A leak has been sensed in the bleed air ducts downstream of the right flow control valve, up the precooler crossover valve and up the trim air check valve.
A leak detection sensor along the ducts for the wing anti-ice system has sensed a leak.
A failure (open or short circuit) has been detected in the bleed leak detection system. This is only checked during the power-up self-test.
The two bleed leak detection loops in the pack inlet ducts have failed during the power-up self test.
A failure (open or short circuit) has been detected in the bleed leak detection system. This is only checked during the power-up self-test.
The bleed leak detection loops around the trim air ducts have failed. This is only checked during power-up self-test.
A fault has been sensed in the bleed leak detection loop system and redundancy is lost.
Left bleed pressure sensor supplies no signal/out of range signal to the IAS controller, or the left flow control valve is indicating not full closed/full closed and the L BLEED FAIL advisory message is not shown, or the IAS controller has failures.
The two bleed leak detection loops in the right pylon have failed during the power-up self-test.
Right bleed pressure sensor supplies no signal/out of range signal to the IAS controller, or the right flow control valve is indicating not full closed/full closed and the R BLEED FAIL advisory message is not shown, or the IAS controller has failures.
The two bleed leak detection loops in the right pylon have failed during the power-up self-test.
The WING A/ICE LOOP FAIL advisory message is posted by either IASC 1B or IASC 2B when both loops of the wing anti-ice ducting are detected failed. (shorted or open). The two wing anti-ice lead detection loops have failed.