# NTSB SEA85LA218: Waco UIC, N13572, Boise, ID, September 20, 1985

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: September 20, 1985, 12:15 local (18:15 UTC)
- Place: Boise, ID
- Coordinates: 43.560211, -116.210975 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=43.5602&lon=-116.2110&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 40241
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA85LA218
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/40241/pdf
- Page: https://openairdocs.org/ntsb/SEA85LA218

## Sequence of events

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

- Loss of control - on ground/water, landing - roll
  - directional control - not maintained, pilot in command (cause)
  - ground loop/swerve - inadvertent
- Main gear collapsed, landing - roll
  - landing gear,main gear - overload
  - maintenance - improper, other maintenance personnel (contributing factor)

## Analysis

THE PLT REPORTED THAT WHEN HE LANDED, THE ACFT BEGAN DRIFTING TO THE LEFT. SINCE THERE WAS A HIGH SPEED TURN-OFF AHEAD, HE DID NOT MAKE AN IMMEDIATE CORRECTION FOR THE DRIFT. WHEN A CORRECTION WAS APPLIED, THE ACFT DID NOT RESPOND & IT CONTINUED INTO A GROUND LOOP. THE RIGHT MAIN GEAR THEN COLLAPSED UNDER A SIDE LOAD. DURING A REPAIR, THE RIGHT LANDING GEAR CABANE STRUT WAS FOUND TO HAVE BEEN PREVIOUSLY REPAIRED WITH UNDERSIZED MATERIAL.

## Aircraft

- Registration: [N13572](https://openairdocs.org/aircraft/N13572), registered now, S/N 3821, built 1933 (OpenAirDocs)
- Reported make and model: WACO UIC
- Registry model: [Waco UIC](https://openairdocs.org/model/waco-uic) (registry code 9600510) (OpenAirDocs)
- Registry engine: [Continental W670 series](https://openairdocs.org/engine/continental-w670-series) (registry code 17018, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 3821
- Engines: CONTINENTAL W-670 220 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Registered owner: Roland L Fowler
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, April 20, 1985, 90 hours before
- Departed: LGU, LOGAN, UT
- Flight plan: VFR
- Airport: BOI, Boise Air Terminal, runway 10L, 7,400 × 150 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 63; commercial; airplane ratings: single-engine sea, single-engine land; instrument ratings: airplane; medical: class 2, valid medical--w/ waivers/lim; seat: left; flight hours: 3,610 total, 112 in this make and model, 115 in the last 90 days, 7 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 250° at 3 knots
- Visibility: 30 statute miles
- Lowest ceiling: none
- Temperature: 57 °F, dew point 36 °F
- Altimeter: 30.00 inHg
- Observed at: BOI

## 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 19850920046689A](https://openairdocs.org/incident/19850920046689A), Sep 20, 1985: Waco U1C, Boise, ID, Substantial damage. When corrective action was applied to veer on runway right main collapsed. Prior gear strut repair improperly done.

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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