DOC AIRBUS | AMM A320FHarness General [CFML]
TASK 70-71-31-910-801-A
Harness General
1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Referenced Information
3. Job Set-up
Subtask 70-71-31-860-050-A
Subtask 70-71-31-910-050-A
[Rev.10 from 2021]
2026.04.01 12:54:28 UTC
Harness General
1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
Harness ConstructionSubtask 70-71-31-860-050-A
A. Not Applicable
4. ProcedureSubtask 70-71-31-910-050-A
A. Introduction:
(1) The engine harnesses interconnect the airframe with the electrical components mounted on the engine. These harnesses provide electrical power to the various components. They also provide circuits for the transmission of signals for engine monitoring functions.
(2) Some of the harnesses are named for engine functions and others are named for the engine or thrust reverser to which they apply.
(3) New generation computer controlled engines and increased use of composite materials significantly impacted the make of the electrical harnesses built by Rohr Inc. for the various Nacelle systems.
(4) The more severe requirements for today's harnesses require:
Subtask 70-71-31-910-051-A (1) The engine harnesses interconnect the airframe with the electrical components mounted on the engine. These harnesses provide electrical power to the various components. They also provide circuits for the transmission of signals for engine monitoring functions.
(2) Some of the harnesses are named for engine functions and others are named for the engine or thrust reverser to which they apply.
(3) New generation computer controlled engines and increased use of composite materials significantly impacted the make of the electrical harnesses built by Rohr Inc. for the various Nacelle systems.
(4) The more severe requirements for today's harnesses require:
- A high degree of extremely reliable lightning and Electromagnetic Interference (EMI) protection,
- Operation in sustained higher temperature environments,
- Line replacement and connector replacement capability.
B. Harness Construction:
(1) The electrical harnesses have wires with one, two, or three conductors which are shielded. The wire shields are grounded by being attached to the connector backshell. The wires are then covered with a metal shield.
(2) The metal overbraid prevents the wires from lightning hits:
(5) Each connector on the harness is identified with a Functional Identification Number (FIN). The FIN is on an identification sleeve which is located near the connector.
(6) The harness also has an identification sleeve. The harness identification includes the harness part number and the harness FIN number.
(1) The electrical harnesses have wires with one, two, or three conductors which are shielded. The wire shields are grounded by being attached to the connector backshell. The wires are then covered with a metal shield.
(2) The metal overbraid prevents the wires from lightning hits:
- The metal overbraid is put on the harness by a machine,
- The overbraid is made of nickel plated copper,
- The overbraid is attached to the connector adapter by a tie-dex band.
- The backshell adapters provide a metal surface for the ground of the wire shields and the metal overbraid,
- The backshell attaches to the connector,
- The connector is attached to the equipment,
- The equipment is grounded by touching the aircraft structure or by bonding straps.
(5) Each connector on the harness is identified with a Functional Identification Number (FIN). The FIN is on an identification sleeve which is located near the connector.
(6) The harness also has an identification sleeve. The harness identification includes the harness part number and the harness FIN number.