Casualties unknown

1988-11-16: Boeing 707-355C (N707MB) — Nmb, Singapore Ltd — Sanford, FL

Sanford, FL, US

On November 16, 1988, a Boeing 707-355C (registration N707MB) operated by Nmb, Singapore Ltd was involved in an aviation accident near Sanford, FL. Investigators recorded the probable cause as: The pilot's erratic handling of the aircraft during a visual approach and premature reduction of power at 50 feet AGL, which resulted in a hard 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 1781061362Data APIEditorial standards
Boeing 707-355C
Photo: USAF / Public domain, via Wikimedia Commons

A non-type rated FAA flight test engineer flying a visual approach chopped power at 50 feet, causing a hard landing that required the instructor pilot to execute a go-around.

What happened

During a flight test operation, the non-type rated FAA flight test engineer was conducting a visual approach to land. Observers noted that the aircraft's flight path was erratic throughout the final segment of the approach. As the aircraft descended to approximately 50 feet above ground level (AGL), the pilot abruptly reduced engine power to idle.

The sudden loss of energy resulted in a hard landing. The impact was significant enough that the instructor pilot, who was monitoring the operation, immediately took control of the aircraft. The instructor executed a go-around procedure to ensure safety and stability after the initial touchdown attempt failed.

The investigation

Following the incident, the flight continued to the final destination. Upon completion of the mission, a post-flight inspection was conducted on the airframe. The examination revealed minor damage consistent with the hard landing event. No further mechanical anomalies were reported during this specific inspection phase.

Findings

The primary factor in this event was the erratic handling of the aircraft by the pilot during the visual approach. The decision to chop power at such a low altitude, combined with the unstable flight path, directly led to the hard landing. The presence of an instructor pilot allowed for a safe recovery via go-around, preventing potential structural failure or injury.

Safety message

This incident highlights the critical importance of stable approaches and proper energy management during the final phase of flight. Pilots must maintain precise control and avoid abrupt power changes at low altitudes unless executing a specific, planned maneuver. Non-type rated pilots operating complex aircraft require strict supervision to ensure adherence to standard operating procedures.

Probable cause

The pilot's erratic handling of the aircraft during a visual approach and premature reduction of power at 50 feet AGL, which resulted in a hard landing.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001213X27297. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.