DOC AIRBUS | AMM A320FEXHAUST - GENERAL - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
1. General
Primary air is the part of the air absorbed by the fan that enters the engine near the fan blade platform, continues through the Low Pressure (LP) and High Pressure (HP) compressors, the combustor, and the HP and LP turbines, and is accelerated and exhausted to the atmosphere through the turbine exhaust system.
The turbine exhaust flow path is formed by the inner surface of the exhaust nozzle and the outer surface of the exhaust plug.
Secondary air is the part of the air absorbed by the fan that is directly discharged from the outer portion of the fan, by-passes the core engine and flows through the thrust reverser to the atmosphere.
** ON A/C NOT FOR ALL Primary air is the part of the air absorbed by the fan that enters the engine near the fan blade platform, continues through the Low Pressure (LP) and High Pressure (HP) compressors, the combustor, and the HP and LP turbines, and is accelerated and exhausted to the atmosphere through the turbine exhaust system.
General Exhaust SystemThe turbine exhaust flow path is formed by the inner surface of the exhaust nozzle and the outer surface of the exhaust plug.
Secondary air is the part of the air absorbed by the fan that is directly discharged from the outer portion of the fan, by-passes the core engine and flows through the thrust reverser to the atmosphere.
- In the forward thrust mode, this by-pass air is accelerated and exhausted aft to the atmosphere by the exhaust nozzle, which is the duct formed by the inner surface of the translating cowl, by the inner fixed structure and by the outer surface of the exhaust nozzle.
- In the thrust reverser mode, blocker doors are deployed across the exhaust nozzle, redirecting the air in the forward direction, and the translating cowl is moved aft, exposing cascades which redirect the air toward the front of the engine. The pilot can command thrust reverser deployment only on the ground.
2. System Description
The exhaust system consists:
** ON A/C NOT FOR ALL The exhaust system consists:
- The collector nozzle system, (Ref. AMM D/O 78-10-00-00),
- The thrust reverser system, (Ref. AMM D/O 78-30-00-00).
3. Component Description
A. Collector Nozzle System
The collector nozzle system consists of two major components:
The collector nozzle system consists of two major components:
- Exhaust nozzle, (Ref. AMM D/O 78-12-00-00),
- Exhaust plug (forward and aft), (Ref. AMM D/O 78-11-00-00).
(1) Exhaust nozzle
The exhaust nozzle contains sub-assemblies of an inner skin and an outer cowl, it is mechanically connected to the engine.
On the upper quadrant, a metallic seal acts as an interface to the lower aft pylon fairing. This seal provides a fireproof barrier. Two blades improve the sealing between the lower aft pylon fairing and the exhaust nozzle.
On the lower part, the outer cowl skin provides the inner duct surface of the core ventilation zone at the interface with the aft of the inner fixed structure of the thrust reverser.
The exhaust nozzle contains sub-assemblies of an inner skin and an outer cowl, it is mechanically connected to the engine.
On the upper quadrant, a metallic seal acts as an interface to the lower aft pylon fairing. This seal provides a fireproof barrier. Two blades improve the sealing between the lower aft pylon fairing and the exhaust nozzle.
On the lower part, the outer cowl skin provides the inner duct surface of the core ventilation zone at the interface with the aft of the inner fixed structure of the thrust reverser.
(2) Exhaust plug
The exhaust plug consists of two sub-assemblies:
The aft plug section is attached to the front plug with bolts and nut-plates.
The engine center vent tube support is attached on the aft section of the aft plug.
The exhaust plug consists of two sub-assemblies:
- Front plug,
- Aft plug.
The aft plug section is attached to the front plug with bolts and nut-plates.
The engine center vent tube support is attached on the aft section of the aft plug.
B. Thrust Reverser System
The thrust reverser system consists:
The thrust reverser system is operated by hydraulic actuators powered by the aircraft hydraulic system.
It is controlled through Electronic Engine Control (EEC) from the cockpit by the aircraft throttle control lever position and by the flight/ground status provided by the Engine Interface Unit (EIU).
It includes an electrical tertiary lock system controlled through the SEC.
The thrust reverser system consists:
- Thrust reverser structure, (Ref. AMM D/O 78-32-00-00),
- Actuation system, (Ref. AMM D/O 78-31-00-00),
- Third line of defense system, (Ref. AMM D/O 78-37-00-00).
The thrust reverser system is operated by hydraulic actuators powered by the aircraft hydraulic system.
It is controlled through Electronic Engine Control (EEC) from the cockpit by the aircraft throttle control lever position and by the flight/ground status provided by the Engine Interface Unit (EIU).
It includes an electrical tertiary lock system controlled through the SEC.