Air carrier medium large transport says they lost radio contact with pit approach, but could hear other aircraft on frequency so changed to tower. After landing they were advised they had caused a traffic conflict and that the approach controller was trying to call them.

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Attributes
ACN	171699
Time
Date	199102
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : pit
State Reference	PA
Altitude	msl bound lower : 7000 msl bound upper : 7000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : pit tower : pit
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	descent : approach descent other landing other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 195 flight time total : 16500 flight time type : 3500
ASRS Report	171699
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation other anomaly other
Independent Detector	other controllera
Resolutory Action	none taken : unable
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

After being cleared for ILS approach, at some time we lost communication with approach control. At approximately 4 mi under the impression that everything was normal (we had been hearing other communication on the frequency), we called and asked if we should 'go tower frequency.' getting no answer, we switched to tower, received landing clearance and landed. We were then informed there had been a traffic conflict and that numerous calls had been made to us to no avail. Our radio checked ok. Suspect controller was transmitting on wrong frequency or not at all.

Original NASA ASRS Text

Title: ACR MLG SAYS THEY LOST RADIO CONTACT WITH PIT APCH, BUT COULD HEAR OTHER ACFT ON FREQ SO CHANGED TO TWR. AFTER LNDG THEY WERE ADVISED THEY HAD CAUSED A TRAFFIC CONFLICT AND THAT THE APCH CTLR WAS TRYING TO CALL THEM.

Narrative: AFTER BEING CLRED FOR ILS APCH, AT SOME TIME WE LOST COM WITH APCH CTL. AT APPROX 4 MI UNDER THE IMPRESSION THAT EVERYTHING WAS NORMAL (WE HAD BEEN HEARING OTHER COM ON THE FREQ), WE CALLED AND ASKED IF WE SHOULD 'GO TWR FREQ.' GETTING NO ANSWER, WE SWITCHED TO TWR, RECEIVED LNDG CLRNC AND LANDED. WE WERE THEN INFORMED THERE HAD BEEN A TFC CONFLICT AND THAT NUMEROUS CALLS HAD BEEN MADE TO US TO NO AVAIL. OUR RADIO CHKED OK. SUSPECT CTLR WAS XMITTING ON WRONG FREQ OR NOT AT ALL.

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.