NTSB Identification: LAX87MA018.
The docket is stored on NTSB microfiche number 31785.
Accident occurred Thursday, October 16, 1986 in ALTADENA, CA
Probable Cause Approval Date: 09/09/1988
Aircraft: CESSNA 172N, registration: N1048F
Injuries: 2 Fatal.

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

WHILE RTRNG TO SANTA MONICA (SMO) FM A X-COUNTRY, THE PLTS DIVERTED TO VAN NUYS WHEN THE RWY AT SMO WAS CLOSED DUE TO A DISABLED ACFT. AFTER THE RWY WAS REOPENED, THEY FILED AN IFR FLT PLN TO CONT AT 5000' & TKOF AT NGT. DRG DEP, THE AR-3 CTLR PROVIDED RADAR VECTORS (FOR CLNC AT 3000'). AT 1926:39, AR-4 CTLR ACKNOWLEDGED/ACCEPTED AN AUTOMATED HANDOFF VIA AN ARTS-III COMPUTER KEYBOARD ENTRY. AR-3 PROVIDED ADNTL VECTORS TO THE FLT, THE LAST BEING A 080 DEG HDG (AT 1929:12), BUT DIDN'T TELL THE PLTS TO CHG TO AR-4'S FREQ. AT APRX 1933, THE AR-3 & AR-4 CTLRS WERE RELIEVED & BGN BRIEFING THEIR RELIEVING CTLRS. SOON THEREAFTER, THE FLT PASSED OVR THE ASR ANTENNA, THEN WAS DISPLAYED ON THE RADAR SCOPE IN A COAST MODE. IT REAPPEARED WITH A DATA TAG, THAT ERRONEOUSLY INDCD ANOTHER FACILITY HAD CTL OF THE FLT. THE RELIEVING CTLRS SAWTHE FULL DATA BLOCK ON THEIR SCOPES, BUT DISREGARDED IT, DUE TO THE ERRONEOUS CTL SYMBOL. SUBSEQUENTLY, THE ACFT HIT MTNS AT THE LAST ASSIGNED ALT OF 3000'. THE CFI HAD JUST MOVED FM FL TO CA & WAS ON HIS 2ND DAY OF EMPLOYMENT IN CA.

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

CREW/GROUP BRIEFING..INADEQUATE..ATC PERSONNEL(DEP/APCH)

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

IDENTIFICATION OF AIRCRAFT ON RADAR..NOT MAINTAINED..ATC PERSONNEL(DEP/APCH)

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

ATC CLEARANCE..IMPROPER..ATC PERSONNEL(DEP/APCH)

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

ALTITUDE..INADEQUATE


Contributing Factors

LIGHT CONDITION..DARK NIGHT


Contributing Factors

WEATHER CONDITION..LOW CEILING


Contributing Factors

TERRAIN CONDITION..MOUNTAINOUS/HILLY


Contributing Factors

HABIT INTERFERENCE..ATC PERSONNEL(DEP/APCH)

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