# NTSB SEA83FA141: Monnett - Larsen Moni, N83GL, Albany, OR, June 30, 1983

- Type: NTSB accident investigation
- Classification: Accident · Fatal · Field investigation · Final report
- Date: June 29, 1983, 19:35 local (Jun 30, 1983, 02:35 UTC)
- Place: Albany, OR
- Coordinates: 44.620948, -123.130416 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=44.6209&lon=-123.1304&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: Fatal
- Injuries: 1 fatal
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 39621
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA83FA141
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/39621/pdf
- Page: https://openairdocs.org/ntsb/SEA83FA141

## Sequence of events

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

- Airframe/component/system failure/malfunction, maneuvering
  - wing - failure,total (cause)
  - instructions,written/verbal - not followed, other maintenance personnel (cause)
  - inadequate quality control, other maintenance personnel (cause)
  - wing - separation (contributing factor)
- Loss of control - in flight, maneuvering
- In flight collision with terrain/water, descent - uncontrolled

## Analysis

THE HOME BUILT, POWERED GLIDER WAS BEING FLOWN ON A LOCAL TEST FLIGHT. ACCORDING TO WITNESSES, THE ACFT WAS IN UNPOWERED FLT (GLIDING) WHEN IT ENTERED A DESCENT & CRASHED. AT ABOUT THE SAME TIME IT BEGAN DESCENDING, THEY OBSERVED SOMETHING SEPARATE FROM THE ACFT THAT APPEARED TO BE A WING. AN EXAM OF THE WRECKAGE REVEALED THE LEFT WING SKIN HAD SEPARATED FROM THE SPAR. THE LEFT SPAR WAS STILL ATTACHED TO THE FUSELAGE AND WAS BENT & TWISTED TOWARD THE TIP. THE ACFT HAD COME TO REST INVERTED & BOTH STABILIZERS OF THE V-TAIL HAD BROKEN. THE LEFT STABILIZER & LEFT WING SKIN WERE FOUND 185 & 300 FT, RESPECTIVELY, FROM THE MAIN WRECKAGE. AN INSPECTION OF THE LEFT WING REVEALED THAT THE SKIN HAD BEEN ATTACHED TO THE RIBS, BUT HAD NOT BEEN BONDED TO THE SPAR. ACCORDING TO THE ASSEMBLY INSTRUCTIONS, THE SKIN SHOULD HAVE BEEN BOND WITH EPOXY TO BOTH THE TOP & BOTTOM OF THE SPAR.

## Aircraft

- Registration: [N83GL](https://openairdocs.org/deregistered/N83GL-2012-11-15), registration cancelled 2012-11-15, S/N 00083, built 1983 (OpenAirDocs)
- Reported make and model: MONNETT - LARSEN MONI
- Registry model: [Larsen Gerald C MONI](https://openairdocs.org/model/larsen-gerald-c-moni) (registry code 05659X4) (OpenAirDocs)
- Registry engine: [Amateur-built UNKNOWN ENG](https://openairdocs.org/engine/amateur-built-unknown-eng) (registry code 99999) (OpenAirDocs)
- Category: Airplane, amateur-built
- Serial number: 83
- Airframe hours: 11
- Engines: KFM 107 22 horsepower reciprocating
- Damage: Destroyed
- Flight: Part 91
- Registered owner: Gerald Clyde Larsen
- Airworthiness certificate: Special, Experimental (Special)
- Last inspection: Unknown, May 11, 1983, 11 hours before
- Airport: S12, Albany Municipal, runway 34, 3,000 × 95 ft

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 38; private; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 3, valid medical--w/ waivers/lim; seat: front; toxicology performed; flight hours: 500 total, 11 in this make and model

## Weather

- Conditions: Visual (VMC), Day
- Wind: 250° at 7 knots
- Visibility: 20 statute miles
- Lowest ceiling: none
- Temperature: 64 °F, dew point 54 °F
- Altimeter: 29.00 inHg
- Observed at: SLE, 15 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 19830629030459A](https://openairdocs.org/incident/19830629030459A), Jun 29, 1983: Amtr MONI, Albany, OR, Destroyed. Witnesses observed part of left wing departing aircraft before crash.

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.