NTSB Identification: LAX87LA105.
The docket is stored on NTSB microfiche number 33701.
Accident occurred Saturday, January 31, 1987 in LOS ANGELES, CA
Probable Cause Approval Date: 07/05/1988
Aircraft: SIKORSKY S-58B, registration: N5594C
Injuries: 1 Minor,1 Uninjured.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

A SIKORSKY S-58B COLLIDED WITH A MARKED 253 FT AGL ANTENNA TOWER (TWR) WHILE MANEUVERING OVER EXTERNAL LOAD LIFT SITE. THE PLT INDICATED THAT HE WAS SITTING IN THE RIGHT SEAT OF THE ACFT IN A RIGHT DESCENDING ORBIT CONDUCTING A SITE RECON AND THAT HE WAS AWARE OF THE TWRS PRESENCE. THE PLT STATED THAT HE MISJUDGED HIS POSITION RE THE TWR. THE PLT INDICATED THAT HE STARTED A DESCENT WHILE DISCUSSING THE LIFT PLAN WITH HIS CREWCHIEF. BOTH CREWMEMBERS WHO WERE ON THE RIGHT SIDE OF THE ACFT WERE LOOKING TO THE RIGHT AT THE LIFT SITE WHEN THE HELICOPTER STRUCK THE ANTENNA TWR. THE ANTENNA TWR WAS A PROPERLY MARKED OBSTRUCTION AND MET THE LIGHTING REQUIREMENTS IN ACCORDANCE WITH FAA ADVISORY CIRCULAR 70/7460-1. THE COLLISION DAMAGED THE MAIN ROTOR.

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

DESCENT..PREMATURE..PILOT IN COMMAND

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

VISUAL LOOKOUT..NOT MAINTAINED..PILOT IN COMMAND

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

DIVERTED ATTENTION..PILOT IN COMMAND


Contributing Factors

OBJECT..ELECTRICAL TOWER(MARKED)




Contributing Factors

PLANNED APPROACH..POOR..PILOT IN COMMAND


Contributing Factors

CREW/GROUP COORDINATION..POOR..PILOT IN COMMAND

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