Air carrier large transport non adherence to ATC clearance and probably unauthorized landing.

Attributes
ACN	156201
Time
Date	199009
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : mso
State Reference	MT
Altitude	msl bound lower : 3201 msl bound upper : 10000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : mso artcc : zob
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	descent other landing other
Route In Use	approach : visual
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : atp pilot : instrument
Experience	flight time last 90 days : 250 flight time total : 7000 flight time type : 5000
ASRS Report	156201
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : private pilot : atp pilot : commercial pilot : flight engineer pilot : instrument
Experience	flight time last 90 days : 230 flight time total : 7000 flight time type : 4100
ASRS Report	156203
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : published procedure non adherence : far non adherence : clearance other spatial deviation
Independent Detector	other controllera other flight crewa
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Descending into mso, ATIS information and approach controller's clearance was for VOR/DME-B. Acquired field approximately 45 DME east. Approximately 20 DME east, informed approach control we had field in sight and proceeding visually, at which time approach issued clearance for VOR C approach and inquired as to altitude. Due to moderate turbulence, close proximity to airport and inability to communication with approach control due to frequency congestion with commuter aircraft, safety course of action was to continue visually to airport. Approach controller seemed confused as to our intentions. Continued to normal, uneventful approach and landing.

Original NASA ASRS Text

Title: ACR LGT NON ADHERENCE TO ATC CLRNC AND PROBABLY UNAUTH LNDG.

Narrative: DSNDING INTO MSO, ATIS INFO AND APCH CTLR'S CLRNC WAS FOR VOR/DME-B. ACQUIRED FIELD APPROX 45 DME E. APPROX 20 DME E, INFORMED APCH CTL WE HAD FIELD IN SIGHT AND PROCEEDING VISUALLY, AT WHICH TIME APCH ISSUED CLRNC FOR VOR C APCH AND INQUIRED AS TO ALT. DUE TO MODERATE TURB, CLOSE PROX TO ARPT AND INABILITY TO COM WITH APCH CTL DUE TO FREQ CONGESTION WITH COMMUTER ACFT, SAFETY COURSE OF ACTION WAS TO CONTINUE VISUALLY TO ARPT. APCH CTLR SEEMED CONFUSED AS TO OUR INTENTIONS. CONTINUED TO NORMAL, UNEVENTFUL APCH AND LNDG.

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.