<< >> NASA ASRS Report 138664, March 1990

Other unidentified aircraft in proximity of air carrier large transport by passenger during air hold and approach to a non tower airport with unicom.

Attributes
ACN	138664
Time
Date	199003
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : che airport : hdn
State Reference	CO
Altitude	msl bound lower : 14000 msl bound upper : 14000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdv
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	cruise other descent : approach other
Route In Use	arrival other
Flight Plan	IFR
Aircraft 2
Operator	general aviation : corporate
Make Model Name	Light Transport
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 14000
ASRS Report	138664
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 non adherence other
Independent Detector	other other : unspecified
Resolutory Action	none taken : detected after the fact
Consequence	Other
Miss Distance	horizontal : 6000 vertical : 500
Supplementary
Primary Problem	Ambiguous
Air Traffic Incident	other

Narrative:

Holding at che for clearance for approach to hayden airport. Briefed for runway 10 ILS and were cleared for the approach by ZDV. Left holding pattern for approach to runway 10. Electronic displays did not look right as we started outbnd. Requested clearance from ZDV to return to che and hold at 14000' in order to rechk approach plate and CRT display. Reclred out of holding for approach to runway 10. CRT and approach plates checked ok. Normal approach and landing. After arrival at gate agent told me a passenger saw another aircraft, possibly a business jet. He tried to locate the passenger but he had left. By not being able to talk to the passenger I don't now what phase of the flight, how close or even which side the sighting may have been on. During the approach we did not hear any traffic on unicom and company traffic advisories were clear.

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Original NASA ASRS Text

Title: OTHER UNIDENTIFIED ACFT IN PROX OF ACR LGT BY PASSENGER DURING AIR HOLD AND APCH TO A NON TWR ARPT WITH UNICOM.

Narrative: HOLDING AT CHE FOR CLRNC FOR APCH TO HAYDEN ARPT. BRIEFED FOR RWY 10 ILS AND WERE CLRED FOR THE APCH BY ZDV. LEFT HOLDING PATTERN FOR APCH TO RWY 10. ELECTRONIC DISPLAYS DID NOT LOOK RIGHT AS WE STARTED OUTBND. REQUESTED CLRNC FROM ZDV TO RETURN TO CHE AND HOLD AT 14000' IN ORDER TO RECHK APCH PLATE AND CRT DISPLAY. RECLRED OUT OF HOLDING FOR APCH TO RWY 10. CRT AND APCH PLATES CHKED OK. NORMAL APCH AND LNDG. AFTER ARR AT GATE AGENT TOLD ME A PAX SAW ANOTHER ACFT, POSSIBLY A BUSINESS JET. HE TRIED TO LOCATE THE PAX BUT HE HAD LEFT. BY NOT BEING ABLE TO TALK TO THE PAX I DON'T NOW WHAT PHASE OF THE FLT, HOW CLOSE OR EVEN WHICH SIDE THE SIGHTING MAY HAVE BEEN ON. DURING THE APCH WE DID NOT HEAR ANY TFC ON UNICOM AND COMPANY TFC ADVISORIES WERE CLR.

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.