# NTSB SEA86LA110: Robinson R22-A, N8536Z, Portland, OR, April 25, 1986

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: April 25, 1986, 07:30 local (15:30 UTC)
- Place: Portland, OR
- Location: 45.5235° N, 122.6762° W: Placed by OpenAirDocs: center of Portland, OR, within about 7 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=45.5235&lon=-122.6762&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 40393
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA86LA110
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/40393/pdf
- Page: https://openairdocs.org/ntsb/SEA86LA110

## Sequence of events

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

- Loss of engine power, cruise
  - reason for occurrence undetermined (cause)
- Forced landing, descent - emergency
- Hard landing, landing - flare/touchdown
  - weather condition - tailwind (contributing factor)
  - compensation for wind conditions - not possible, pilot in command (cause)
  - object - wire,static (contributing factor)
  - proper descent rate - not possible, pilot in command (cause)

## Analysis

AT APRX 500 FT AGL, WHILE ON A LOCAL TRAFFIC WATCH, A LOSS OF PWR OCCURRED. A 15 KT TAIL WIND WAS PRESENT. PWR LINES HAD TO BE CLEARED AND A HARD LANDING RESULTED. AN EXAMINATION AND TEST RUN OF THE ENG FAILED TO DISCLOSE ANY FAILURE/ MALFUNCTION WHICH WOULD HAVE RESULTED IN THE PWR LOSS.

## Aircraft

- Registration: N8536Z (not matched to a registry record)
- Reported make and model: ROBINSON R22-A
- Category: Helicopter
- Serial number: 0439
- Airframe hours: 1090
- Engines: LYCOMING O-320-B2C 124 horsepower reciprocating
- Damage: Substantial damage
- Flight: Part 91
- Registered owner: T And T Equipment
- Airworthiness certificate: Standard, Normal
- Last inspection: 100 hour, April 10, 1986
- Departed: HIO, HILLSBORO, OR

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 33; commercial; airplane ratings: single-engine land; medical: class 2, valid medical--no waivers/lim.; seat: front; flight hours: 448 total, 107 in this make and model, 236 as pilot in command, 69 in the last 90 days

## Weather

- Conditions: Visual (VMC), Day
- Wind: 230° at 10 knots, gusting 15
- Visibility: 7 statute miles
- Lowest ceiling: 2,000 ft overcast
- Temperature: 52 °F, dew point 52 °F
- Altimeter: 29.00 inHg

## 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 19860425014159A](https://openairdocs.org/incident/19860425014159A), Apr 25, 1986: Robsin R22, Portland, OR, Substantial damage. Engine lost power during traffic watch flight. Hard landing on off ramp. No reason for the power loss determined.

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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