# NTSB SEA94LA222: Boeing A75N1, N73617, Caldwell, ID, August 28, 1994

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Limited investigation · Final report
- Date: August 28, 1994, 11:30 local (17:30 UTC)
- Place: Caldwell, ID
- Coordinates: 43.660293, -116.629356 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=43.6603&lon=-116.6294&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 2 minor
- Status: Completed, report October 13, 1995
- Report: Approved by Office Director
- NTSB case key (mKey): 42008
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA94LA222
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/42008/pdf
- Page: https://openairdocs.org/ntsb/SEA94LA222

## Probable cause

THE JAMMING OF THE RIGHT MAIN LANDING GEAR BRAKE DUE TO AN ACCUMULATION OF A GUMMY DEPOSIT.

## Sequence of events

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

- Nose over, landing - roll
  - landing gear,normal brake system - jammed (cause)
  - landing gear,normal brake system - foreign material/substance (cause)

## Analysis

AFTER TOUCHDOWN, THE RIGHT MAIN GEAR BRAKE LOCKED UP DUE TO A GUMMY DEPOSIT THAT WOULD NOT ALLOW IT TO RELEASE. AS THE LANDING ROLL CONTINUED, THE AIRCRAFT SLOWLY NOSED OVER.

## Factual narrative

On August 28, 1994, approximately 1130 mountain daylight time (MDT), a Boeing A75N1, N73617, nosed over during the landing roll at Caldwell Industrial Airport, Caldwell, Idaho. The commercial pilot and his passenger received minor injuries, and the aircraft sustained substantial damage. The personal pleasure flight, which departed the same location about five minutes earlier, was being operated in visual meteorological conditions at the time of the accident. No flight plan had been filed, and there was no report of an ELT activation.

According to the pilot, the right brake locked up during the landing roll, and as the landing roll progressed, the aircraft slowly nosed over on the runway. It was later discovered that there was a gummy deposit on the right brake mechanism which would not allow the brake to release.

## Aircraft

- Registration: [N73617](https://openairdocs.org/aircraft/N73617), registered now, S/N 75-3702, built 1942 (OpenAirDocs)
- Reported make and model: BOEING A75N1
- Registry model: [Boeing A75N1(PT17)](https://openairdocs.org/model/boeing-a75n1-pt17) (registry code 1380134) (OpenAirDocs)
- Registry engine: [Continental R670-SERIES series](https://openairdocs.org/engine/continental-r670-series-series) (registry code 17016, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 75-3702
- Airframe hours: 3809
- Engines: CONTINENTAL R-670 220 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Registered owner: Renfro, Robert D.
- Airworthiness certificate: Standard, Aerobatic
- Last inspection: Annual, November 5, 1993, 5 hours before
- Airport: U35, Caldwell Industrial, runway 30, 5,500 × 100 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 49; commercial; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 2, valid medical--w/ waivers/lim; seat: right; flight hours: 5,432 total, 21 in this make and model, 58 in the last 90 days, 34 in the last 30 days

## Weather

- Conditions: Visual (VMC), Day
- Wind: calm
- Visibility: 30 statute miles
- Lowest ceiling: none
- Temperature: 81 °F

## 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 19940828023809A](https://openairdocs.org/incident/19940828023809A), Aug 28, 1994: Boeing A75N1, Caldwell, ID, Substantial damage. Nosed over on landing roll. Reported right brake locked up. Found gummy deposit on brake mechanism.

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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