DOC AIRBUS | AMM A320FAIR INTAKE COWL - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
1. General
The engine air intake cowl structure is an interchangeable aerodynamically faired assembly. It is mounted to the forward face of the engine fan case A1 flange.
The assembly is composed of:
** ON A/C NOT FOR ALL The engine air intake cowl structure is an interchangeable aerodynamically faired assembly. It is mounted to the forward face of the engine fan case A1 flange.
Air Intake Cowl (1100KM1, 1100KM2)The assembly is composed of:
- an inner and outer barrel,
- a nose lip,
- a forward and an aft bulkhead.
- the anti-icing ducting,
- the engine control unit cooling inlet and exhaust,
- the interphone/ground jack,
- the T2 sensor,
- hoisting provisions,
- pip pin receptacles for the intake cover.
2. Description
A. Air Intake Cowl Configuration
The outer barrel of the air intake cowl is made of two panels of composite construction.
The inner barrel consists of:
The outer barrel of the air intake cowl is made of two panels of composite construction.
The inner barrel consists of:
- three acoustically treated panels. The panels are structural, bonded and repaceable. They are installed with mechanical fasteners,
- an engine attach ring,
- 24 identical attach fittings,
- a fire shield aft of the aft bulkhead.
B. Air Intake Cowl Anti-icing
The nose lip assembly consists of an outer lip skin and bulkhead. The lip skin and bulkhead comprise the anti-icing "D" duct. A swirl nozzle is mounted in the "D" duct for distribution of the anti-icing air into the "D" duct. A supply tube supplies the anti-icing air to the swirl nozzle. The supply tube penetrates the "D" duct bulkhead. A slip joint is provided at the "D" duct bulkhead to allow for duct thermal expansion.
Engine bleed air comes into the nose lip cavity through the swirl nozzle.
The air exits into the air intake cowl cavity aft of the "D" duct bulkhead : the air passes through openings in the "D" duct bulkhead inner cap.
The air exhausts overboard through a flush exit duct in the outer barrel.
A deflector is provided at the "D" duct exit. It prevents direct anti-icing air impingement on the forward portion of the acoustic inner barrel panels. The system is capable of operation under all ground and flight conditions.
The nose lip assembly consists of an outer lip skin and bulkhead. The lip skin and bulkhead comprise the anti-icing "D" duct. A swirl nozzle is mounted in the "D" duct for distribution of the anti-icing air into the "D" duct. A supply tube supplies the anti-icing air to the swirl nozzle. The supply tube penetrates the "D" duct bulkhead. A slip joint is provided at the "D" duct bulkhead to allow for duct thermal expansion.
Engine bleed air comes into the nose lip cavity through the swirl nozzle.
The air exits into the air intake cowl cavity aft of the "D" duct bulkhead : the air passes through openings in the "D" duct bulkhead inner cap.
The air exhausts overboard through a flush exit duct in the outer barrel.
A deflector is provided at the "D" duct exit. It prevents direct anti-icing air impingement on the forward portion of the acoustic inner barrel panels. The system is capable of operation under all ground and flight conditions.
C. Air Intake Cowl Access
There are a total of five access doors in the air intake cowl.
Four provide access to the inner volume:
The fifth access door is located on the forward bulkhead at about the 6 o'clock position. It gives access into the nose lip "D" duct.
This fifth door is reached through the fourth access door.
There are a total of five access doors in the air intake cowl.
Four provide access to the inner volume:
- three are located on the aft bulkhead,
- the fourth is located on the outer barrel. It combines the anti-ice discharge vent.
The fifth access door is located on the forward bulkhead at about the 6 o'clock position. It gives access into the nose lip "D" duct.
This fifth door is reached through the fourth access door.
D. Air Intake Cowl Acoustic Treatment
The inner barrel is a bonded aluminum honeycomb structure. Total acoustic area is approximately 27 square feet.
The inner barrel is a bonded aluminum honeycomb structure. Total acoustic area is approximately 27 square feet.
E. Air Intake Cowl Structure
The majority of the internal pressure loads and external air loads are taken in hoop tension through the inner barrel skins.
Longitudinal and transverse loads are distributed into the fan case forward flange through a bolted joint.
These loads are due to:
The acoustic panels are structural and, as such, carry air intake cowl loads. The intake cowl aft bulkhead forms a land for the fan cowl leading edge.
The majority of the internal pressure loads and external air loads are taken in hoop tension through the inner barrel skins.
Longitudinal and transverse loads are distributed into the fan case forward flange through a bolted joint.
These loads are due to:
- the air intake structure own inertia as well as,
- any internal or external loads not taken in hoop tension.
The acoustic panels are structural and, as such, carry air intake cowl loads. The intake cowl aft bulkhead forms a land for the fan cowl leading edge.
NOTE: A pin provides ease of alignment.
Four nut plates over 24 attachment bolts on the engine flange enable easy removal/installation of the engine air intake.
Four nut plates over 24 attachment bolts on the engine flange enable easy removal/installation of the engine air intake.