DOC AIRBUS | AMM A320FPYLON BOX - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
Primary Structure - Materials and Protections DescriptionA. Pylon Box Structure
The pylon box is damage tolerant and comprises:
The pylon box is damage tolerant and comprises:
- 1 lower spar made of corrosion resistant steel
- 1 forward upper spar made of special carbon steel
- 1 rearward upper spar made of special carbon steel
- 10 ribs, 4 of which introduce loads :
At pylon-to-engine attach fittings : RIB1 is made of corrosion resistant steel and RIB3 is made of titanium
At pylon-to-wing attach fittings : RIBs 4 to 10 made of titanium
RIBs 2, 5, 6, 7, 8, 9, are made of titanium.
B. Pylon-to-Wing Attach Fitting
The engine is installed on the wing by means of:
The engine is installed on the wing by means of:
- at RIB4, four shackles made of high tensile stainless steel and four sleeve/threaded pin assemblies
- a spigot fitting located in the aft upper spar between RIB4 and RIB5
- at RIB10 , four aft shackles made of titanium alloy and three sleeve/threaded pin assemblies.
C. Pylon-to-Engine Attach Fitting
The pylon-to-engine junction is provided by the forward attach fitting located at the forward end of the pyramid at RIB1.
The aft attach fitting is located at RIB3.
The forward attach fitting reacts to engine thrust, vertical and side load.
The aft attach fitting reacts to vertical and side loads, roll moments.
The pylon-to-engine junction is provided by the forward attach fitting located at the forward end of the pyramid at RIB1.
The aft attach fitting is located at RIB3.
The forward attach fitting reacts to engine thrust, vertical and side load.
The aft attach fitting reacts to vertical and side loads, roll moments.
D. Pylon Box Components
The pylon box is fitted with :
The pylon box is fitted with :
- Thrust reverser cowl hinge fittings.
- Attachment bracket for thrust reverser cowl opening jack.
- Attachment bracket for rearward secondary structure.
- Provision to mount ground support equipment required for engine hoisting.
All components of the pylon box structure are attached by means of close fit corrosion resistant steel bolts or lock bolts.
E. Doors
The pylon box is fitted with four doors giving access to the various systems:
The pylon box is fitted with four doors giving access to the various systems:
- The forward access doors are located on each side of the pylon box between RIB2 and RIB3. They are made of light alloy and are attached by means of four screws.
- The aft access doors are located on each side of the pylon box between RIB5 and RIB6. They are made of carbon fiber reinforced plastic and honeycomb web sandwich type and are attached by means of four captive screws.