SANSA Flight 32

SANSA Flight 32 was a flight from Juan Santamaría International Airport to Palmar Sur Airport. On January 15, 1990, the CASA C-212 Aviocar (registered TI-SAB) that was doing the flight crashed into a mountain after takeoff. All 20 passengers and 3 crew members on board died.
Aircraft.
The incident aircraft, TI-SAB, was an CASA C-212 Aviocar which flew for Sansa Airlines.
Flight.
The aircraft took off at 8:25 a.m. CST. Air traffic control had the plane fly to 5500 ft (1676 m). After this, air traffic control had the plane fly to 8500 ft (2600 m). While flying at 7200 ft (2200 m), the plane crashed into a mountain, killing all on board. 
Afterward.
After looking into the accident, the reason for the crash was because the pilots did not follow the flight plan agreed to with air traffic control. The plane did not have a GPWS.