NTSB Identification: DCA85IA003B.
The docket is stored on NTSB microfiche number 30172.
Incident occurred Thursday, October 18, 1984 in SEATTLE, WA
Aircraft: MOONEY M20C, registration: N6507U
Injuries: 50 Uninjured.

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

DURING ARRIVAL, A BOEING VC-137B-BN, USAF #58-6970, OPERATING AS AIR FORCE 2 (AF-2), WAS CLEARED FOR A LOCALIZER BACK- COURSE APCH. AT 1442:49, TRACON ADVISED AF-2 OF TRAFFIC AT ITS 10 O'CLOCK POSITION AT 2 MI, ALT UNKN. AT 1443:11, TRACON ADVISED AF-2 THE TRAFFIC HAD MOVED TO ITS 11 O-CLOCK POSITION AT 1-1/2 MI. AF-2 ACKNOWLEDGED BOTH TRANSMISSIONS. AT 1443:29, AF-2 ADVISED THAT THE FLT WAS CHANGING ITS FREQ TO BOEING TOWER. SHORTLY THEREAFTER, THE ACFT CMDR OF AF-2, SEATED IN THE RIGHT, SAW THE TRAFFIC, A MOONEY M20C, N6507U, ON A COLLISION COURSE. HE TOOK CONTROL & INITIATED EVASIVE ACTION. THE PLT OF N6507U WAS CRUISING AT 2,500 FT OUTSIDE THE SEATTLE TCA & DID NOT SEE AF-2, WHICH HAD CONVERGED FROM HIS RIGHT REAR AREA. THE MOONEY'S #1 RADIO WAS INOP & ITS #2 RADIO ANTENNA HAD BEEN VANDALIZED, THUS THE PLT WAS NOT IN RADIO CONTACT WITH ATC. THE LAST DIGIT/WHEEL ON HIS TRANSPONDER WAS STUCK ON '5' & CODE 1205 WAS BEING TRANSMITTED. THE TRANSPONDER HAD NO MODE 'C' ALT REPORTING CAPABILITY. ALL OF THE BACKCOURSE APCH WAS OUTSIDE THE TCA.

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

VISUAL LOOKOUT..DELAYED..PILOT OF OTHER AIRCRAFT


Contributing Factors

COMM/NAV EQUIPMENT,TRANSMITTER..INOPERATIVE


Contributing Factors

COMM/NAV EQUIPMENT,RECEIVER..INOPERATIVE


Contributing Factors

COMMUNICATIONS..NOT POSSIBLE..PILOT IN COMMAND

Index for Oct1984 | Index of months