# NTSB CHI84IA224: Beech 99, N320BA, Chicago, IL, June 9, 1984

- Type: NTSB incident investigation
- Classification: Incident · Minor injuries · Incident investigation · Final report
- Date: June 9, 1984, 09:26 local (14:26 UTC)
- Place: Chicago, IL
- Location: 41.9769° N, 87.9081° W: Placed by OpenAirDocs at CHICAGO O'HARE INTL (ORD), within about a mile (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=41.9769&lon=-87.9081&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 1 minor, 10 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 12451
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI84IA224
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/12451/pdf
- Page: https://openairdocs.org/ntsb/CHI84IA224

## Sequence of events

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

- Gear collapsed, landing
  - hydraulic system - fatigue (cause)
  - gear down and locked - not possible, pilot in command

## Analysis

LANDING GEAR EXTENDED BUT NOT LOCKED. CREW COULD NOT RECTIFY SITUATION BY USING NORMAL AND EMERGENCY GEAR EXTENSION PROCEDURES. GEAR COLLAPSED ON TOUCHDOWN. INVESTIGATION DISCLOSED A FATIGUE CRACK IN RT MAIN GEAR HYDRAULIC ACTUATOR ALLOWING A LOSS OF HYDRAULIC FLUID. MAINTENANCE RECORDS PROVIDED BY THE OPERATOR INDICATE THE ACTUATORS WERE CHECKED FOR LEAKS AND ALIGNMENT 28 HRS PRIOR TO THIS INCIDENT.

## Aircraft

- Registration: [N320BA](https://openairdocs.org/deregistered/N320BA-1989-02-11), registration cancelled 1989-02-11, S/N U56 (OpenAirDocs)
- Reported make and model: BEECH 99
- Registry model: [Beech 99](https://openairdocs.org/model/beech-99) (registry code 1154002) (OpenAirDocs)
- Category: Airplane
- Serial number: U56
- Airframe hours: 29000
- Engines: P&W PT6A-20 550 horsepower turbo prop
- Damage: Minor damage
- Flight: Part 135
- Registered owner: Britt Airways, Inc.
- Airworthiness certificate: Standard, Normal
- Last inspection: Continuous airworthiness, June 5, 1984, 28 hours before
- Departed: BMG, BLOOMINGTON, IN
- Destination: ORD, CHICAGO, IL
- Flight plan: IFR
- Airport: ORD, O'Hare, runway 14, 11,600 × 200 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 41; airline transport; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 1, valid medical--w/ waivers/lim; seat: left

## Weather

- Conditions: Visual (VMC), Day
- Wind: 220° at 5 knots
- Visibility: 4 statute miles
- Lowest ceiling: 4,600 ft broken
- Temperature: 72 °F, dew point 68 °F
- Altimeter: 29.00 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 19840609038539I](https://openairdocs.org/incident/19840609038539I), Jun 9, 1984: Beech 99, Chicago, IL, Minor damage. Unable to obtain safe gear down indication. The gear collapsed on landing. Cracked hydraulic actuator.

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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