# NTSB SEA84LA046: Lark IS28B2, N4014B, Issaquqh, WA, January 29, 1984

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: January 29, 1984, 15:30 local (23:30 UTC)
- Place: Issaquqh, WA
- Coordinates: 47.49945, -121.999389 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=47.4995&lon=-121.9994&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): 39868
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA84LA046
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/39868/pdf
- Page: https://openairdocs.org/ntsb/SEA84LA046

## Sequence of events

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

- In flight encounter with weather, cruise - normal
  - weather condition - downdraft (contributing factor)
  - weather evaluation - inaccurate, pilot in command(cfi) (cause)
  - weather condition - turbulence (contributing factor)

## Analysis

THE CFI STATED THAT WHILE RETURNSING TO THE AIRPORT HE ENCOUNTERED TURBULENCE. WHEN IT BECAME OBVIOUS THAT REACHING THE INTENDED AIRPORT WOULD BE MARGINAL ANOTHER LANDING FIELD WAS CHOSEN. DURING TURN TO FINAL, THE LEFT WING TIP STRUCK A POWER POLE AND THE ACFT PANCAKED INTO AN ADJACENT PASTURE.

## Aircraft

- Registration: [N4014B](https://openairdocs.org/deregistered/N4014B-2012-11-15), registration cancelled 2012-11-15, S/N 91, built 1977 (OpenAirDocs)
- Reported make and model: Lark Aviation IS28B2
- Registry model: [I.C.A.-Brasov IS-28B2](https://openairdocs.org/model/i-c-a-brasov-is-28b2) (registry code 4490102) (OpenAirDocs)
- Registry engine: [NONE](https://openairdocs.org/engine/none) (registry code 00000, none) (OpenAirDocs)
- Category: Glider
- Serial number: 91
- Airframe hours: 1322
- Engines: NONE NONE unknown
- Damage: Substantial damage
- Flight: Instructional, Part 91
- Registered owner: Stanley S. Barclay
- Airworthiness certificate: Standard, Normal
- Last inspection: 100 hour, December 1, 1983, 16 hours before
- Departed: 3WA1, ISSAQUAH, WA

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 57; commercial, flight instructor; medical: unknown; seat: front; flight hours: 3,500 total, 3,500 in this make and model, 3,500 as pilot in command, 18 in the last 90 days, 2 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 190° at 10 knots
- Visibility: 10 statute miles
- Lowest ceiling: 1,900 ft broken
- Temperature: 55 °F, dew point 46 °F
- Altimeter: 30.00 inHg
- Observed at: BFI, 8 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 19840129006779A](https://openairdocs.org/incident/19840129006779A), Jan 29, 1984: Brasov IS28B2, Issaquah, WA, Substantial damage. Glider pilot encountered downdrafts and attempted off airport landing but struck powerpoles and crashed.

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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