# NTSB CHI84IA294: Enstrom F-28A, N13CM, Muncie, IN, July 3, 1984

- Type: NTSB incident investigation
- Classification: Incident · No injuries · Incident investigation · Final report
- Date: July 3, 1984, 12:30 local (16:30 UTC)
- Place: Muncie, IN
- Coordinates: 40.130004, -85.380905 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=40.1300&lon=-85.3809&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 12455
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI84IA294
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/12455/pdf
- Page: https://openairdocs.org/ntsb/CHI84IA294

## Sequence of events

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

- Airframe/component/system failure/malfunction, maneuvering
  - rotor drive system,tail rotor drive shaft - failure,total (cause)
- Forced landing, landing
  - autorotation - performed, pilot in command

## Analysis

ACCORDING TO THE PLT, HE WAS IN A 20 DEG LEFT BANK WITH AN AIRSPEED OF ABOUT 40 KTS WHEN THE HELICOPTER BEGAN ROTATION TO THE RIGHT. HE ENTERED AN AUTOROTATION & LANDED WITH A FORWARD SPEED OF ABOUT 5 KTS. AN EXAM REVEALED THAT THE TAIL ROTOR DRIVE SHAFT HAD FAILED. THE DRIVE SHAFT HAD ABOUT 1314 FLT HRS OF OPERATION.

## Aircraft

- Registration: [N13CM](https://openairdocs.org/aircraft/N13CM), registered now, S/N 090, built 1972 (OpenAirDocs)
- Reported make and model: ENSTROM F-28A
- Registry model: [Enstrom F-28A](https://openairdocs.org/model/enstrom-f-28a) (registry code 3300406) (OpenAirDocs)
- Registry engine: [Lycoming I0360 series](https://openairdocs.org/engine/lycoming-i0360-series) (registry code 41515, reciprocating) (OpenAirDocs)
- Category: Helicopter
- Serial number: 090
- Airframe hours: 1314
- Engines: LYCOMING HIO-360-C1B 205 horsepower reciprocating
- Damage: Minor damage
- Flight: Business, Part 91
- Registered owner: Olympian Aviation, Inc.
- Airworthiness certificate: Standard, Normal
- Departed: IND, INDIANAPOLIS, IN
- Airport: MIE, Delaware Co.

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 39; commercial; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 1, valid medical--no waivers/lim.; seat: left; flight hours: 10,077 total, 75 in this make and model, 9,525 as pilot in command, 50 in the last 90 days

## Weather

- Conditions: Visual (VMC), Day
- Wind: 210° at 15 knots
- Visibility: 4 statute miles
- Lowest ceiling: 5,000 ft broken
- Altimeter: 30.00 inHg
- Observed at: MIE

## Other investigations on N13CM (2)

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 BFO94LA137](https://openairdocs.org/ntsb/BFO94LA137), Aug 16, 1994: Enstrom F-28A (N13CM), Stewartsville, NJ, substantial damage. Probable cause: THE LOSS OF ENGINE POWER FOR UNDETERMINED REASON.
- [NTSB MKC87LA102](https://openairdocs.org/ntsb/MKC87LA102), May 7, 1987: Enstrom F-28A (N13CM), Fayetteville, AR, substantial damage

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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