Leak detection apparatus for aircraft bleed air systems

For use in an aircraft bleed air system having an inner bleed air duct surrounded by a gas impervious shroud defining a space therebetween, a bleed air leak detection system comprising:

• a space supported upon a bleed air duct and having an outer support surface within the shroud;
• a sleeve received upon a shroud overlying said outer support surface and captivating a portion of the shroud between said sleeve and said outer surface;
• a plenum having a plenum space therein and a pair of elongated hollow sensor tubes each defining a sensor tube plenum in communication with said plenum space;
• a pair of sensor wire sets passing through said sensor tube plenums;
• and
• a bleed air leakage director and accumulation coupled to said plenum space and the shroud space having means for directing bleed air leakage into said plenum space and said sensor tubes unto said sensor wire sets.