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Flight crew of large transport instructed to keep FAA NAVAID inspection aircraft in sight. Lost sight of aircraft and saw him pass under nose several hundred ft below.
| Attributes | |
| ACN | 199086 |
| Time | |
| Date | 199201 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : adw |
| State Reference | MD |
| Altitude | msl bound lower : 1500 msl bound upper : 1500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : adw |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | descent : approach descent other landing other |
| Route In Use | approach : visual arrival other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | other |
| Make Model Name | Small Transport, Low Wing, 2 Turboprop Eng |
| Navigation In Use | Other Other |
| Flight Phase | descent : approach descent other other |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : commercial pilot : instrument |
| Experience | flight time last 90 days : 85 flight time total : 10830 |
| ASRS Report | 199086 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe |
| Independent Detector | other flight crewa |
| Resolutory Action | other |
| Consequence | Other |
| Miss Distance | horizontal : 0 vertical : 500 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Approaching andrews air force base in visual conditions an small transport on a flight check of the ILS to runway 19R was reported to us for visual contact. After locating the small transport we reported it and the field in sight for a visual approach. The clearance for visual approach to runway 19R was issued with the requirement to keep the small transport who was below us, in sight. The small transport was on a different radio frequency and we were concerned regards his intentions as we were nearly matched in speed and location on approach to the same runway. After some discussion with the tower we determined that the small transport was to turn off the localizer 1.5 mi inside the marker. During this conversation we lost sight of the small transport under our nose and shortly afterwards saw him in a left turn only a few hundred ft below us. It was our responsibility to keep the small transport in sight but lost him due to close proximity and other cockpit workload. However, the situation was precipitated by the apparent insistence of the small transport to continue the flight check with other arriving aircraft on the approach and the clearance from the tower to 2 different aircraft to be in the same airspace at the same time. In retrospect, I should have more significantly modified my approach to maintain a larger visual separation.
Original NASA ASRS Text
Title: FLC OF LGT INSTRUCTED TO KEEP FAA NAVAID INSPECTION ACFT IN SIGHT. LOST SIGHT OF ACFT AND SAW HIM PASS UNDER NOSE SEVERAL HUNDRED FT BELOW.
Narrative: APCHING ANDREWS AIR FORCE BASE IN VISUAL CONDITIONS AN SMT ON A FLT CHK OF THE ILS TO RWY 19R WAS RPTED TO US FOR VISUAL CONTACT. AFTER LOCATING THE SMT WE RPTED IT AND THE FIELD IN SIGHT FOR A VISUAL APCH. THE CLRNC FOR VISUAL APCH TO RWY 19R WAS ISSUED WITH THE REQUIREMENT TO KEEP THE SMT WHO WAS BELOW US, IN SIGHT. THE SMT WAS ON A DIFFERENT RADIO FREQ AND WE WERE CONCERNED REGARDS HIS INTENTIONS AS WE WERE NEARLY MATCHED IN SPD AND LOCATION ON APCH TO THE SAME RWY. AFTER SOME DISCUSSION WITH THE TWR WE DETERMINED THAT THE SMT WAS TO TURN OFF THE LOC 1.5 MI INSIDE THE MARKER. DURING THIS CONVERSATION WE LOST SIGHT OF THE SMT UNDER OUR NOSE AND SHORTLY AFTERWARDS SAW HIM IN A L TURN ONLY A FEW HUNDRED FT BELOW US. IT WAS OUR RESPONSIBILITY TO KEEP THE SMT IN SIGHT BUT LOST HIM DUE TO CLOSE PROX AND OTHER COCKPIT WORKLOAD. HOWEVER, THE SITUATION WAS PRECIPITATED BY THE APPARENT INSISTENCE OF THE SMT TO CONTINUE THE FLT CHK WITH OTHER ARRIVING ACFT ON THE APCH AND THE CLRNC FROM THE TWR TO 2 DIFFERENT ACFT TO BE IN THE SAME AIRSPACE AT THE SAME TIME. IN RETROSPECT, I SHOULD HAVE MORE SIGNIFICANTLY MODIFIED MY APCH TO MAINTAIN A LARGER VISUAL SEPARATION.
Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.