Casualties unknown

Aircraft Enters Severe Thunderstorm and Crashes After Loss of Radar Contact (N88JH)

Lincoln, MT, US

On June 19, 1998, a Cessna 340 (registration N88JH) operated by Curtis M. Moeller was involved in an aviation accident near Lincoln, MT. Investigators recorded the probable cause as: The pilot's improper or inadequate use of the aircraft's weather avoidance equipment, resulting in penetration of a Level 4 thunderstorm and subsequent loss of aircraft control from which the pilot did not recover. 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 2026-09-03Data APIEditorial standards

An aircraft entered a Level 4 thunderstorm during an IFR flight, lost radar contact after a turn, and crashed 1.5 miles from its last known position. Logbooks showed the pilot was not current for IFR.

Preflight and Departure Information During the preflight weather briefing, the pilot was informed to expect rain showers and thunderstorms up to Level 6 intensity along the planned route. The aircraft was equipped with radar and Stormscope equipment. The pilot filed an instrument flight rules (IFR) flight plan and departed under IFR. Upon radar contact, air traffic control (ATC) cleared the pilot direct to the destination. ## In-Flight Events and Loss of Contact Twenty-one minutes after departure, while flying on a direct northwesterly track, the aircraft entered a Level 4 thunderstorm cell. The pilot reported to ATC: '...[I] hit a pretty heavy cell here [I've] got lightning all around and picking up some hard ice.' A crew member from another aircraft deviating north of the storm suggested the pilot turn north to exit the weather. ATC relayed this suggestion, and the pilot confirmed he was turning north. The aircraft entered a right turn, and radar contact was lost after approximately 90 degrees of turn. Six seconds after the last radar position, the pilot transmitted: '...[I'm] in a tremendous downdraft [I'm] losing altitude six thousand.' This was the final transmission from the aircraft. ## Search and Recovery A search was initiated, and the wreckage was found approximately 11.5 hours later, about 1.5 miles south of the last radar position. Logbooks recovered from the wreckage indicated the pilot was not current for IFR flight.

Frequently asked questions

What happened in the 19 Jun 1998 Cessna 340 accident near Lincoln, MT?

An aircraft entered a Level 4 thunderstorm during an IFR flight, lost radar contact after a turn, and crashed 1.5 miles from its last known position. Logbooks showed the pilot was not current for IFR.

What aircraft was involved and where did it happen?

The accident on 19 Jun 1998 involved a Cessna 340, registration N88JH, operated by Curtis M. Moeller, at Lincoln, MT.

What was the probable cause of the accident?

The pilot's improper or inadequate use of the aircraft's weather avoidance equipment, resulting in penetration of a Level 4 thunderstorm and subsequent loss of aircraft control from which the pilot did not recover. Factors included a thunderstorm and the pilot's lack of instrument currency.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001211X10419. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.