DOC AIRBUS | AMM A320FAVIONICS COMPARTMENT - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
1. General
The avionics compartment is located in the underfloor nose section between Frames 1 and 24.
Its structure is as follows:
Each part is fitted with a door allowing access from the outside.
An access panel in the aft part of the avionics compartment allows communication with the passenger compartment.
** ON A/C NOT FOR ALL The avionics compartment is located in the underfloor nose section between Frames 1 and 24.
Its structure is as follows:
- Frames 1 to 9: the avionics compartment forward part, forward of the nose landing gear well, under the cockpit.
- Frames 0 to 20, R side and L side: the avionics compartment lateral left and lateral right parts, on each side of the nose gear well, under the cockpit and the forward passenger compartment.
- Frames 20 to 24: the avionics compartment aft part, aft of the nose gear well, under the forward passenger compartment.
Each part is fitted with a door allowing access from the outside.
An access panel in the aft part of the avionics compartment allows communication with the passenger compartment.
2. Component Location
** ON A/C NOT FOR ALL 
Avionics Compartment - Component Location.| FIN | FUNCTIONAL DESIGNATION | PANEL | ZONE | ACCESS DOOR | ATA REF |
|---|---|---|---|---|---|
| ** ON A/C ALL | |||||
| 70VU | ANN LT TEST UNIT | 126 | 93-00-00 | ||
| 90VU | FWD ELECTRONICS RACK | 121 | 93-00-00 | ||
| 90VU | FWD ELECTRONICS RACK | 121 | 93-00-00 | ||
| 103VU | RELAY BOX | 126 | 93-00-00 | ||
| 106VU | POWER CENTER-AC/DC EMERGENCY | 125 | 93-00-00 | ||
| 107VU | CONTACTOR BOX | 126 | 93-00-00 | ||
| 109VU | SHELF-WEATHER RADAR | 121 | 93-00-00 | ||
3. Description
A. Avionics Compartment - Forward Part
This part contains the following items of equipment:
This part contains the following items of equipment:
- Weather Radar Shelf 109VU
Between Frames 2 and 4, L side, there is a 16 MCU capacity rack for Weather Radar installation. - FWD Electronics Rack 90VU
Between Frames 7 and 8, there is a 95 MCU capacity transversal rack fitted with five shelves.
Space is provided for installation of non-Arinc miscellaneous items (window heat computers, probe heat computers, contactors, relays, miscellaneous equipment, etc...).
There is also a ground power receptacle forward of the nose gear between Frames 7 and 8.
All the rack shelves are removable. An underfuselage access door is provided at Frame 4.
B. Avionics Compartment - Lateral Right Part
This part contains the following items of equipment:
This part contains the following items of equipment:
- Ann Lt Test Unit 70VU, between Frames 10 and 12.
- Relay Box 103VU, between Frames 9 and 10.
- Contactor Box 107VU, between Frames 15 and 16.
- It is also fitted with two batteries, 2 transformer rectifiers, 1 static inverter and 2 battery charge limiters.
C. Avionics Compartment - Lateral Left Part.
This part contains the following items of equipment:
This part contains the following items of equipment:
- AC/DC Emergency Power Center 106VU, between Frames 13 and 15.
- the associated generator control unit, transformer rectifier and transformer.
An underfuselage off-centered door provides external access at Frame 14.
D. Avionics Compartment - Aft Part.
This part contains the following items of equipment:
This part contains the following items of equipment:
- A 30 MCU capacity rack with an adjustable shelf for ADIRS installation, located under the air cooling pack for the ventilated equipment, between Frames 21 and 22.
- Aft Electronics Rack 80VU
Between Frames 23A and 24 there is a 274 MCU capacity transversal rack heaving four levels.
An underfuselage off-centered door provides external access at Frame 22.
An access panel allows communication with the passenger compartment.