Dornier 328-100 N329MX

Summary

On 20 March 2000 at about 14:31 local time, a Dornier 328-100 registered N329MX, operated by Air Wisconsin, Inc., was involved in an accident near Denver, Colorado, United States. 24 people were on board and nobody was injured. The aircraft was substantially damaged. The NTSB has published a probable cause for this accident; it is quoted in full below.

Date

20 March 2000 at 14:31

Classification

Accident

Location

Denver, Colorado, United States

Nearest airport

Denver International (DEN)

Coordinates

39.8507, -104.6995

Aircraft

Dornier 328-100

Registration

N329MX

Category

Airplane

Engines

2

Operator

Air Wisconsin, Inc.

Operating rule

Part 121: Air Carrier

Purpose of flight

Unknown

Phase of flight

Not recorded

Route

Bismarck → Unknown

Aircraft damage

Substantial

Weather

VMC

Light

Day

NTSB number

DEN00FA063

Nobody was injured.

uncommanded retraction of the nose and right main landing gears during landing roll for reasons undetermined.

Quoted verbatim from the NTSB record. This site does not paraphrase or interpret it.

Read the full NTSB narrative

During the approach, the flight crew confirmed the landing gear was down and locked. The first officer landed the airplane on runway 35L in a slight left crosswind. When the airplane touched down, the landing gear warning horn sounded. The right main and nose landing gears retracted, and the airplane slid to a halt on the right side of the runway. According to the flight data recorder, the landing gear was extended and indicated down and locked (source data is the position of the nose landing gear). The nose landing gear became "unlocked" (i.e., unsafe) 2 seconds after the radio altitude reached 0 feet. Hydraulic pressure dropped to approximately 2,700 psi momentarily, then returned to normal (about 3,000 psi). The following items were subjected to various tests and no anomalies were noted: proximity switch electronics unit (PSEU), right main landing gear harness and proximity switches, landing gear selector valve, hydraulic pressure sensing valve, landing gear control assembly. Hydraulic fluid samples drawn from the filter pack, right main landing gear down lock assist actuator, and the return line for the landing gear selector valve were analyzed. No significant anomalies were noted. Partial systemic wiring tests were unremarkable.

Quoted verbatim from the NTSB record.