# NTSB ATL85IA005: Bell 206B, N2756F, Chamblee, GA, October 10, 1984

- Type: NTSB incident investigation
- Classification: Incident · No injuries · Incident investigation · Final report
- Date: October 10, 1984, 12:00 local (16:00 UTC)
- Place: Chamblee, GA
- Coordinates: 33.9006, -84.300575 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=33.9006&lon=-84.3006&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 6672
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ATL85IA005
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/6672/pdf
- Page: https://openairdocs.org/ntsb/ATL85IA005

## Sequence of events

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

- Airframe/component/system failure/malfunction, cruise - normal
  - rotorcraft flight control,collective control - undetermined (cause)
  - rotorcraft flight control,collective control - locked
- Forced landing, landing

## Analysis

THE PLT ATTEMPED A DESCENT AND NOTICED THE COLLECTIVE HAD LOCKED UP. EVEN WITH CONSIDERABLE PRESSURE, HE WAS UNABLE TO MOVE THE COLLECTIVE IN EITHER DIRECTION. HE CHECKED THE SYSTEM & MADE SEVERAL REMEDIAL ACTION ATTEMPTS TO NO AVAIL. AN UNEVENTFUL EMERG LANDING WAS PERFORMED. A COMPLETE EXAMINATION OF THE COLLECTIVE HYDRAULIC SYSTEM FAILED TO DISCLOSE ANY SYSTEM FAILURE.

## Aircraft

- Registration: N2756F (not matched to a registry record)
- Reported make and model: BELL 206B
- Category: Helicopter
- Serial number: 2696
- Airframe hours: 2117
- Engines: ALLISON 250-C20B 317 horsepower turbo shaft
- Damage: No damage
- Flight: Part 135
- Operator: Dooley Helicopter Inc.
- Registered owner: Revco Helicopter Inc.
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, May 29, 1984, 28 hours before
- Departed: HIGHLANDS, NC
- Destination: CHAMBLEE, GA
- Flight plan: VFR
- Airport: PDK, Dekalb/Peachtree, runway 16, 3,996 ×  ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 30; commercial; airplane ratings: multi-engine land, single-engine land; instrument ratings: helicopter; medical: class 1, valid medical--no waivers/lim.; seat: left; flight hours: 7,903 total, 5,602 in this make and model

## Weather

- Conditions: Visual (VMC), Day
- Wind: 130° at 6 knots
- Visibility: 11 statute miles
- Lowest ceiling: none
- Temperature: 75 °F, dew point 61 °F
- Altimeter: 30.00 inHg
- Observed at: 3

## 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 19841010072399I](https://openairdocs.org/incident/19841010072399I), Oct 10, 1984: Bell 206B, Chanblee, GA. During level flight collective would not move either direction. Uneventful landing made. Cause undetermined.

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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