Incident Overview

Date: Tuesday 15 December 1992
Aircraft Type: Volpar Turboliner II
Owner/operator: Mohican Air Service
Registration Number: N706M
Location: Cleveland, OH – ÿ United States of America
Phase of Flight: Take off
Status: Destroyed, written off
Casualties: Fatalities: 1 / Occupants: 1
Component Affected: The elevator control rod connecting bolt.The elevator control rod connecting bolt.
Investigating Agency: NTSBNTSB
Category: Accident
A Volpar Turboliner II cargo plane, a stretched turbine conversion of a Beechcraft SNB-5 Navigator, experienced a controlled descent and impact following a rotation during initial climb. The aircraft rolled to the right, pitched downward, and descended, ultimately impacting the ground at a 45-degree nose-down angle. The elevator malfunction, resulting in the full-up deflection, is believed to be the primary cause.A Volpar Turboliner II cargo plane, a stretched turbine conversion of a Beechcraft SNB-5 Navigator, experienced a controlled descent and impact following a rotation during initial climb. The aircraft rolled to the right, pitched downward, and descended, ultimately impacting the ground at a 45-degree nose-down angle. The elevator malfunction, resulting in the full-up deflection, is believed to be the primary cause.

Description

After rotation, during the initial climb, the nose of the airplane pitched up to approximately 60 degrees above the horizon. The airplane continued to climb until about 250 feet above the ground, then rolled right, pitched down and descended. The airplane impacted the ground, approximately 45 degrees nose down, 650 feet to the right of the runway. Post accident investigation of the wreckage revealed the elevator jammed in the full up deflection. The upper end of the elevator control rod was found not connected to the elevator, but was found laying aft, wedged between the tail cone and the elevator faring, holding the elevator in the full up position. The control rod connecting bolt was found laying in the bottom of the tail cone undamaged. The washer, nut and cotter pin related to the control rod connecting bolt were not found. The elevator had been removed, recovered and then installed by company maintenance personnel 166 flight hours prior to the accident. The aircraft, a Volpar Turboliner II cargo plane, was a stretched turbine conversion of a Beechcraft SNB-5 Navigator (Redesignated TC-45J in 1962) that was operated by the US Navy. The National Transportation Safety Board determines the probable cause(s) of this accident as follows: “The improper installation of the elevator by company maintenance personnel and the lack of proper inspections by a company certified mechanic/inspector and the FAA certified mechanic with inspector authorization. A factor in this accident was an insufficiently defined maintenance procedures that allowed multiple maintenance tasks to be combined into a single line entry.”

Primary Cause

Improper elevator installation by company maintenance personnel and a lack of adequate inspection by a certified mechanic/inspector, combined with a poorly defined maintenance procedure allowing multiple tasks to be combined.Improper elevator installation by company maintenance personnel and a lack of adequate inspection by a certified mechanic/inspector, combined with a poorly defined maintenance procedure allowing multiple tasks to be combined.

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