# NTSB FTW84LA036: Robinson R22, N9074Y, Oklahoma City, OK, October 30, 1983

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: October 30, 1983, 07:58 local (13:58 UTC)
- Place: Oklahoma City, OK
- Coordinates: 35.580642, -97.569099 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=35.5806&lon=-97.5691&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): 21191
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW84LA036
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/21191/pdf
- Page: https://openairdocs.org/ntsb/FTW84LA036

## Sequence of events

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

- Loss of control - in flight, hover
  - preflight planning/preparation - inadequate, pilot in command (cause)
  - terrain condition - soft (contributing factor)
  - unsuitable terrain or takeoff/landing/taxi area - not identified, pilot in command (cause)
  - landing gear,skid assembly - movement restricted (contributing factor)
  - rotorcraft flight controls - improper use of, pilot in command (cause)
- Roll over, hover

## Analysis

THE PLT REPORTED THAT HE INTENDED TO PRACTICE HOVERING WITHIN THE ARPT BOUNDRIES. ACCORDING TO HIM, AS THE RPM WAS INCREASED TO 100% FOR LIFT-OFF, THE RIGHT SKID CAME OFF THE GROUND, BUT THE LEFT SKID WAS 'EVIDENTLY STUCK IN THE SOFT GROUND.' RIGHT CYCLIC WAS APPLIED AS THE LEFT SKID CAME FREE FROM THE SOFT TERRAIN. THE PLT SAID THAT THIS RESULTED IN AN UNUSUALLY STEEP BANK TO THE RIGHT. LEFT CYCLIC WAS THEN APPLIED IN AN UNSUCCESSFUL EFFORT TO MAINTAIN CONTROL OF THE ACFT. THE PLT REPORTED THE ENG RPM THEN BEGAN DECREASING & DIRECTOINAL CONTROL WAS LOST. SUBSEQUENTLY, THE HELICOPTER SETTLED BACK TO THE GROUND & ROLLED OVER ON ITS SIDE.

## Aircraft

- Registration: N9074Y (not matched to a registry record)
- Reported make and model: ROBINSON R22
- Category: Helicopter
- Serial number: 0241
- Airframe hours: 874
- Engines: LYCOMING O-320 124 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Registered owner: Oklahoma Aviation Company
- Airworthiness certificate: Standard, Normal
- Airport: PWA, Wiley Post

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 31; flight instructor, commercial; airplane ratings: single-engine land; medical: class 2, unknown; seat: right; flight hours: 863 total, 745 in this make and model, 788 as pilot in command, 88 in the last 90 days, 5 in the last 24 hours

## Weather

- Conditions: Instrument (IMC), Day
- Wind: 20° at 8 knots
- Visibility: 5 statute miles
- Lowest ceiling: 400 ft
- Altimeter: 30.00 inHg
- Observed at: PWA

## 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 19831030074249A](https://openairdocs.org/incident/19831030074249A), Oct 30, 1983: Robsin R22, Oklahoma City, OK, Substantial damage. One skid stuck in mud during lift off causing helicopter to roll over on its side.

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.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.