Casualties unknown

Night Practice Instrument Flight Ends in Mountain Impact Near Centennial Airport (N45E)

Palmer Lake, CO, US

On October 28, 2001, a Cessna T337G (registration N45E) was involved in an aviation accident near Palmer Lake, CO. Investigators recorded the probable cause as: the pilot intentionally restricting his external vision (turning his cabin lights up bright to practice night instrument approaches), and his subsequent failure to maintain clearance of the mountain. 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

A pilot practicing instrument approaches at night descended from assigned altitude and impacted a mountain after requesting and executing a hold and a deviation from the approach fix.

Flight Details

The pilot departed Centennial Airport, elevation 5,883 feet, on a VFR flight to practice multiple instrument approaches at night. Prior to departure, he told his wife that he would turn the cockpit lights up bright to facilitate instrument training.

Sequence of Events

After completing two ILS approaches, the pilot requested from ATC two turns in the holding pattern before flying additional approaches. The controller cleared him for practice holding and assigned an altitude of 9,000 feet. During the inbound track of 347 degrees, radar data indicated that the airplane descended from its assigned altitude to 7,600 feet. No ATC intervention occurred during this descent.

Subsequently, the pilot requested to depart the initial approach fix to the southeast for approximately 15 nautical miles at 8,500 feet. The controller cleared the request but did not terminate radar services. The pilot flew south for approximately 8 nautical miles, then turned to a heading of 210 degrees.

Accident

Approximately five minutes after the turn, the airplane impacted a mountain. No further details regarding injuries, damage, or aircraft identification are available from the source.

Frequently asked questions

What happened in the 28 Oct 2001 Cessna T337G accident near Palmer Lake, CO?

A pilot practicing instrument approaches at night descended from assigned altitude and impacted a mountain after requesting and executing a hold and a deviation from the approach fix.

What aircraft was involved and where did it happen?

The accident on 28 Oct 2001 involved a Cessna T337G, registration N45E, at Palmer Lake, CO.

What was the probable cause of the accident?

the pilot intentionally restricting his external vision (turning his cabin lights up bright to practice night instrument approaches), and his subsequent failure to maintain clearance of the mountain. A contributing factor was the Air Traffic Controller’s failure to provide appropriate safety alerts for rising terrain.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20011109X02221. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.