No fatalities

Propeller Separation Forces Emergency Landing in Experimental Amphibian (N9224T)

Sebring, FL, US

On April 14, 1999, a Zemp AVID CATALINA (registration N9224T) operated by Adrian M. Zemp was involved in an aviation accident near Sebring, FL. No fatalities were reported. Investigators recorded the probable cause as: The in-flight separation of one of the propeller blade's and one of the engine's exhaust pipes causing the engine to vibrate until it stopped running. A related factor was the unsuitable terrain for the forced landing. 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

An experimental pusher-engine amphibian experienced propeller blade separation during cruise at 1,000 feet AGL, leading to engine failure and an emergency landing in an abandoned orange grove, resulting in substantial airframe damage.

Incident Overview

During cruise flight at an altitude of 1,000 feet above ground level, the pilot of an experimental, pusher-engine, hull-configured amphibian reported that the aircraft sustained a separation of one or more propeller blades. In response to severe vibration, the pilot reduced power, which caused the engine to quit. With no other options, the pilot initiated an emergency landing to a clear area within an abandoned orange grove.

Impact and Damage

The aircraft collided with sand furrows and high vegetation during the landing, resulting in heavy damage to the airframe.

Wreckage Examination

Post-accident examination of the wreckage revealed that two of the three composite propeller blades were missing. Additionally, the engine's left/front exhaust pipe was absent; only the attaching hardware at the exhaust port remained, along with a short stub exhibiting a 360-degree circumferential crack.

No further information was provided regarding the aircraft registration, date, operator, location, occupants, injuries, or other environmental factors.

Frequently asked questions

What happened in the 14 Apr 1999 Zemp AVID CATALINA accident near Sebring, FL?

An experimental pusher-engine amphibian experienced propeller blade separation during cruise at 1,000 feet AGL, leading to engine failure and an emergency landing in an abandoned orange grove, resulting in substantial airframe damage.

Were there any fatalities in the 14 Apr 1999 Zemp AVID CATALINA accident?

No fatalities were recorded in this accident.

What aircraft was involved and where did it happen?

The accident on 14 Apr 1999 involved a Zemp AVID CATALINA, registration N9224T, operated by Adrian M. Zemp, at Sebring, FL.

What was the probable cause of the accident?

The in-flight separation of one of the propeller blade's and one of the engine's exhaust pipes causing the engine to vibrate until it stopped running. A related factor was the unsuitable terrain for the forced landing.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001205X00532. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.