No fatalities

Float-Equipped Aircraft Damaged During Water Landing After Encountering Unseen Swell (N9732B)

Mercer Island, WA, US

On May 6, 2001, a Cessna 180A (registration N9732B) operated by Richard M. Pattison was involved in an aviation accident near Mercer Island, WA. No fatalities were reported. Investigators recorded the probable cause as: the pilot's inadequate visual lookout during an approach and landing in open water. Factors include a large wave/swell at the location where the pilot elected to land his float-equipped airplane. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.

Sourcesthe U.S. National Transportation Safety Board (NTSB) historical archivePrimary reportUpdated 2026-07-04Data APIEditorial standards

A pilot executed a water landing in a float-equipped airplane after circling to observe conditions. Touching down in relatively calm water, the aircraft suddenly encountered a large wave, was launched back into the air, and during a go-around attempt, it stalled and dropped back onto the water, causing substantial structural damage.

Incident Overview

A pilot flying a float-equipped airplane experienced a landing incident on water that resulted in substantial damage to the aircraft. The pilot had first circled the area to assess the water conditions before initiating the landing.

Sequence of Events

The pilot executed a water landing, touching down in relatively calm conditions. Almost immediately after touchdown, the aircraft encountered a large wave or swell that the pilot had not noticed from the air. This wave caused the aircraft to be momentarily launched back into the air.

In response, the pilot applied full power to initiate a go-around. However, by that point the aircraft had already slowed to a speed at which it could not maintain flight. Consequently, the aircraft dropped back to the water's surface with sufficient force to cause substantial damage to its structure.

No other details about the aircraft, pilot, or location are provided in the source.

Frequently asked questions

What happened in the 6 May 2001 Cessna 180A accident near Mercer Island, WA?

A pilot executed a water landing in a float-equipped airplane after circling to observe conditions. Touching down in relatively calm water, the aircraft suddenly encountered a large wave, was launched back into the air, and during a go-around attempt, it stalled and dropped back onto the water, causing substantial…

Were there any fatalities in the 6 May 2001 Cessna 180A accident?

No fatalities were recorded in this accident.

What aircraft was involved and where did it happen?

The accident on 6 May 2001 involved a Cessna 180A, registration N9732B, operated by Richard M. Pattison, at Mercer Island, WA.

What was the probable cause of the accident?

the pilot's inadequate visual lookout during an approach and landing in open water. Factors include a large wave/swell at the location where the pilot elected to land his float-equipped airplane.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20010522X00999. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.