<< >> NASA ASRS Report 204944, March 1992

TCASII RA prevents a mid air in an near midair collision event when pilot response is to create an evasive action level off.

Attributes
ACN	204944
Time
Date	199203
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : chs
State Reference	SC
Altitude	msl bound lower : 5500 msl bound upper : 6000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : chs
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	descent other
Route In Use	enroute : direct
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Aircraft
Flight Phase	cruise other
Route In Use	enroute : direct
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 4500 flight time type : 50
ASRS Report	204944
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : instrument pilot : atp pilot : commercial
Experience	flight time last 90 days : 200 flight time total : 9000 flight time type : 800
ASRS Report	204933
Events
Anomaly	conflict : nmac non adherence : far other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 0 vertical : 500
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

Cleared to descend from 11000 ft to 2000 ft with chs approach control. At 6500 ft received a TCASII TA, at 6000 ft received a RA. Stopped the descent at 6000 ft and visually idented a light aircraft at 12 O'clock and about 5500 ft MSL. We maintained 6000 ft and passed over the top of the aircraft. Approach control did not have any contact with the aircraft. If it weren't for the TCASII alert we probably wouldn't have seen the other aircraft until it was too late to do anything about it. This incident confirmed my belief in the effectiveness of TCASII. Supplemental information from acn 204933. It reinforces the need to keep a vigilant look- out (and believe TCASII).

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Original NASA ASRS Text

Title: TCASII RA PREVENTS A MID AIR IN AN NMAC EVENT WHEN PLT RESPONSE IS TO CREATE AN EVASIVE ACTION LEVEL OFF.

Narrative: CLRED TO DSND FROM 11000 FT TO 2000 FT WITH CHS APCH CTL. AT 6500 FT RECEIVED A TCASII TA, AT 6000 FT RECEIVED A RA. STOPPED THE DSCNT AT 6000 FT AND VISUALLY IDENTED A LIGHT ACFT AT 12 O'CLOCK AND ABOUT 5500 FT MSL. WE MAINTAINED 6000 FT AND PASSED OVER THE TOP OF THE ACFT. APCH CTL DID NOT HAVE ANY CONTACT WITH THE ACFT. IF IT WEREN'T FOR THE TCASII ALERT WE PROBABLY WOULDN'T HAVE SEEN THE OTHER ACFT UNTIL IT WAS TOO LATE TO DO ANYTHING ABOUT IT. THIS INCIDENT CONFIRMED MY BELIEF IN THE EFFECTIVENESS OF TCASII. SUPPLEMENTAL INFO FROM ACN 204933. IT REINFORCES THE NEED TO KEEP A VIGILANT LOOK- OUT (AND BELIEVE TCASII).

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.