Casualties unknown

Non-instrument Rated Pilot Collides with Trees During Descent in IMC (N68700)

Heavener, OK, US

On July 20, 1988, a Cessna 152 (registration N68700) operated by Nichollos Aviation Inc. was involved in an aviation accident near Heavener, OK. Investigators recorded the probable cause as: The pilot's decision to continue flight into instrument meteorological conditions without appropriate instrument rating, which resulted in loss of control and collision with trees. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive; 8 related events involving the same aircraft type or operator are linked below.

Sourcesthe U.S. National Transportation Safety Board (NTSB) historical archivePrimary reportUpdated 2026-06-22Data APIEditorial standards

A non-instrument rated pilot flying a cross-country training flight entered instrument meteorological conditions while descending and subsequently collided with trees after failing to regain visual flight rules.

What happened

During a cross-country training flight, the pilot, who was not instrument rated, encountered instrument meteorological conditions (IMC) while in the process of descending. Recognizing the deteriorating weather, the pilot attempted to climb to reach VFR conditions but was unsuccessful. Subsequently, the pilot initiated another descent in an effort to break out of the clouds and return to visual flight rules. During this second descent, the aircraft collided with trees.

The investigation

The investigation focused on the sequence of events leading to the collision. It was determined that the primary factor was the pilot's decision to continue flying into known IMC without appropriate instrument ratings or equipment. The failure to maintain situational awareness and the inability to navigate safely in cloud conditions led directly to the loss of control and impact with terrain.

Findings

The key findings include:

  • The pilot was not instrument rated.
  • The aircraft entered IMC during a training flight.
  • Attempts to climb and descend to escape IMC were unsuccessful.
  • The aircraft collided with trees during the descent.

Safety message

Pilots without instrument ratings should avoid flying into known or forecast IMC conditions. Training flights must include adequate weather planning and alternatives to ensure safety if conditions deteriorate unexpectedly.

Probable cause

The pilot's decision to continue flight into instrument meteorological conditions without appropriate instrument rating, which resulted in loss of control and collision with trees.

All Cessna 152 accidents →

Frequently asked questions

What happened in the 20 Jul 1988 Cessna 152 accident near Heavener, OK?

A non-instrument rated pilot flying a cross-country training flight entered instrument meteorological conditions while descending and subsequently collided with trees after failing to regain visual flight rules.

What aircraft was involved and where did it happen?

The accident on 20 Jul 1988 involved a Cessna 152, registration N68700, operated by Nichollos Aviation Inc., at Heavener, OK.

What was the probable cause of the accident?

The pilot's decision to continue flight into instrument meteorological conditions without appropriate instrument rating, which resulted in loss of control and collision with trees.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001213X26227. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.