<< >> NASA ASRS Report 205875, March 1992

TCASII RA saves the day for air carrier mdt in commanding PIC of mdt to exercise an evasive action descend maneuver to avoid a midair. Near midair collision.

Attributes
ACN	205875
Time
Date	199203
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : bjb airport : mke
State Reference	WI
Altitude	msl bound lower : 4500 msl bound upper : 5000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : mke
Operator	common carrier : air carrier
Make Model Name	Medium Transport, Low Wing, 2 Turboprop Eng
Flight Phase	cruise other
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	climbout : intermediate altitude cruise other
Route In Use	enroute : direct
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 220 flight time total : 6000
ASRS Report	205875
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : nmac non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : exited adverse environment flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 0 vertical : 250
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation
Situations
ATC Facility	other physical facility

Narrative:

Observed traffic on TCASII at 11:30 O'clock position and approximately 6 mi climbing at 1500 ft below us at 3 mi 1000 ft below at 2 mi, and 12 O'clock position climbing 800 ft below. A TA was issued. I contacted the approach controller (mke approach on 126.5) and asked them if they had that traffic. They responded they did not! At 1 mi the traffic was 100 ft below us and climbing. An RA was issued to descend. We descended and advised approach that we were descending. At 4500 ft, we received the 'clear of traffic' and advised approach that we were clear and returning to 5000 ft. Traffic was now at our 6 O'clock position and 1 mi showing level at 5000 ft. We later observed the traffic at our 6 O'clock and 3 mi level at 5000 ft.

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Original NASA ASRS Text

Title: TCASII RA SAVES THE DAY FOR ACR MDT IN COMMANDING PIC OF MDT TO EXERCISE AN EVASIVE ACTION DSND MANEUVER TO AVOID A MIDAIR. NMAC.

Narrative: OBSERVED TFC ON TCASII AT 11:30 O'CLOCK POS AND APPROX 6 MI CLBING AT 1500 FT BELOW US AT 3 MI 1000 FT BELOW AT 2 MI, AND 12 O'CLOCK POS CLBING 800 FT BELOW. A TA WAS ISSUED. I CONTACTED THE APCH CTLR (MKE APCH ON 126.5) AND ASKED THEM IF THEY HAD THAT TFC. THEY RESPONDED THEY DID NOT! AT 1 MI THE TFC WAS 100 FT BELOW US AND CLBING. AN RA WAS ISSUED TO DSND. WE DSNDED AND ADVISED APCH THAT WE WERE DSNDING. AT 4500 FT, WE RECEIVED THE 'CLR OF TFC' AND ADVISED APCH THAT WE WERE CLR AND RETURNING TO 5000 FT. TFC WAS NOW AT OUR 6 O'CLOCK POS AND 1 MI SHOWING LEVEL AT 5000 FT. WE LATER OBSERVED THE TFC AT OUR 6 O'CLOCK AND 3 MI LEVEL AT 5000 FT.

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.