NTSB Identification: CHI88FA153.
The docket is stored on NTSB microfiche number 39448.
Accident occurred Sunday, July 03, 1988 in HAMM LAKE, MN
Probable Cause Approval Date: 06/11/1990
Aircraft: PIPER PA-38-112, registration: N2485N
Injuries: 2 Fatal.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

THE ACCIDENT AIRPLANE COLLIDED WITH TERRAIN WHILE IN AN UNCONTROLLED DESCENT WHICH OCCURRED DURING A TRAINING FLIGHT. THE ACCIDENT SITE WAS DISCOVERED BY THE PILOT OF ANOTHER AIRPLANE WHO REPORTED IT TO ATC. EXAMINATION OF THE WRECKAGE DISCLOSED NO DEFECTS WITH EITHER THE AIRFRAME OR POWERPLANT THAT WOULD ADVERSELY AFFECT AIRCRAFT PERFORMANCE THROUGHOUT ITS APPROVED FLIGHT ENVELOPE. TOXICOLOGICAL TESTING OF THE STUDENT PILOT REVEALED A METABOLITE OF MARIJUANA PRESENT IN THE SUBJECTS URINE AT A CONCENTRATION OF 179NG/ML.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

LOSS OF CONTROL IN FLIGHT, EITHER BY THE STUDENT OR BY THE INSTRUCTOR, AT AN ALTITUDE INSUFFICIENT TO ALLOW FOR A RECOVERY, BY THE FLIGHT INSTRUCTOR, BEFORE THE RESULTING OUT OF CONTROL DESCENT CAUSED THE ACCIDENT AIRPLANE TO STRIKE THE TERRAIN.

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