Air carrier-large transport may have made CAT ii landing without clearance.

Attributes
ACN	138986
Time
Date	199003
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : dtw
State Reference	MI
Environment
Flight Conditions	IMC
Light	Dawn
Aircraft 1
Controlling Facilities	tower : dtw
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	descent : approach landing other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 180 flight time total : 11000 flight time type : 8000
ASRS Report	138986
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 140 flight time total : 3500 flight time type : 140
ASRS Report	139117
Events
Anomaly	incursion : landing without clearance other anomaly other
Independent Detector	other controllera
Resolutory Action	other other
Consequence	Other
Supplementary
Primary Problem	Ambiguous
Air Traffic Incident	Pilot Deviation

Narrative:

First officer experienced difficulty establishing contact with tower inside marker when handed off from approach control with runway insight, I elected to land assuming CAT ii protection afforded margin of safety. No incident occurred and tower indicated verbally after T/D that the situation (lack of contact prior to T/D) did not in this case present a problem to them and no report was filed. Supplemental information from acn 139117. On this approach G/south intercept and marker crossing occurred virtually simultaneously. This is a work intensive event (insuring autoplt G/south capture, setting flaps 30, xchking altitude over the marker and setting the missed approach altitude) and approach control's previous instruction to contact tower at the marker was overlooked. During the flare approach again instructed us to contact tower. Landing clearance was confirmed as the aircraft touched down.

Original NASA ASRS Text

Title: ACR-LGT MAY HAVE MADE CAT II LNDG WITHOUT CLRNC.

Narrative: F/O EXPERIENCED DIFFICULTY ESTABLISHING CONTACT WITH TWR INSIDE MARKER WHEN HANDED OFF FROM APCH CTL WITH RWY INSIGHT, I ELECTED TO LAND ASSUMING CAT II PROTECTION AFFORDED MARGIN OF SAFETY. NO INCIDENT OCCURRED AND TWR INDICATED VERBALLY AFTER T/D THAT THE SITUATION (LACK OF CONTACT PRIOR TO T/D) DID NOT IN THIS CASE PRESENT A PROB TO THEM AND NO RPT WAS FILED. SUPPLEMENTAL INFO FROM ACN 139117. ON THIS APCH G/S INTERCEPT AND MARKER XING OCCURRED VIRTUALLY SIMULTANEOUSLY. THIS IS A WORK INTENSIVE EVENT (INSURING AUTOPLT G/S CAPTURE, SETTING FLAPS 30, XCHKING ALT OVER THE MARKER AND SETTING THE MISSED APCH ALT) AND APCH CTL'S PREVIOUS INSTRUCTION TO CONTACT TWR AT THE MARKER WAS OVERLOOKED. DURING THE FLARE APCH AGAIN INSTRUCTED US TO CONTACT TWR. LNDG CLRNC WAS CONFIRMED AS THE ACFT TOUCHED DOWN.

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.