# NTSB CHI85IA166: de Havilland DH-125, N711WJ, Chicago, IL, April 17, 1985

- Type: NTSB incident investigation
- Classification: Incident · No injuries · Incident investigation · Final report
- Date: April 17, 1985, 13:19 local (19:19 UTC)
- Place: Chicago, IL
- Location: 41.8500° N, 87.6501° W: Placed by OpenAirDocs: center of Chicago, IL, within about 9 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=41.8500&lon=-87.6501&mi=10
- Highest injury: No injuries
- Injuries: 4 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 12916
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI85IA166
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/12916/pdf
- Page: https://openairdocs.org/ntsb/CHI85IA166

## Sequence of events

In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf).

- Occurrence
  - hydraulic system - loss,total (cause)
  - in-flight planning/decision - performed, pilot in command (contributing factor)
- On ground/water collision with object, taxi - from landing
  - landing gear,normal brake system - failure,total (contributing factor)
  - judgment - poor, pilot in command (cause)
  - hydraulic system,line - chafed (contributing factor)

## Analysis

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.

## Aircraft

- Registration: N711WJ (not matched to a registry record)
- Reported make and model: de Havilland DH-125
- Category: Airplane
- Serial number: 25021
- Airframe hours: 6710
- Engines: BRISTSIDVIPER 522 3360 lbs thrust turbo jet
- Damage: Minor damage
- Flight: Part 135
- Operator: Ronald F. Rynes, doing business as Rynes Aviation,Inc.
- Airworthiness certificate: Standard, Transport
- Departed: BCT, BOCA RATON, FL
- Destination: CGX, CHICAGO, IL
- Flight plan: IFR

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 55; airline transport; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: unknown, unknown; seat: left; flight hours: 8,000 total, 2,000 in this make and model

## Weather

- Conditions: Visual (VMC), Day
- Wind: 190° at 16 knots
- Visibility: 15 statute miles
- Lowest ceiling: none
- Temperature: 64 °F, dew point 45 °F
- Altimeter: 30.00 inHg
- Observed at: ORD

## FAA reports on this event (1)

The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs).

- [Incident 19850417075759I](https://openairdocs.org/incident/19850417075759I), Apr 17, 1985: Hwksly DH1251A, Chicago, IL, Minor damage. Diverted to Ohare,hydraulic pressure loss. Lost brakes taxiing, hit fence and movable stairs. Hydraulic line burst.

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

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