NTSB Identification: DEN86FA023.
The docket is stored on NTSB microfiche number 30394.
Accident occurred Friday, November 15, 1985 in ALBUQUERQUE, NM
Aircraft: BEECH A45, registration: N422NM
Injuries: 2 Serious.

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.

WHILE MANEUVERING TO ENTER TRAFFIC AT ALAMEDA ARPT, THE PLT EXPERIENCED SEVERE ACFT VIBRATIONS. HE ATTEMPTED BUT WAS NOT ABLE TO REACH THE ARPT DUE TO RAPID LOSS OF AIRSPEED ANDALTITUDE. THE ACFT CRASHED 1/2 MILE FROM THE LANDING RWY. THE ONE PAX AND A WITNESS INDICATED THAT THE ACFT STALLED 20-30 FT AGL. THE INVESTIGATION REVEALED A FRACTURED PROPELLERPITCH ACTUATING PIN WHICH WAS CAUSED BY A RECENT IMPROPER OVERHAUL. THE HOLE IN WHICH THE PIN WAS INSTALLED WAS IMPROPERLY DRILLED, ALLOWING THE PIN TO BOTTOM OUT BEFORE TORQUE COULD BE APPLIED TO THE SHAFT. EXAMINATION OF THE FRACTURED SURFACES BY METALLURGIAL LABORATORY ANALYSIS REVEALED A PROGRESSIVE TYPE OF FAILURE.

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

PROPELLER SYSTEM/ACCESSORIES,PITCH CHANGE MECH..FAILURE,PARTIAL

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

PROPELLER SYSTEM/ACCESSORIES..VIBRATION

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

MAINTENANCE,OVERHAUL..IMPROPER..OTHER MAINTENANCE PERSONNEL


Contributing Factors

STALL..INADVERTENT..PILOT IN COMMAND


Contributing Factors

AIRSPEED..NOT MAINTAINED..PILOT IN COMMAND

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