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NTSB Report
July 15, 1992 · Boeing 737-222 · N12235
Oklahoma City, OK
Overview
Report Status
Probable Cause
Event Type
Incident
Date
July 15, 1992
Injury Outcomes
No injuries (88 uninjured)
Location
Oklahoma City, OK
Aircraft
Boeing 737-222
Tail Number
N12235
Operator
Continental Airlines
Injuries
None
NTSB Number
FTW92IA184
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.
NTSB Probable Cause
HYDRAULIC FLUID EXHAUSTION DUE TO THE CHAFED 'A' SYSTEM HYDRAULIC LINE AND THE IMPROPER INSTALLATION BY UNKNOWN MAINTENANCE PERSONNEL OF THE 'B' SYSTEM LINE.
Full Narrative
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.
Flight
Event TypeIncident
Event Time16:15 CDT
Nearest Airport0nm N
Runway0
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBoeing 737-222
Tail NumberN12235
Aircraft CategoryAir
OperatorContinental Airlines
Operating RulePart 121
Engines2
Engine TypeTurbofan
Engine DetailsP&W · JT8D-9 · Turbofan · 14500
Seats107
People & Injuries
Injury SummaryNo injuries (88 uninjured)
Fatal0
Serious0
Minor0
Uninjured88
Total88
Crew 1Age 44 · First Class
Conditions
ConditionsVMC
LightDaylight
WindCalm
Visibility10 sm
CeilingNone
Temperature / Dew Point0 C / 0 C
Altimeter0
Weather SourcePILO