Landed without clearance.

Attributes
ACN	167735
Time
Date	199101
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : pit
State Reference	PA
Altitude	agl bound lower : 300 agl bound upper : 300
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tower : pit
Operator	common carrier : air carrier
Make Model Name	Medium Transport, High Wing, 2 Turboprop Eng
Flight Phase	descent : approach landing other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : instrument pilot : flight engineer pilot : commercial
Experience	flight time last 90 days : 150 flight time total : 4300 flight time type : 200
ASRS Report	167735
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : less severe incursion : landing without clearance non adherence : clearance non adherence : far
Independent Detector	other flight crewa
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

The aircraft was landed at pit west/O a technical landing clearance. After ground control was contacted, the aircraft was taxied contrary to given instructions. The following details summarize the event leading to the incident: the captain was the PF. The GPWS system in the aircraft faulted while on our final approach. The GPWS gave continuous and erroneous oral commands to 'pull up!,' 'terrain,' and 'G/south.' the aircraft was properly configured for the landing phase of flight. The aircraft was on target airspeed and on G/D the GPWS would not reset to normal when the GPWS test/reset button was activated.

Original NASA ASRS Text

Title: LANDED WITHOUT CLRNC.

Narrative: THE ACFT WAS LANDED AT PIT W/O A TECHNICAL LNDG CLRNC. AFTER GND CTL WAS CONTACTED, THE ACFT WAS TAXIED CONTRARY TO GIVEN INSTRUCTIONS. THE FOLLOWING DETAILS SUMMARIZE THE EVENT LEADING TO THE INCIDENT: THE CAPT WAS THE PF. THE GPWS SYS IN THE ACFT FAULTED WHILE ON OUR FINAL APCH. THE GPWS GAVE CONTINUOUS AND ERRONEOUS ORAL COMMANDS TO 'PULL UP!,' 'TERRAIN,' AND 'G/S.' THE ACFT WAS PROPERLY CONFIGURED FOR THE LNDG PHASE OF FLT. THE ACFT WAS ON TARGET AIRSPD AND ON G/D THE GPWS WOULD NOT RESET TO NORMAL WHEN THE GPWS TEST/RESET BUTTON WAS ACTIVATED.

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.