DOC AIRBUS | AMM A320FTHRUST REVERSER STRUCTURE - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL
1. General
The thrust reverser is attached to the pylon immediately aft of the engine fan case. When stowed, the reverser forms a continuation of the engine fan exhaust nozzle and when deployed, the reverser directs the fan exhaust forwards.
The reverser is constructed in two halves that form a bifurcated duct. The reverser halves are hinged at the top to the pylon, clamped to the aft outer flange of the fan case and latched along the bottom centerline.
The thrust reverser is attached to the pylon immediately aft of the engine fan case. When stowed, the reverser forms a continuation of the engine fan exhaust nozzle and when deployed, the reverser directs the fan exhaust forwards.
Thrust Reverser Structure - Exploded ViewThe reverser is constructed in two halves that form a bifurcated duct. The reverser halves are hinged at the top to the pylon, clamped to the aft outer flange of the fan case and latched along the bottom centerline.
A. Removal/Installation
The thrust reverser incorporates hoisting points for removal and installation of the thrust reverser C-duct assemblies with the use of a three point handling sling.
When installing the thrust reverser, pylon hinge attachment hardware is accessible from the outside of the C-duct by removal of the upper hinge fitting access fairing. The only rigging required when installing a thrust reverser assembly is checking/adjusting of the main C-duct latches. These latches are accessible without opening any access panels and can be adjusted without opening the C-ducts.
Replacement of a thrust reverser blocker door assembly or a blocker door latch mechanism only requires rigging of the door "step" condition between the fan cowl and the thrust reverser blocker door. The blocker door latch olive button bracket is serrated to ease this operation (Ref. AMM D/O 78-31-00-00).
The replacement of thrust reverser stow switches, deploy switches, or blocker door actuators does not entail subsequent rigging.
The thrust reverser incorporates hoisting points for removal and installation of the thrust reverser C-duct assemblies with the use of a three point handling sling.
When installing the thrust reverser, pylon hinge attachment hardware is accessible from the outside of the C-duct by removal of the upper hinge fitting access fairing. The only rigging required when installing a thrust reverser assembly is checking/adjusting of the main C-duct latches. These latches are accessible without opening any access panels and can be adjusted without opening the C-ducts.
Replacement of a thrust reverser blocker door assembly or a blocker door latch mechanism only requires rigging of the door "step" condition between the fan cowl and the thrust reverser blocker door. The blocker door latch olive button bracket is serrated to ease this operation (Ref. AMM D/O 78-31-00-00).
The replacement of thrust reverser stow switches, deploy switches, or blocker door actuators does not entail subsequent rigging.
2. Description
A. Fixed Structure
Each thrust Reverser half is supported from the pylon by three hinges.
These hinges are integral with a machined aluminium beam which runs along the upper portion of the thrust reverser.
Each thrust Reverser half is supported from the pylon by three hinges.
These hinges are integral with a machined aluminium beam which runs along the upper portion of the thrust reverser.
(1) Outer Barrel
The outer barrel forms the fan flow outer contour. In stow position, blocker doors are parts of the outer cowl. The outer barrel has a composite honeycomb structure. It consists of graphite skins bonded to Nomex honeycomb.
The outer barrel forms the fan flow outer contour. In stow position, blocker doors are parts of the outer cowl. The outer barrel has a composite honeycomb structure. It consists of graphite skins bonded to Nomex honeycomb.
(2) Inner Barrel
The inner barrel forms the fan flow inner contour and engine outer envelope.
The thrust reverser inner barrel panel incorporates four flush inlet holes in the forward section that allow cooling air from the fan duct into the engine core compartment. These holes, along with the LPT cooling system discharge air, provide the cooling and ventilation for the engine core compartment. Air passes through the compartment and is exhausted out of the annular opening between the thrust reverser and the core nozzle. Right thrust reverser incorporates a flush inlet for precooler cold air. The inner barrel is acoustically treated. It consists of aluminium perforated face sheet bonded to aluminium honeycomb core. The inner (engine side) surface of the inner barrel is treated for thermal/fire protection. The aft section of the inner barrel is protected with thermal blanket covered with a titanium sheet.
The forward section of the inner barrel is protected with MA25 S ablative coating.
The inner barrel forms the fan flow inner contour and engine outer envelope.
The thrust reverser inner barrel panel incorporates four flush inlet holes in the forward section that allow cooling air from the fan duct into the engine core compartment. These holes, along with the LPT cooling system discharge air, provide the cooling and ventilation for the engine core compartment. Air passes through the compartment and is exhausted out of the annular opening between the thrust reverser and the core nozzle. Right thrust reverser incorporates a flush inlet for precooler cold air. The inner barrel is acoustically treated. It consists of aluminium perforated face sheet bonded to aluminium honeycomb core. The inner (engine side) surface of the inner barrel is treated for thermal/fire protection. The aft section of the inner barrel is protected with thermal blanket covered with a titanium sheet.
The forward section of the inner barrel is protected with MA25 S ablative coating.
(3) Forward frame
The forward frame supports all the hydraulic system (HCU, latches, actuators), the stow switches and the "V" blade which interfaces with the fan frame (Ref. 78-36-00).
The forward frame supports all the hydraulic system (HCU, latches, actuators), the stow switches and the "V" blade which interfaces with the fan frame (Ref. 78-36-00).
(4) Ramp
The ramp serves to deflect the air when the blocker doors are deployed. It is a composite honeycomb structure. Graphite composite skins are bonded to aluminium honeycomb.
The ramp serves to deflect the air when the blocker doors are deployed. It is a composite honeycomb structure. Graphite composite skins are bonded to aluminium honeycomb.
(6) Pressure relief
The reverser incorporate a pressure relief system. This system prevents permanent structural deformation in the event of a single bleed duct rupture in combination with external air loading throughout the flight envelope.
It consists of an annular opening between the thrust reverser and the core compartment.
The reverser incorporate a pressure relief system. This system prevents permanent structural deformation in the event of a single bleed duct rupture in combination with external air loading throughout the flight envelope.
It consists of an annular opening between the thrust reverser and the core compartment.
(1) General
Two blocker doors are installed onto each half reverser. Each blocker door rotates around pins secured onto upper and lower fittings located at 3 and 9 o'clock. All the blockers doors are actuated by hydraulic actuators and rotate independently.
Two blocker doors are installed onto each half reverser. Each blocker door rotates around pins secured onto upper and lower fittings located at 3 and 9 o'clock. All the blockers doors are actuated by hydraulic actuators and rotate independently.
NOTE: All doors are different.
(3) Efflux Pattern
The reverser is designed in such a way that:
The reverser is designed in such a way that:
- there is no direct inpingement of the flow onto the wing under normal operating conditions,
- no occurrences of reingestion under normal operating conditions,
- a minimum of unbalanced thrust forces.
The efflux pattern is determined by different means: - the shape of the reverser openings,
- the height and shape of the kicker-plate at the leading edge of each reverser blocker door,
- shape of the forward internal skin of the reverser blocker door,
- side walls along the edge of the blocker doors.
The configuration of the right thrust reverser is different from the left one.
(4) Seals
The characteristics of the seals are:
The characteristics of the seals are:
- large diameter seal,
- pressurized seal,
- silicone + fiber glass material,
- no seal scrubbing during door motion,
- seal in compression,
- each seal is particular to one component with no angle.