Casualties unknown

1995-05-24: Cessna 177B (N621PW) — Allentown, PA

Allentown, PA, US

On May 24, 1995, a Cessna 177B (registration N621PW) was involved in an aviation accident near Allentown, PA. Investigators recorded the probable cause as: The pilot's failure to maintain proper control of the descent rate during landing, resulting in a bounced landing that damaged the nose wheel, propeller, and engine firewall. 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 1781061362Data APIEditorial standards

A light aircraft sustained significant structural damage after bouncing during a hard landing on runway 24. The pilot reported porpoising upon touchdown, resulting in contact with the nose wheel and subsequent damage to the propeller and engine firewall.

What happened

The flight involved a routine approach to runway 24. During the final phase of the landing sequence, the aircraft experienced a hard touchdown. The pilot described being on short final when setting up for the landing approach. Upon crossing the runway threshold in the configured landing state, the main wheels made initial contact with the pavement.

Instead of settling onto the runway surface, the aircraft ballooned or porpoised back into the air. The aircraft then descended again, this time impacting the ground on its nose gear. This secondary impact caused substantial damage to the forward section of the airframe.

The investigation

Post-acc examination revealed extensive damage resulting from the bounce. The nose wheel assembly was compromised by the hard contact with the runway surface. Additionally, the propeller blades sustained damage, likely due to the altered pitch or angle during the nose-down impact. The engine firewall also showed signs of structural stress and deformation consistent with the forces generated during the bounce.

Findings

The primary factor in this incident was the pilot's inability to arrest the descent rate effectively after the initial main gear touchdown. The resulting porpoising motion transferred excessive vertical load to the nose landing gear, which is not designed to absorb such energy repeatedly. This led to the cascading damage observed on the propeller and firewall.

Probable cause

The pilot's failure to maintain proper control of the descent rate during landing, resulting in a bounced landing that damaged the nose wheel, propeller, and engine firewall.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001207X03543. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.