DOC AIRBUS | AMM A320FCOWL - FAN - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
1. General
The left and right fan cowl assemblies enclose the engine fan case between the air intake cowl and the thrust reverser. Each door is interchangeable from one engine to the other and is attached to the pylon by three hinges. A fourth hinge at the forward end of each door connects to a common tie link between each door. The doors are latched together along the bottom center line by four adjustable tension hook latches.
SBN 71-0331:
A lockable latch is installed in the forward position (latch No. 1) that must be opened, closed and locked with a key and flag assembly. The key cannot be removed when the latch is open. The key and flag assembly must be stowed on the aircraft. A deflection plate is installed on the opposite adjustable keeper to make sure that the lockable latch engages correctly with the adjustable keeper.
To improve take-off performance, aerodynamic strakes are installed on the inboard and outboard fan cowl of each nacelle.
The strakes are attached to the cowl with Hi-Loks and jointing compound.
** ON A/C NOT FOR ALL The left and right fan cowl assemblies enclose the engine fan case between the air intake cowl and the thrust reverser. Each door is interchangeable from one engine to the other and is attached to the pylon by three hinges. A fourth hinge at the forward end of each door connects to a common tie link between each door. The doors are latched together along the bottom center line by four adjustable tension hook latches.
Fan Cowl DoorsSBN 71-0331:
A lockable latch is installed in the forward position (latch No. 1) that must be opened, closed and locked with a key and flag assembly. The key cannot be removed when the latch is open. The key and flag assembly must be stowed on the aircraft. A deflection plate is installed on the opposite adjustable keeper to make sure that the lockable latch engages correctly with the adjustable keeper.
To improve take-off performance, aerodynamic strakes are installed on the inboard and outboard fan cowl of each nacelle.
The strakes are attached to the cowl with Hi-Loks and jointing compound.
2. Description
The fan cowl doors are constructed from a sandwich of carbon fiber composite skins, an aluminum honeycomb core and a layer of copper mesh for lightning protection.
Both doors are supported on lands formed in the air intake cowl at the front and in the thrust reverser (Ref. chapter 78-30-00) at the rear. The forward land incorporates alignment fittings.
The fan cowl doors are constructed from a sandwich of carbon fiber composite skins, an aluminum honeycomb core and a layer of copper mesh for lightning protection.
Both doors are supported on lands formed in the air intake cowl at the front and in the thrust reverser (Ref. chapter 78-30-00) at the rear. The forward land incorporates alignment fittings.
A. Opening/Closing
Two hold-open rods engage into brackets on the engine fan case to support the fan cowl doors in the 55 degrees open position for ground maintenance only.
A pressure relief door is located in the right fan cowl door to limit fan case compartment (zone 1) pressure.
Two hold-open rods engage into brackets on the engine fan case to support the fan cowl doors in the 55 degrees open position for ground maintenance only.
A pressure relief door is located in the right fan cowl door to limit fan case compartment (zone 1) pressure.
B. Access Doors
A door in the right fan cowl door (also used as a pressure relief door) provides access to the starter valve manual override.
Two access doors in the left fan cowl provide access for:
A door in the right fan cowl door (also used as a pressure relief door) provides access to the starter valve manual override.
Two access doors in the left fan cowl provide access for:
- Oil fill and sight glass door,
- Master chip detector.
C. Provision for Nacelle Ventilation and Accessory Cooling
Air outlet vents are located on the bottom centerline of each door to exhaust fan compartment ventilation air.
The right hand door has an outlet grille to exhaust cooling air from the air cooled oil cooler, an air outlet to exhaust air from the gearbox de-oiler.
Air outlet vents are located on the bottom centerline of each door to exhaust fan compartment ventilation air.
The right hand door has an outlet grille to exhaust cooling air from the air cooled oil cooler, an air outlet to exhaust air from the gearbox de-oiler.
D. Fan Cowl Structure
The internal pressure loads and external air loads are reacted through the structure and transmitted into the pylon through the hinge fittings.
The door lands provide support to prevent deflection.
The fan cowl doors, when completely latched, provide a continuous load path for hoop stresses.
A silicon rubber seal along the bottom centerline and a pylon-mounted seal at the pylon interface adjacent to the door hinges prevent air leakage.
The fan cowl doors are fireproof above the 90 degrees radial.
The cowl doors are designed to be structurally adequate when any one latch is unlatched or any one hinge failed. A nacelle overpressurization condition due to a pneumatic duct failure is released through the pressure relief door.
The internal pressure loads and external air loads are reacted through the structure and transmitted into the pylon through the hinge fittings.
The door lands provide support to prevent deflection.
The fan cowl doors, when completely latched, provide a continuous load path for hoop stresses.
A silicon rubber seal along the bottom centerline and a pylon-mounted seal at the pylon interface adjacent to the door hinges prevent air leakage.
The fan cowl doors are fireproof above the 90 degrees radial.
The cowl doors are designed to be structurally adequate when any one latch is unlatched or any one hinge failed. A nacelle overpressurization condition due to a pneumatic duct failure is released through the pressure relief door.
E. Fan Cowl Materials:
The typical fan cowl door construction is shown in
In the fan cowl there are provisions for hinge fittings, latch fittings, access doors, and air vents.
The typical fan cowl door construction is shown in
In the fan cowl there are provisions for hinge fittings, latch fittings, access doors, and air vents.