NTSB Identification: FTW88DRD16.
The docket is stored on NTSB microfiche number 36593.
Accident occurred Sunday, July 24, 1988 in BASTROP, LA
Probable Cause Approval Date: 07/26/1989
Aircraft: PZL-Mielec M18, registration: N46831
Injuries: 1 Uninjured.

THIS AG AIRPLANE HAS A HYDRAULIC SYSTEM THAT OPERATES THE BRAKES AND FLAPS. THE ENGINE DRIVEN HYDRAULIC PUMP PROVIDES PRESSURE TO THE PRIMARY SYSTEM FOR NORMAL USE AND ALSO PROVIDES PRESSURE TO AN ACCUMULATOR FOR EMERGENCY USE. THE PRESSURE IN THE ACCUMULATOR CAN PROVIDE PRESSURE FOR SEVERAL FLAP MOVEMENTS PLUS SUFFICIENT EXTRA FOR BRAKE USE. THE PRIMARY SYSTEM AND ACCUMULATOR SYSTEM BOTH HAVE PRESSURE GAUGES. THE PILOT SAW THE PRESSURE DROP ON THE GAUGE AND FLEW TO A SATISFACTORY STRIP AND LANDED. AFTER TOUCHDOWN, THE PILOT SHUTDOWN THE ENGINE. ACFT TRACKED TO RIGHT, CROSSED A LEVEE AND WENT INTO A DRAINAGE DITCH. EXAM OF HYDRAULIC SYSTEM REVEALED A LEAKING SEAL.

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

HYDRAULIC SYSTEM,SEAL..FAILURE,PARTIAL

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

LANDING GEAR,NORMAL BRAKE SYSTEM..INOPERATIVE

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

LANDING GEAR,EMERGENCY BRAKE SYSTEM..INOPERATIVE

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

HYDRAULIC SYSTEM,RESERVOIR..PRESSURE TOO LOW


Contributing Factors

TERRAIN CONDITION..DIRT BANK/RISING EMBANKMENT

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