# NTSB ATL82DA027: Bell 206L-1, N5745Y, Chamblee, GA, January 2, 1982

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Final report
- Date: January 2, 1982, 18:37 local (23:37 UTC)
- Place: Chamblee, GA
- Coordinates: 33.900394, -84.300956 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=33.9004&lon=-84.3010&mi=10
- Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report January 2, 1983
- Report: Approved by Office Director
- NTSB case key (mKey): 70181
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ATL82DA027
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/70181/pdf
- Page: https://openairdocs.org/ntsb/ATL82DA027

## Sequence of events

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

- Loss of engine power(partial) - mech failure/malf, approach - vfr pattern - final approach
  - fuel system,fuel control - erratic (contributing factor)
  - maintenance,service bulletin/letter - not received, company maintenance personnel (cause)
  - acft/equip,inadequate aircraft component, manufacturer (contributing factor)
- Forced landing, approach - vfr pattern - final approach
  - autorotation - initiated, pilot in command
- Hard landing, landing - flare/touchdown
  - light condition - dark night (contributing factor)

## Analysis

WHILE RETURNING TO REFUEL FROM AN AIR AMBULANCE FLIGHT THE HELICOPTER YAWED LEFT AND N2 DROPPED TO ABOUT 92% APPROXIMATELY ONE MILE FROM THE AIRPORT. AT 30-50 FEET WITH AIRSPEED AT ABOUT 20 KNOTS THE AIRCRAFT YAWED VIOLENTLY TO THE LEFT WITH CORRESPONDING DROPS IN N2 TO 55-60% THEN SURGED BACK TO 102-105%. THE PILOT ENTERED AUTOROTATION AND TOUCHED DOWN HARD 300 YARDS SHORT OF HIS INTENDED LANDING POINT. DETROIT DIESEL ALLISON COMMERCIAL ENGINE BULLETIN(CEB) A-73-2020 DATED 9/7/81 & REVISED 10/5/81 ADVOCATES DISARMING THE N2(ELECTRONIC) OVERSPEED CONTROL SYSTEM BECAUSE OF REPORTED INTERMITTENT AND SPURIOUS ACTIVATION OF THAT SYSTEM. THE SYSTEM WAS ONLY PARTIALLY DEACTIVATED IN COMPLIANCE WITH BELL ALERT SERVICE BULLETIN(ASB) 206L-81-24 DATED 9/11/81 DUE TO THE OPERATOR'S MAINTENANCE PERSONNEL REPORTING THAT THEY HAD NOT RECEIVED THE REFERENCED CEB AS OF THE DATE OF THE ACCIDENT.

## Aircraft

- Registration: [N5745Y](https://openairdocs.org/aircraft/N5745Y), registered now, S/N 45531, built 1980 (OpenAirDocs)
- Reported make and model: BELL 206L-1
- Registry model: [Bell Helicopter Textron 206L-1](https://openairdocs.org/model/bell-helicopter-textron-206l-1) (registry code 1182107) (OpenAirDocs)
- Registry engine: [Allison 250 SER 250HP](https://openairdocs.org/engine/allison-250-ser-250hp) (registry code 03002, turbo-shaft) (OpenAirDocs)
- Category: Helicopter
- Serial number: 45531
- Airframe hours: 641
- Engines: ALLISON 250-C28B 435 horsepower turbo shaft
- Damage: Substantial damage
- Flight: Part 135
- Operator: Rocky Mountain Helicopters, In
- Registered owner: Rocky Mountain Helicopters, In
- Departed: DECATUR, GA
- Destination: LYDIA, SC
- Airport: PDK, runway 34, 5,001 × 100 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 37; commercial; instrument ratings: helicopter; medical: class 2, valid medical--no waivers/lim.; flight hours: 5,060 total, 326 in this make and model, 75 in the last 90 days, 4 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Night/dark
- Wind: 90° at 10 knots
- Visibility: 10 statute miles
- Temperature: 120 °F
- Altimeter: 30.00 inHg
- Observed at: PDK

## FAA reports on this event (1)

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

- [Accident 19820102000149A](https://openairdocs.org/incident/19820102000149A), Jan 2, 1982: Bell 206L1, Chamblee, GA, Substantial damage. Helicopter encountered downdraft during landing approach and touched down hard short of intended landing spot.

## Other investigations on N5745Y (1)

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.

- [NTSB WPR12LA408](https://openairdocs.org/ntsb/WPR12LA408), Sep 9, 2012: Bell Helicopter Textron 206L-1 (N5745Y), Grand Canyon, AZ, substantial damage. Probable cause: A total loss of engine power during descent for reasons that could not be determined because postaccident engine examinations and testing revealed no evidence of an anomaly that would have precluded…

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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