DOC AIRBUS | AMM A320FPYLONS - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
1. General
The purpose of the engine pylon mounted underneath each wing is:
** ON A/C NOT FOR ALL The purpose of the engine pylon mounted underneath each wing is:
- to support the engine
- to transmit the engine thrust to the aircraft
- to route and support all the systems related to the engine (electrical wiring, hydraulic and fuel lines up to the engine and all return lines).
2. Description
Engine Pylon DescriptionA. Pylon Structure
(1) Pylon box
The pylon box is the primary structure which supports the engine at two points and is attached at two points to the half wing.
The pylon box is the primary structure which supports the engine at two points and is attached at two points to the half wing.
(2) Forward fairing
The forward fairing is the fixed secondary structure.
The forward fairing is the fixed secondary structure.
(3) Pylon-to-wing center fillets
The pylon-to-wing center fillets consist of access panels providing the junction between the wing lower surface and the pylon box.
The pylon-to-wing center fillets consist of access panels providing the junction between the wing lower surface and the pylon box.
(4) Aft fairing
The aft fairing is a removable secondary structure composed of two sections :
The aft fairing is a removable secondary structure composed of two sections :
- a main fairing situated at the rear of the pylon box
- a movable fairing underneath the flap.
(5) Lower fairing
The lower fairing is a removable secondary structure situated between the pylon box and the engine nozzle.
The lower fairing is a removable secondary structure situated between the pylon box and the engine nozzle.
(6) Pylon-to-nacelle junction
B. Systems
The pylon supports all the following systems related to the engine :
The pylon supports all the following systems related to the engine :
(2) Fire extinguishing/detection and air system
(3) Fuel
All pylon bottom surfaces adjacent to the nacelle are fire walls.
All pylon bottom surfaces adjacent to the nacelle are fire walls.
C. Compartment
For safety purposes the engine pylon is divided into 7 compartments, each houses a particular type of equipment
For safety purposes the engine pylon is divided into 7 compartments, each houses a particular type of equipment
| ------------------------------------------------------------------------------- |
| ! DESIGNATION ! ZONE ! SYSTEMS ! |
| !--------------------------------- !----------!-------------------------------! |
| !Forward ! A ! Flammable Fluids (Fuel, ! |
| !Fairing ! ! Hydraulics) ! |
| ! ! B1 ! Bleed Air (High And Low ! |
| ! ! ! Temperatures) ! |
| ! ! B2 ! Electrics ! |
| !----------------------------------!----------!-------------------------------! |
| !Pylon Box ! C ! Hydraulics Without Couplings ! |
| ! ! ! Extinguishers ! |
| !----------------------------------!----------!-------------------------------! |
| !Rearward Secondary ! D ! Hydraulics ! |
| !Structure ! ! Limited electrics ! |
| !----------------------------------!----------!-------------------------------! |
| !Lower Fairing ! E ! None ! |
| !----------------------------------!----------!-------------------------------! |
| !Pylon to Wing ! F ! Fuel (No Couplings) ! |
| !Center Fillets ! ! Electrics ! |
| ! ! ! Bleed Air (Low Temperature) ! |
| ------------------------------------------------------------------------------- |
D. Ventilation and Drainage
Each compartment is separately ventilated, separately drained overboard.
The air of each zone is renewed
Each compartment is separately ventilated, separately drained overboard.
The air of each zone is renewed
(1) Compartment A
Air inlet through the edges of the removable panels (not sealed).
Air exit and overboard drain at the trailing edge.
Air inlet through the edges of the removable panels (not sealed).
Air exit and overboard drain at the trailing edge.
(2) Compartment B1
Air bleed from precooler supply ducting.
Air exit through louvers fitted with an overtemperature detector.
Drain : unsealed structure.
Air bleed from precooler supply ducting.
Air exit through louvers fitted with an overtemperature detector.
Drain : unsealed structure.
(3) Compartment B2
Vent and drain : unsealed structure.
Vent and drain : unsealed structure.
(4) Compartment C
Air intake incorporated in the access door located on the side of the pylon between RIBs 2 and 3.
Air intake incorporated in the access door located on the side of the pylon between RIBs 2 and 3.
(5) Compartment D
Vent and drain : unsealed structure.
Vent and drain : unsealed structure.
(6) Compartment E
Vent and drain : unsealed structure.
Vent and drain : unsealed structure.
(7) Compartment F
Vented with the wing vent system.
Air exits through a hole in the secondary structure on the side of the pylon panel between RIBs 5 and 7.
Air exit and overboard drain at the trailing edge.
Vented with the wing vent system.
Air exits through a hole in the secondary structure on the side of the pylon panel between RIBs 5 and 7.
Air exit and overboard drain at the trailing edge.