No fatalities

16 Dec 2008: AIR TRACTOR AT-502 — Gilbert Aviation Industries INC — Dinuba, CA

Dinuba, CA, United States

On 16 Dec 2008, an AIR TRACTOR AT-502 operated by Gilbert Aviation Industries INC was involved in an aviation accident near Dinuba, CA. No fatalities were reported. Investigators recorded the probable cause as: The engine's Py line had not been secured properly, which prevented proper fuel scheduling to the engine's fuel control unit, leading to a complete loss of engine power. This summary draws on records from NTSB; 12 related events involving the same aircraft type or operator are linked below.

SourcesNTSBPrimary reportUpdated 1778583330Data APIEditorial standards

A pilot experienced complete engine power loss during a spray pass, leading to a forced landing and nose-over. An FAA inspection found an improperly secured Py line affecting fuel scheduling and substantial left wing tip damage.

Accident Overview

A pilot reported a complete loss of engine power approximately halfway through the first spray pass of an agricultural application flight. The pilot pulled up from the field, jettisoned the spray load, and elected to land straight ahead in an adjoining field.

Landing and Nose-Over

After touchdown, the pilot held the control stick back. The tail began to lift, and before the aircraft stopped, it nosed over and came to rest inverted.

Post-Accident Examination

A Federal Aviation Administration (FAA) airworthiness aviation safety inspector conducted a post-accident examination of the aircraft. The aircraft's most recent annual inspection had been completed the day prior to the accident. The inspector found that the engine's Py line had not been secured properly, a condition that would have prevented proper fuel scheduling to the engine's fuel control unit. Additionally, the inspector reported that the outboard leading edge of the left wing tip had sustained substantial damage, which would have adversely affected the flight characteristics of the aircraft.

Probable cause

The engine's Py line had not been secured properly, which prevented proper fuel scheduling to the engine's fuel control unit, leading to a complete loss of engine power.

Contributing factors

Causes

Incorrect service/maintenanceMaintenance personnel

Other contributing factors

Ability to respond/compensate