NTSB Identification: CHI85IA166.
The docket is stored on NTSB microfiche number 29677.
Nonscheduled 14 CFR
Incident occurred Wednesday, April 17, 1985 in CHICAGO, IL
Aircraft: de Havilland DH-125, registration: N711WJ
Injuries: 4 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.

ON APRIL 17,1985 AT 1319CST, AT CHICAGO O'HARE INTERNATIONALAIRPORT, A DE HAVILLAND DH-125,N711WJ, REGISTERED TO RYNES AVIATION,INC., AND FLOWN BY ATR RONALD F. RYNES, COLLIDED WITH A FENCE AND A MOVABLE PASSENGER LOADING STAIRS AFTER EXPERIENCING A TOTAL LOSS OF HYDRAULIC PRESSURE WHICH RENDERED THE BRAKES INOPERATIVE. VISUAL METEOROLOGICAL CONDITIONS PREVAILED AT THE TIME OF THE ACCIDENT. THE AIRCRAFT HAD BEEN FILED ON AN IFR FLIGHT PLAN. THE AIRCRAFT RECEIVED MINOR DAMAGE. THERE WERE NO INJURIES TO THE OCCUPANTS. THERE WAS NO FIRE. THE FLIGHT ORIGINATED AT BOCA RATON AIRPOR, FLORIDA AT ABOUT 1130 EST ON APRIL 17,1985. THE AIRCRAFT WAS PREPARING FOR DESCENT INTO CHICAGO FOR A LANDING AT MEIGS FIELD WHEN THE CREW BECAME AWARE OF A TOTAL LOSS OF HYDRAULIC SYSTEM PRESSURE IN THE NORMAL SYSTEM. THEY MADE A DECISION TO LAND AT O'HARE AIRPORT DUE TO THE BETTER RUNWAYS AND AVAILABILITY OF GREATER CRASH FIRE RESCUE CAPABILITY.

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

HYDRAULIC SYSTEM..LOSS,TOTAL

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

JUDGMENT..POOR..PILOT IN COMMAND


Contributing Factors

LANDING GEAR,NORMAL BRAKE SYSTEM..FAILURE,TOTAL


Contributing Factors

IN-FLIGHT PLANNING/DECISION..PERFORMED..PILOT IN COMMAND


Contributing Factors

HYDRAULIC SYSTEM,LINE..CHAFED

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