What was found
WITH APU RUNNING AND BLEED AIR SELECTED ON, COUPLING FAILED CAUSING DUCT TO SEPARATE. PROBABLE CAUSE UNKNOWN. SUGGEST MORE AGGRESSIVE LOCKING MECHANISM. (K)
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
WITH APU RUNNING AND BLEED AIR SELECTED ON, COUPLING FAILED CAUSING DUCT TO SEPARATE. PROBABLE CAUSE UNKNOWN. SUGGEST MORE AGGRESSIVE LOCKING MECHANISM. (K)