# NTSB FTW88LA152: Brantly Helicopter B-2B, N2264U, Sallisaw, OK, August 25, 1988

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: August 25, 1988, 12:10 local (17:10 UTC)
- Place: Sallisaw, OK
- Coordinates: 35.460304, -94.800491 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=35.4603&lon=-94.8005&mi=10
- Phase of flight: [Taxi](https://openairdocs.org/ntsb-phases/250) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report January 24, 1990
- Report: Approved by Office Director
- NTSB case key (mKey): 22675
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW88LA152
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/22675/pdf
- Page: https://openairdocs.org/ntsb/FTW88LA152

## Sequence of events

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

- Airframe/component/system failure/malfunction, taxi - aerial
  - rotor drive system,tail rotor drive shaft coupling - failure,total (cause)
  - maintenance,inspection - inadequate, other maintenance personnel (cause)
  - rotor drive system,tail rotor drive shaft - disconnected (cause)
- Forced landing, descent - emergency
- Hard landing, landing - flare/touchdown
  - terrain condition - ditch (contributing factor)
  - emergency procedure - delayed, pilot in command (contributing factor)
- Roll over, landing - flare/touchdown

## Analysis

ACFT EXPERIENCED A HARD LANDING AND ROLLED OVER FOLLOWING A LOSS OF CONTROL IN A HOVER. PLT DELAYED CUTTING THE THROTTLE IN ORDER TO CLEAR A DITCH. INVESTIGATION REVEALED THAT THE TAIL ROTOR DRIVESHAFT COUPLING RETAINING SCREW HAD SEPARATED. THE SEPARATION ALLOWED A DISCONNECT IN THE TAIL ROTOR DRIVESHAFT AND LOSS OF TAIL ROTOR DRIVE. THE REASON FOR THE SCREW FAILURE WAS NOT DETERMINED. ACFT HAD JUST BEEN RETURNED TO SERVICE FOLLOWING EXTENSIVE REPAIRS FOR DAMAGE SUSTAINED IN A PREVIOUS HARD LANDING.

## Aircraft

- Registration: [N2264U](https://openairdocs.org/aircraft/N2264U), registered now, S/N 426 (OpenAirDocs)
- Reported make and model: Brantly Helicopter B-2B
- Registry model: [Brantly B-2B](https://openairdocs.org/model/brantly-b-2b) (registry code 1440506) (OpenAirDocs)
- Registry engine: [Lycoming O&VO-360 series](https://openairdocs.org/engine/lycoming-o-vo-360-series) (registry code 41514, reciprocating) (OpenAirDocs)
- Category: Helicopter
- Serial number: 426
- Airframe hours: 2983
- Engines: LYCOMING VIO-360-A1A 180 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Operator: Robert D. Terrill
- Registered owner: Terrill, Robert D
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, February 9, 1988, 31 hours before
- Departed: 2M3
- Destination: 2M3
- Airport: 2M3, Sallisaw Muni

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 43; commercial; airplane ratings: single-engine land, multi-engine land; instrument ratings: helicopter, airplane; medical: class 2, valid medical--no waivers/lim.; seat: front; flight hours: 1,740 total, 1,055 as pilot in command, 22 in the last 90 days, 12 in the last 30 days, 1 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 350° at 4 knots
- Visibility: 15 statute miles
- Lowest ceiling: none
- Temperature: 93 °F, dew point 64 °F
- Altimeter: 29.00 inHg
- Observed at: FSM

## 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 19880825035249A](https://openairdocs.org/incident/19880825035249A), Aug 25, 1988: Hynes B2B, Sallisaw, OK, Substantial damage. Lost tail rotor control during 3 foot hover. Spun around, hit ground and rolled over. Driveshaft coupling failed.

## Other investigations on N2264U (4)

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 CHI75FEE65](https://openairdocs.org/ntsb/CHI75FEE65), May 20, 1975: Brantly B2B (N2264U), Wheeling, IL, substantial damage
- [NTSB CHI70FDJ15](https://openairdocs.org/ntsb/CHI70FDJ15), Apr 26, 1970: Brantly B2B (N2264U), Wis Dells, WI, substantial damage
- [NTSB FTW65A0098](https://openairdocs.org/ntsb/FTW65A0098), Mar 28, 1965: Brantly B2B (N2264U), Amarillo, TX, substantial damage
- [NTSB UNK65X1045](https://openairdocs.org/ntsb/UNK65X1045), Dec 18, 1964: Brantly B2B (N2264U), Hawthorn, PA, 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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