Casualties unknown

Porpoising Landing Leads to Propeller Strike (N9897F)

Imperial, CA, US

On May 18, 1999, a Cessna 172R (registration N9897F) operated by George MC Jimsey was involved in an aviation accident near Imperial, CA. Investigators recorded the probable cause as: The pilot's misjudged landing flare, which led to an inadvertent porpoise condition. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive; 1 related events involving the same aircraft type or operator are linked below.

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

A pilot porpoised during landing, causing the propeller to strike the ground and damage the cowling and firewall. The incident followed confusion over which runway was active.

Approach and Runway Confusion

While inbound to the airport, the pilot requested a landing advisory from the Common Traffic Advisory Frequency (CTAF). The advisory indicated that runway 14 was in use. As the pilot neared the airport, another aircraft requested advisories and was told that runway 32 was in use; that aircraft subsequently landed on runway 32. The pilot attempted to contact the CTAF to verify that runway 32 was now the active runway, but received no response.

Landing Attempt

Deciding to enter right traffic for runway 32, the pilot noted that the windsock indicated no wind. During the approach, she overshot the turn to final but corrected to align with the runway centerline. The flare was initiated too high, and the pilot tried to correct the resulting descent rate. However, during the landing, the aircraft began to porpoise, oscillating nose-up and nose-down.

Propeller Strike and Aftermath

As the aircraft porpoised, the propeller struck the ground. The impact buckled the cowling and the firewall. After the landing, the pilot taxied the aircraft clear of the runway and shut down the engine.

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Frequently asked questions

What happened in the 18 May 1999 Cessna 172R accident near Imperial, CA?

A pilot porpoised during landing, causing the propeller to strike the ground and damage the cowling and firewall. The incident followed confusion over which runway was active.

What aircraft was involved and where did it happen?

The accident on 18 May 1999 involved a Cessna 172R, registration N9897F, operated by George MC Jimsey, at Imperial, CA.

What was the probable cause of the accident?

The pilot's misjudged landing flare, which led to an inadvertent porpoise condition.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001212X18814. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.