Casualties unknown

Left Main Landing Gear Separates During Takeoff on Ferry Flight (N9058P)

Denver, CO, US

On July 29, 1984, a DE Havilland DHC-7-100 (registration N9058P) was involved in an aviation accident near Denver, CO. 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 2026-07-04Data APIEditorial standards
Aircraft registered N9058P
Aircraft registered N9058P. Photo: Richard Silagi / CC BY-SA 4.0, via Wikimedia Commons

During takeoff, the left main landing gear and shock strut separated from a ferry aircraft. The pilot performed an emergency landing without the left main gear wheels. Investigation found misleading assembly procedures in the maintenance manual.

Incident Overview

Company maintenance personnel had disassembled and reassembled the left main landing gear of the aircraft. The aircraft was being ferried to another base for permanent landing gear repairs. During the takeoff phase of the ferry flight, the left main landing gear and its associated shock strut separated from the aircraft. The pilot performed an emergency landing without the left main gear wheels.

Investigation

An examination of the separated landing gear revealed that the upper bearing halves and the piston damping ring had been installed in accordance with the maintenance manual. However, a review of the maintenance manual disclosed that the assembly procedures for the landing gear were misleading.

Corrective Measures

Following the review, the manufacturer issued a temporary revision to the maintenance manual to address the misleading landing gear assembly procedures.

Frequently asked questions

What happened in the 29 Jul 1984 DE Havilland DHC-7-100 accident near Denver, CO?

During takeoff, the left main landing gear and shock strut separated from a ferry aircraft. The pilot performed an emergency landing without the left main gear wheels. Investigation found misleading assembly procedures in the maintenance manual.

What aircraft was involved and where did it happen?

The accident on 29 Jul 1984 involved a DE Havilland DHC-7-100, registration N9058P, at Denver, CO.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001214X40270. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.