Individually Owned: 150,657
Corporate Owned: 137,281
Aircraft Accident/Incident Report
Anchorage, Alaska 99519
Thursday, October 8, 1992 9:39 AKD
NTSB Narrative Summary Released at Completion of Accident
THE DHC-8, N680MA, WAS NORTH BOUND IN RADAR CONTROL APRX 8 NM FROM ANC INTL ARPT, AND WAS PROVIDED VISUAL SEPARATION FROM THE B-737, N673MA, NE BOUND ON APCH TO ELMENDORF AFB. THE B-737 WAS IN CLOUDS AT THE TIME OF THE ADVISORY, AND THE DHC-8 MISTOOK ANOTHER B-737 FOR VISUAL SEPARATION. THE TCAS ALERTED THE FIRST B-737 PILOT OF CLOSE PROXIMITY OF TRAFFIC APPROACHING AT AT HIS 2 O'CLOCK POSITION, AND HE INITIATED A CLIMB IN IMC. A RAPID DESCENT WAS INITIATED BY THE DHC-8 PILOT AFTER SEEING THE B-737 EMERGING FROM THE CLOUDS. THESE EVASIVE ACTIONS OCCURRED APPROXIMATELY 20 SECS PRIOR TO THE CROSSING OF THE TRACKS OF THE TWO AIRPLANES. ATC CONTROL OF THE CONFLICTING AIRPLANES WAS BY THE SAME POSITION CONTROLLER ON SEPARATE FREQUENCIES. THE B-737 PILOT WAS NOT ADVISED NOR AWARE OF THE DHC-8 BEING PROVIDING VISUAL SEPARATION FROM HIS AIRPLANE PER FAA ORDER 7110.65G UNTIL THE TCAS PULL-UP AND VISUAL SIGHTING OF THE TRAFFIC PASSING UNDER AND IN FRONT.
NTSB Probable Cause Narrative
IMPROPER ATC CLEARANCE INSTRUCTIONS BY THE APPROACH CONTROLLER, RESULTING IN A FAILURE TO INSURE SAFE SEPARATION BETWEEN AN AIRPLANE IN VISUAL CONDITIONS WITH AN AIRPLANE IN INSTRUMENT METEOROLOGICAL CONDITIONS ON CONVERGING COURSES. A FACTOR WHICH CONTRIBUTED WAS INSUFFICIENT INFORMATION PROVIDED TO BOTH PILOTS BY THE CONTROLLER.
Event Information
| Type of Event | Incident |
| Event Date | 10/8/1992 |
| Event Day of the Week | Thursday |
| Time of Event | 939 |
| Event Time Zone | -- |
| Event City | ANCHORAGE |
| Event State | ALASKA |
| Event Country | -- |
| Zipcode of the event site | 99519 |
| Event Date Year | 1992 |
| Event Date Month | 10 |
| MidAir Collision Indicator | -- |
| On Ground Collision occurred ? | -- |
| Event Location Latitude | |
| Event Location Longitude | |
| Event Location Airport | |
| Event Location Nearest Airport ID | |
| Indicates whether the acc/inc occurred off or on an airport | Off Airport/Airstrip |
| Distance from airport in statute miles | 0 |
| Degrees magnetic from airport | 0 |
| Airport Elevation | -- |
| Weather Briefing Completeness | Unknown |
| Investigator's weather source | Weather Observation Facility |
| Time of the weather observation | 900 Atlantic Daylight Time |
| Direction of event from weather observation facility (degrees) | 245 |
| Weather Observation Facility ID | ANC |
| Elevation of weather observation facility | 144 |
| Distance of event from weather observation facility (units?) | 4 |
| Time Zone of the weather observation | ADT |
| Lighting Conditions | Day |
| Lowest Ceiling Height | 2800 |
| Lowest Non-Ceiling Height | 0 |
| Sky/Lowest/Cloud Conditions | Unknown |
| Sky Condition for Lowest Ceiling | Broken |
| Visibility Runway Visual Range (Feet) | 0 |
| Visibility Runway Visual Value (Statute Miles) | 0 |
| Visibility (Statute Miles) | 0 |
| Air Temperature at event time (in degrees celsius) | 4 |
| Dew Point at event time (in degress fahrenheit) | 0 |
| Wind Direction (degrees magnetic) | 170 |
| Variable Wind Indicator | Unknown |
| Wind Speed (knots) | 11 |
| Wind Velocity Indicator | Unknown |
| Wind Gust Indicator | Unknown |
| Wind Gust (knots) | 0 |
| Altimeter Setting at event time (in. Hg) | 29 |
| Density Altitude (feet) | -- |
| Intensity of Precipitation | Unknown |
| METAR weather report | -- |
| Event Highest Injury | None |
| On Ground, Fatal Injuries | 0 |
| On Ground, Minor Injuries | 0 |
| On Ground, Serious Injuries | 0 |
| Injury Total Fatal | -- |
| Injury Total Minor | -- |
| Injury Total None | 26 |
| Injury Total Serious | -- |
| Injury Total All | -- |
| Investigating Agency | NTSB |
| NTSB Docket Number (internal use) | 5045 |
| NTSB Notification Source | -- |
| NTSB Notification Date | Oct 8 1992 12:00AM |
| NTSB Notification Time | 1730 |
