) - an outer.
The structure of the inner elevator has a front spar, a top and a bottom skin panels and nine ribs. All these parts are made of CFRP.
Four hinge fittings attach the in ner elevator to the hinge arms of the THS and two actuator fittings. All fittings are made of aluminum alloy.
NOTE: Note: The outer elevator composition is based on the same principle but, has fifteen ribs and six elevator hinge fittings.
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ELEVATORS
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