NTSB Identification: FTW92IA184.
The docket is stored on NTSB microfiche number 47342.
Scheduled 14 CFR operation of CONTINENTAL AIRLINES, INC.
Incident occurred Wednesday, July 15, 1992 in OKLAHOMA CITY, OK
Probable Cause Approval Date: 06/30/1993
Aircraft: BOEING 737-222, registration: N12235
Injuries: 88 Uninjured.

NTSB investigators used data provided by various sources and may not have traveled in support of this investigation to prepare this aircraft incident report.

THE AIRPLANE EXPERIENCED A DUAL HYDRAULIC SYSTEM FAILURE DURING FINAL APPROACH. THE CAPTAIN ELECTED TO GO AROUND AND LAND AT A NEARBY MILITARY AIRPORT THAT HAD LONGER RUNWAYS. THE LANDING WAS UNEVENTFUL. INVESTIGATION REVEALED THAT A HOLE HAD BEEN CHAFED THROUGH A RETURN LINE IN THE 'A' HYDRAULIC SYSTEM AT A BRACKET IN THE LEFT WHEEL WELL AREA. IT WAS ALSO DETERMINED THAT AN 'A' SYSTEM AND A 'B' SYSTEM RETURN LINE HAD BEEN CROSS CONNECTED IN THE AREA OF THE NO. 1 PYLON. THE CROSS CONNECTED LINES ALLOWED THE 'B' SYSTEM FLUID TO TRANSFER INTO THE 'A' SYSTEM AND VENT OVERBOARD. BOTH HYDRAULIC SYSTEMS, INDICATIONS AND READINGS, AND TESTS WERE NORMAL UNTIL THE HOLE WAS CHAFED THROUGH THE 'A' SYSTEM LINE. A MAINTENANCE RECORD REVIEW COULD NOT DETERMINE AT WHAT POINT IN TIME THE LINES HAD BEEN REVERSED.

The National Transportation Safety Board determines the probable cause(s) of this incident to be:

HYDRAULIC FLUID EXHAUSTION DUE TO THE CHAFED 'A' SYSTEM HYDRAULIC LINE AND THE IMPROPER INSTALLATION BY UNKNOWN MAINTENANCE PERSONNEL OF THE 'B' SYSTEM LINE.

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