| Fiche Number and/or location -used to find docket information | 50042 |
| Date of most recent change to record | Apr 9 2001 10:27AM |
| User who most recently changed record | dbo |
| Basic weather conditions | Visual Meteorological Cond |
| FAA District Office | -- |
Aircraft Involved |
||
|---|---|---|
Aircraft #1 |
Aircraft #2 |
|
| Aircraft Registration Number | N673MA | N680MA |
| NTSB Number | ANC93IA007A | ANC93IA007B |
| Missing Aircraft Indicator | N | N |
| Federal Aviation Reg. Part | Part 121: Air Carrier | Part 121: Air Carrier |
| Type of Flight Plan filed | IFR | IFR |
| Flight plan Was Activated? | -- | -- |
| Damage | None | None |
| Aircraft Fire | None | None |
| Aircraft Explosion | None | None |
| Aircraft Manufacturer's Full Name | BOEING | DE HAVILLAND |
| Aircraft Model | 737-200 | DHC-8 |
| Aircraft Series Identifier | 737-200 | DHC-8 |
| Aircraft Serial Number | ||
| Certified Max Gross Weight | 103500 | 30500 |
| Aircraft Category | Airplane | Airplane |
| Aircraft Registration Class | U.S. Registered/U.S. Soil | U.S. Registered/U.S. Soil |
| Aircraft is a homebuilt? | No | No |
| Flight Crew Seats | -- | -- |
| Cabin Crew Seats | -- | -- |
| Passenger Seats | -- | -- |
| Total number of seats on the aircraft | -- | -- |
| Number of Engines | 2 | 2 |
| Fixed gear or retractable gear | Retractable | Retractable |
| Aircraft, Type of Last Inspection | AAIP | AAIP |
| Date of Last Inspection | Jan 2 1900 12:00AM | Jan 2 1900 12:00AM |
| Airframe hours since last inspection | -- | -- |
| Airframe Hours | -- | -- |
| ELT Installed | Yes | Yes |
| ELT Activated | No | No |
| ELT Aided Location of Event Site | No | No |
| ELT Type | -- | -- |
| Aircraft Owner Name | MARK AIR, INC | MARK AIR INC. |
| Aircraft Owner Street Address | P. O. BOX 196679 | 4100 WEST INTERNATIONAL ARPT |
| Aircraft Owner City | ANCHORAGE | ANCHORAGE |
| Aircraft Owner State | AK | AK |
| Aircraft Owner Country | ||
| Aircraft Owner Zipcode | 99519 | 99519 |
| Operator is an individual? | -- | -- |
| Operator Name | MARK AIR, INC | MARK AIR INC. |
| Operator Same as Owner? | Yes | Yes |
| Operator Is Doing Business As | -- | -- |
| Operator Address Same as Owner? | No | Yes |
| Operator Street Address | P.O. BOX 196769 | 4100 WEST INTERNATIONAL ARPT |
| Operator City | ANCHORAGE | ANCHORAGE |
| Operator State | AK | AK |
| Operator Country | ||
| Operator Zip code | 99519 | 99519 |
| Operator Code | MRKA | HERA |
| Owner has at least one certificate | Yes - certificate holder | Yes - certificate holder |
| Other Operator of large aircraft? | No | No |
| Certified for Part 133 or 137 Operation | Unknown | Unknown |
| Operator Certificate Number | -- | -- |
| Indicates whether an air carrier operation was scheduled or not | Scheduled | Scheduled |
| Indicates Domestic or International Flight | Domestic | Domestic |
| Operator carrying Pax/Cargo/Mail | Passenger/Cargo | Passenger/Cargo |
| Type of Flying (Per_Bus / Primary) | Unknown | Unknown |
| Second Pilot on Board | Yes | Yes |
| Departure Point Same as Event | No | No |
| Departure Airport Code | AKN | ADQ |
| Departure City | KING SALMON | KODIAK |
| Departure State | AK | AK |
| Departure Country | ||
| Departure Time | 820 | 820 |
| Departure Time Zone | ADT | ADT |
| Destination Same as Local Flt | -- | crash at destination city |
| Destination Airport Code | EDF | |
| Destination City | ELMENDORF AFB | |
| Destination State | AK | |
| Destination Country | ||
| Specific Phase of Flight | Approach | Approach |
| Report sent to ICAO? | -- | -- |
| Evacuation occurred | -- | -- |
| Date of most recent change to record | Jan 2 2001 10:30AM | Jan 2 2001 10:30AM |
| User who most recently changed record | dbo | dbo |
| Since inspection or accident | -- | -- |
| Event Location Runway Number and Location | 0 | 0 |
| Runway Length | -- | -- |
| Runway Width | -- | -- |
| Sight Seeing flight | No | No |
| Air Medical Flight | No | No |
| Medical Flight | -- | -- |