TRAINING MANUAL CFM56-5B ENGINE SYSTEMS 培训手册 CFM56-5B 发动机系统(23)

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They are all screened against high frequency electrical interferences, and each individual cable within a harness is screened against low frequency electrical interferences.
They are also constructed with fireproof materials and sealed to avoid any fluid penetration.

EFG

HARNESSES INTERFACES
CTC-201-063-01
EFFECTIVITY
73-21-50 Page 5
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03

CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL

EFG
ENGINE WIRING HARNESSES
Fan section wiring harnesses.
The low temperature wiring harness consists of screened and sealed cables with several cores.
The cores are enclosed in a polyamide braid for isolation and protection against shielding braid rubbing.
High frequency shielding is provided by a tinned copper braid surrounded by a heat-shrink sleeve. This sleeve protects the copper braid and ensures wire sealing.
In the engine fan section, stainless steel, fluid-proof connectors are used.
There are two types of connectors, depending on the number of wires the harness contains.
If there is a single wire, the high frequency shielding braid is clamped directly on the connector adaptor.
If there are several wires, the high frequency shielding braids are first crimped together with a main high frequency braid and then, clamped on the connector adaptor.
The adaptor is bolted on the electrical plug, and the junction is protected by a heat-shrink sleeve, glued and clamped on the connector adaptor.
A filling port allows the injection of a sealing compound inside the connector sleeve.
The junctions between the harnesses are protected with heat-shrink sleeves.
The connectors are identified by ring-sleeves that have the connection printed on them.

EFG

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CTC-201-065-01
EFFECTIVITY
73-21-50 Page 7
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03

CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL

EFG
ENGINE WIRING HARNESSES
High temperature wiring harnesses
The high temperature wiring harness consists of screened and sealed cables, with several cores.
The cores are enclosed in a convoluted teflon conduit, for isolation and protection against shielding braid rubbing.
High frequency shielding is provided by a stainless steel braid.
The steel braid is surrounded by a polyamide braid, which is coated with Viton for protection against the barbs of the steel braid.
The polyamide braid is not used when the harness runs close to a very hot part of the engine (e.g. Combustion chamber).
On these harnesses, the connector adaptor has two clamping lands.
The external polyamide braid and the teflon conduit are clamped on the first land and the stainless steel shielding braid is clamped on the second.
　
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