B757 crew lands at ZZZZ without clearance.

Attributes
ACN	708678
Time
Date	200608
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : zzzz.airport
State Reference	FO
Altitude	msl single value : 5000
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : zzzz.tracon
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	descent : approach
Route In Use	approach : straight in
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : zzzz.tracon
Operator	common carrier : air carrier
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : relief pilot
ASRS Report	708678
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
ASRS Report	708010
Events
Anomaly	conflict : airborne less severe incursion : landing without clearance
Independent Detector	other flight crewa
Resolutory Action	none taken : anomaly accepted
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	ATC Human Performance

Narrative:

On approach to ZZZZ and told we were to descend to 5000 ft to ZZZZ for straight in approach and we were #1. Then heard another air carrier was told to descend to 3000 ft and told straight to ZZZZ for straight in approach and #1. We were 25 NM from ZZZZ and other air carrier 30 NM. Captain explained to approach that we were both given same clearance and we were closer. We could see airplane on TCAS and collision course obvious to us. Approach then stopped other air carrier at 5000 ft and cleared us for approach to land #1. Then we had difficulty contacting approach; radio was silent with captain calling. Also tried on tower frequency and no luck. As we were unsure of the direction of other air carrier we continued approach and captain used emergency authority/authorized to land without a clearance as this seemed the safe course of action with the other air carrier overhead the airport. Contact was made at touchdown with approach. They were only frequency working for approach; tower and ground at this time. No mention was made by approach of the radio silence when landing clearance was repeatedly requested or the landing without a clearance. They cleared us to taxi to gate. Supplemental information from acn 708010: going around was not an option; because we did not know where air carrier Y was; in a non-radar environment; at 5000 ft at ZZZZ; which is at the airport.

Original NASA ASRS Text

Title: B757 CREW LANDS AT ZZZZ WITHOUT CLRNC.

Narrative: ON APCH TO ZZZZ AND TOLD WE WERE TO DSND TO 5000 FT TO ZZZZ FOR STRAIGHT IN APCH AND WE WERE #1. THEN HEARD ANOTHER ACR WAS TOLD TO DSND TO 3000 FT AND TOLD STRAIGHT TO ZZZZ FOR STRAIGHT IN APCH AND #1. WE WERE 25 NM FROM ZZZZ AND OTHER ACR 30 NM. CAPT EXPLAINED TO APCH THAT WE WERE BOTH GIVEN SAME CLRNC AND WE WERE CLOSER. WE COULD SEE AIRPLANE ON TCAS AND COLLISION COURSE OBVIOUS TO US. APCH THEN STOPPED OTHER ACR AT 5000 FT AND CLRED US FOR APCH TO LAND #1. THEN WE HAD DIFFICULTY CONTACTING APCH; RADIO WAS SILENT WITH CAPT CALLING. ALSO TRIED ON TWR FREQ AND NO LUCK. AS WE WERE UNSURE OF THE DIRECTION OF OTHER ACR WE CONTINUED APCH AND CAPT USED EMER AUTH TO LAND WITHOUT A CLRNC AS THIS SEEMED THE SAFE COURSE OF ACTION WITH THE OTHER ACR OVERHEAD THE ARPT. CONTACT WAS MADE AT TOUCHDOWN WITH APCH. THEY WERE ONLY FREQ WORKING FOR APCH; TWR AND GND AT THIS TIME. NO MENTION WAS MADE BY APCH OF THE RADIO SILENCE WHEN LNDG CLRNC WAS REPEATEDLY REQUESTED OR THE LNDG WITHOUT A CLRNC. THEY CLRED US TO TAXI TO GATE. SUPPLEMENTAL INFO FROM ACN 708010: GOING AROUND WAS NOT AN OPTION; BECAUSE WE DID NOT KNOW WHERE ACR Y WAS; IN A NON-RADAR ENVIRONMENT; AT 5000 FT AT ZZZZ; WHICH IS AT THE ARPT.

Data retrieved from NASA's ASRS site as of January 2009 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.