The leak detection system is used to detect leaks in the vicinity of the packs, wings, pylons and APU hot air ducts.
There are two independent loops as redundancy in both pylons and both wing sides.
The APU hot air duct is monitored by a single loop.
NOTE: Each loop consists of sensing elements connected in series.
Both extremities of the overheat detection loop are connected to the BMC.
For CFM LEAP only, the Engine Nacelle Core Temperature sensor measures the temperature within the core cowling near the ECS ducting.
This signal is used to indicate an under cowl leak (overheat and/or burst duct events).
Author – Zinhom Mahmoud
Aviation Training Consultant at EgyptAir