NTSB Identification: DCA87MA030.
The docket is stored on NTSB microfiche number 35870.
Scheduled 14 CFR
Accident occurred Friday, May 08, 1987 in MAYAGUEZ
Probable Cause Approval Date: 06/07/1989
Aircraft: CASA C-212-CC, registration: N432CA
Injuries: 2 Fatal,4 Minor.

NTSB investigators traveled in support of this investigation and used data obtained from various sources to prepare this aircraft accident report.

AFTER SEVERAL MAINTENANCE ADJUSTMENTS OF THE RIGHT PROPELLER AND FLIGHT IDLE FUEL FLOW, THE AIRCRAFT WAS TEST FLOWN AND RELEASED FOR FLIGHT. SEVERAL PILOTS CONTINUED TO NOTE DESCREPANCIES CONCERNING THE RIGHT PROPELLER SYSTEM. ADJUSTMENTS WERE MADE AND THE AIRCRAFT WAS AGAIN RELEASED FOR FLIGHT. AT MAYAGUEZ, THE CREW MADE A SHORT, STEEP APPROACHTO THE RUNWAY. ON VERY SHORT FINAL WITNESSES SAID THEY HEARD SOUNDS RESEMBLING A PROPELLER IN REVERSE THRUST. THE AIRCRAFT MADE AN EXTREME YAW TO THE RIGHT, FOLLOWED BY A LEFT BANK, THEN A RIGHT BANK. THE AIRCRAFT IMPACTED RIGHT WING FIRST. THE POST-ACCIDENT INVESTIGATION REVEALED THAT THE RIGHT PROPELLER HAD BEEN IN THE BETA RANGE. THE RIGHT ENGINE FLIGHT IDLE FUEL FLOW WAS EXCESSIVELY HIGH. EXAM OF THE MAINTENANCE PROGRAM SHOWED DEFICIENCIES IN THE MANAGEMENT, SUPERVISION, AND HANDLING OF PILOT-REPORTED PROBLEMS. THE INVESTIGATION ALSO FOUND THE FAA MANAGEMENT OF THE BILATERAL TYPE CERTIFICATION OF THE C-212-CC INEFFECTIVE. (FOR FURTHER INFORMATION SEE NTSB/AAR-88/07.)

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

PROPELLER SYSTEM/ACCESSORIES..ASYMMETRICAL

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

FUEL SYSTEM,FUEL CONTROL

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

MAINTENANCE,ADJUSTMENT..IMPROPER..COMPANY MAINTENANCE PERSONNEL


Contributing Factors

PROPER DESCENT RATE..NOT MAINTAINED..PILOT IN COMMAND





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