<< >> NASA ASRS Report 266717, March 1994

Air carrier X refused approach clearance because of TCASII interpretation. Possible equipment problem TCASII.

Attributes
ACN	266717
Time
Date	199403
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : fll
State Reference	FL
Altitude	msl bound lower : 2000 msl bound upper : 2000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : mia
Operator	common carrier : air taxi
Make Model Name	Dash 8 Series Undifferentiated or Other Model
Operating Under FAR Part	Part 135
Flight Phase	descent : approach
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
ASRS Report	266717
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	other anomaly other
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

Air carrier X, a oh-8, was being vectored for visual approach to runway 9L at fll. About 10 mi wnw of fll, I asked air carrier X if he had fll in sight and attempted to clear him for visual approach. Pilot would not accept visual approach clearance because his TCASII 'screen was filled with airplanes' between him and airport. In reality, there was no other traffic. I cleared him for ILS approach, which he accepted, and he flew same course he would have flown on visual approach. This was disruptive because I had to devote more time to 1 aircraft than should have been necessary and I was working 6 other aircraft. Apparently his TCASII was malfunctioning.

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Original NASA ASRS Text

Title: ACR X REFUSED APCH CLRNC BECAUSE OF TCASII INTERP. POSSIBLE EQUIP PROB TCASII.

Narrative: ACR X, A OH-8, WAS BEING VECTORED FOR VISUAL APCH TO RWY 9L AT FLL. ABOUT 10 MI WNW OF FLL, I ASKED ACR X IF HE HAD FLL IN SIGHT AND ATTEMPTED TO CLR HIM FOR VISUAL APCH. PLT WOULD NOT ACCEPT VISUAL APCH CLRNC BECAUSE HIS TCASII 'SCREEN WAS FILLED WITH AIRPLANES' BTWN HIM AND ARPT. IN REALITY, THERE WAS NO OTHER TFC. I CLRED HIM FOR ILS APCH, WHICH HE ACCEPTED, AND HE FLEW SAME COURSE HE WOULD HAVE FLOWN ON VISUAL APCH. THIS WAS DISRUPTIVE BECAUSE I HAD TO DEVOTE MORE TIME TO 1 ACFT THAN SHOULD HAVE BEEN NECESSARY AND I WAS WORKING 6 OTHER ACFT. APPARENTLY HIS TCASII WAS MALFUNCTIONING.

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.