<< >> NASA ASRS Report 268588, April 1994

Air carrier X unintended use of TCASII speed reduction for spacing. Pilot deviation

Attributes
ACN	268588
Time
Date	199404
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : mia
State Reference	FL
Altitude	msl bound lower : 3000 msl bound upper : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : mia
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 160 flight time total : 14700 flight time type : 9950
ASRS Report	268588
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	non adherence : clearance other anomaly
Independent Detector	other controllera
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Air carrier X on ILS runway 9R mia int, cleared for visual approach to runway 9R. Instructed to maintain 190 KTS to 5 DME. At 8 DME we appeared to be rapidly closing on led aircraft (from 5 mi to 3 1/2 mi fairly quickly) noticed this visually and on TCASII. Slowed our aircraft to 170 KTS controller became concerned about our speed and I advised we had slowed because of our conversion rate. We picked our speed back up and were on a 2 mi final when lead aircraft cleared runway.

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Original NASA ASRS Text

Title: ACR X UNINTENDED USE OF TCASII SPD REDUCTION FOR SPACING. PLTDEV

Narrative: ACR X ON ILS RWY 9R MIA INT, CLRED FOR VISUAL APCH TO RWY 9R. INSTRUCTED TO MAINTAIN 190 KTS TO 5 DME. AT 8 DME WE APPEARED TO BE RAPIDLY CLOSING ON LED ACFT (FROM 5 MI TO 3 1/2 MI FAIRLY QUICKLY) NOTICED THIS VISUALLY AND ON TCASII. SLOWED OUR ACFT TO 170 KTS CTLR BECAME CONCERNED ABOUT OUR SPD AND I ADVISED WE HAD SLOWED BECAUSE OF OUR CONVERSION RATE. WE PICKED OUR SPD BACK UP AND WERE ON A 2 MI FINAL WHEN LEAD ACFT CLRED RWY.

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.