- Date
- July 15, 1992, 16:15 local (21:15 UTC)
- Place
- Oklahoma City, OK
- Injuries
- 88 uninjured
- Damage
- No damage
- Phase of flight
- Approach
- Aircraft
- N12235Boeing 737-222
- Weather
- Visual (VMC) · Day
- Status
- Completed · report June 30, 1993
- Report
- Approved by Office Director
- Case key
- 18391
From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the incident.
On this page
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.
Sequence of events
NTSB’s coding before 2008: each occurrence and phase of flight, and the causes and factors under it. The codes are defined in NTSB’s coding manual.
Analysis
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.
Aircraft
- Registration
- N12235
- Reported as
- Boeing 737-222
- Category
- Airplane
- Serial number
- 19758
- Airframe hours
- 41,106
- Engine
- P&W JT8D-9, 14,500 lbs thrust, turbo fan
- Damage
- No damage
- Flight
- Part 121
- Operator
- Continental Airlines, Inc.
- Registered owner
- Icci, Inc.
- Airworthiness certificate
- Standard, Transport
- Last inspection
- Continuous airworthiness · February 3, 1992 · 74 hours before
- Departed
- DEN · Denver, CO
- Flight plan
- IFR
Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.
Flight crew
As NTSB recorded them. NTSB leaves out names.
- Role
- Pilot
- Age
- 44
- Certificate
- Airline transport
- Airplane ratings
- Single-engine land, Multi-engine land
- Instrument ratings
- Airplane
- Medical
- Class 1, Valid Medical--no waivers/lim.
- Seat
- Left
- Flight hours
- 13,000 total · 800 in this make and model · 120 in the last 90 days · 40 in the last 30 days · 2 in the last 24 hours
Weather
- Conditions
- Visual (VMC) · Day
- Visibility
- 10 statute miles
- Lowest ceiling
- None