What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-23) At flight level 310, enroute from houston (iah) to elko (eko), the hydraulic quantity gage dropped from 2 gallons to 1 gallon indicated. The hydraulic "a" system pumps were turned off. Quantity continued to drop to zero and within 5 minutes the "b" system failed. Both "a" and "b" system pressure gages were observed dropping to zero simultaneously. An emergency was declared and the aircraft diverted into Salt Lake City (slc). Maintenance found a hole chaffed through a hydraulic hard line near the #1 engine. Both hydaulic pumps were changed due to an open circuit on the #1 pump solenoid which allowed the pumps to run dry. Also, the pressure regulator in the hydraulic reservoir was replaced which allowed the "b" system to deplete.
As the FAA filed it
(-23) AT FLIGHT LEVEL 310, ENROUTE FROM HOUSTON (IAH) TO ELKO (EKO), THE HYDRAULIC QUANTITY GAGE DROPPED FROM 2 GALLONS TO 1 GALLON INDICATED. THE HYDRAULIC "A" SYSTEM PUMPS WERE TURNED OFF. QUANTITY CONTINUED TO DROP TO ZERO AND WITHIN 5 MINUTES THE "B" SYSTEM FAILED. BOTH "A" AND "B" SYSTEM PRESSURE GAGES WERE OBSERVED DROPPING TO ZERO SIMULTANEOUSLY. AN EMERGENCY WAS DECLARED AND THE AIRCRAFT DIVERTED INTO SALT LAKE CITY (SLC). MAINTENANCE FOUND A HOLE CHAFFED THROUGH A HYDRAULIC HARD LINE NEAR THE #1 ENGINE. BOTH HYDAULIC PUMPS WERE CHANGED DUE TO AN OPEN CIRCUIT ON THE #1 PUMP SOLENOID WHICH ALLOWED THE PUMPS TO RUN DRY. ALSO, THE PRESSURE REGULATOR IN THE HYDRAULIC RESERVOIR WAS REPLACED WHICH ALLOWED THE "B" SYSTEM TO DEPLETE.
Other reports on N457TM · 3
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