<< >> NASA ASRS Report 376360, August 1997

A DC8 crew is stopped from further descent during approach by the controller at quito due to their proximity to another aircraft. That aircraft, another DC8 freighter, was lost on the radar by approach controller who failed to prevent the potential conflict. Neither aircraft was equipped with TCASII.

Attributes
ACN	376360
Time
Date	199708
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : uio airport : sequ
State Reference	FO
Altitude	msl bound lower : 16000 msl bound upper : 17000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : sequ
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	descent : approach descent other other
Route In Use	enroute other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	DC-8 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach descent other
Route In Use	enroute other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 240 flight time total : 32750 flight time type : 7000
ASRS Report	376360
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation other anomaly other
Independent Detector	other flight crewa
Resolutory Action	controller : issued new clearance flight crew : exited adverse environment other
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 4500 vertical : 300
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

After commencing VOR qit ILS runway 35 approach and leaving qit VOR 17000 ft for 13200 ft, at 16000 ft told by ATC to maintain 17000 ft. At this time noticed a DC8 above and to our right. We were approximately 4 DME past the VOR at this time. We talked to ATC in quito. They said 'we lost radar on aircraft Y,' but gave us no warning of aircraft or no instructions to hold 17000 ft prior to the start of the approach. Need english understanding controllers.

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Original NASA ASRS Text

Title: A DC8 CREW IS STOPPED FROM FURTHER DSCNT DURING APCH BY THE CTLR AT QUITO DUE TO THEIR PROX TO ANOTHER ACFT. THAT ACFT, ANOTHER DC8 FREIGHTER, WAS LOST ON THE RADAR BY APCH CTLR WHO FAILED TO PREVENT THE POTENTIAL CONFLICT. NEITHER ACFT WAS EQUIPPED WITH TCASII.

Narrative: AFTER COMMENCING VOR QIT ILS RWY 35 APCH AND LEAVING QIT VOR 17000 FT FOR 13200 FT, AT 16000 FT TOLD BY ATC TO MAINTAIN 17000 FT. AT THIS TIME NOTICED A DC8 ABOVE AND TO OUR R. WE WERE APPROX 4 DME PAST THE VOR AT THIS TIME. WE TALKED TO ATC IN QUITO. THEY SAID 'WE LOST RADAR ON ACFT Y,' BUT GAVE US NO WARNING OF ACFT OR NO INSTRUCTIONS TO HOLD 17000 FT PRIOR TO THE START OF THE APCH. NEED ENGLISH UNDERSTANDING CTLRS.

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.