# NTSB DEN84FA290: Bell 206L-3, N99TV, Denver, CO, September 13, 1984

- Type: NTSB accident investigation
- Classification: Accident · Serious injuries · Field investigation · Final report
- Date: September 13, 1984, 06:58 local (12:58 UTC)
- Place: Denver, CO
- Coordinates: 39.729831, -105.01966 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=39.7298&lon=-105.0197&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: Serious injuries
- Injuries: 2 serious, 1 minor
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 16239
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN84FA290
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/16239/pdf
- Page: https://openairdocs.org/ntsb/DEN84FA290

## Sequence of events

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

- Loss of engine power(total) - mech failure/malf, maneuvering
  - fuel system,fuel control - fatigue (cause)
  - maintenance,installation - improper, other maintenance personnel (cause)
  - fuel system,fuel control - failure,total
  - fluid,fuel - starvation
- Forced landing, descent - emergency
  - altitude - inadequate (contributing factor)
  - emergency procedure - attempted, pilot in command
- Hard landing, landing

## Analysis

PLT HAD SLOWED THE HELICOPTER TO 30 KIAS USING 50 TO 60% PWR AT AN ALT OF 700 FT AGL. PLT THE HEARD 'TWO BEEPS' FROM THE ENG OUT WARNING HORN, SAW ENG OUT ANNUNCIATOR LIGHTS ILLUMINATE & THE 'TURBINE NEDDLE DROPPING.' PLT 'BOTTOMED'THE COLLECTIVE, LOWERING THE NOSE, BUT HELICOPTER DESCENDED WHILE YAWING LEFT AND RIGHT UNTIL CONTACTING A CREEK BED. INSPECTION OF THE ACFT REVEALED THE PC LINE WAS BROKEN HUST PAST THE 90 DEG BEND WHERE IT CONNECTS TO THE GAS PRODUCER FUEL CONTROL. THE OTHER END OF THE BREAK WAS CONCEALED BY A B-NUT. METALLURGICAL TESTING REVEALED THE LINE FAILED DUE TO FATIGUE. AREAS OF FRETTING AND DIMPLING WERE FOUND ON THE LINE. THE ENGINE IN N99TV WAS REMOVED FROM THE ACFT ON 11/14/83 AND AGAIN ON 9/6/84. EACH REMOVAL NECESSITATED UNFASTENING AND FASTENING OF THE PC LINE.

## Aircraft

- Registration: [N99TV](https://openairdocs.org/deregistered/N99TV-1989-04-04), registration cancelled 1989-04-04, S/N 51116 (OpenAirDocs)
- Reported make and model: BELL 206L-3
- Registry model: [Bell 206L-3](https://openairdocs.org/model/bell-206l-3) (registry code 1182108) (OpenAirDocs)
- Category: Helicopter
- Serial number: 51079
- Airframe hours: 2738
- Engines: ALLISON 250-C30P 435 horsepower turbo shaft
- Damage: Destroyed
- Flight: Business, Part 91
- Registered owner: Kbtv Broadcasting, Inc.
- Airworthiness certificate: Standard, Normal
- Last inspection: 100 hour, August 16, 1984, 685 hours before
- Departed: DEN, DENVER, CO

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 48; airline transport, commercial; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 1, valid medical--w/ waivers/lim; seat: right; flight hours: 7,818 total, 7,518 as pilot in command, 15 in the last 90 days, 14 in the last 30 days, 5 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 160° at 3 knots
- Visibility: 50 statute miles
- Lowest ceiling: 9,500 ft broken
- Temperature: 57 °F, dew point 48 °F
- Altimeter: 30.00 inHg
- Observed at: DEN, 7 nm away

## 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 19840913054899A](https://openairdocs.org/incident/19840913054899A), Sep 13, 1984: Bell 206L3, Denver, CO, Substantial damage. Power loss, landed in cherry creek viaduct, downtown Denver. Fuel control pc line broken, previously misinstalled.

## Other investigations on N99TV (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 DEN89FA019](https://openairdocs.org/ntsb/DEN89FA019), Oct 19, 1988: Bell 206L-3 (N99TV), Deckers, CO, destroyed, 2 fatal

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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