Flight crew took evasive action to avoid an aircraft that had penetrated class B airspace, without a...

Attributes
ACN	296582
Time
Date	199502
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : pxr airport : phx
State Reference	AZ
Altitude	msl bound lower : 5200 msl bound upper : 5200
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : phx
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	descent : approach descent other
Route In Use	arrival other
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	other : unknown
Flight Phase	cruise other
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 240 flight time total : 18000 flight time type : 7000
ASRS Report	296582
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	conflict : nmac non adherence : far non adherence : required legal separation non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	controller : issued new clearance flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 200 vertical : 0
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

TCASII target appeared at 12 O'clock position at approximately 2 mi, showing 900 ft. We were descending per ATC clearance from 6000 ft to 4000 ft MSL. TCASII RA/TA said 'climb, climb now' which we immediately did. Aircraft passed slightly off to our left, same altitude of 5200 ft MSL. Phx approach confirmed intruder was inside TCA and not known to ATC, or communicating with anyone. I am convinced that collision would, most likely, have occurred without the benefit of TCASII.

Original NASA ASRS Text

Title: FLC TOOK EVASIVE ACTION TO AVOID AN ACFT THAT HAD PENETRATED CLASS B AIRSPACE, WITHOUT A CLRNC.

Narrative: TCASII TARGET APPEARED AT 12 O'CLOCK POS AT APPROX 2 MI, SHOWING 900 FT. WE WERE DSNDING PER ATC CLRNC FROM 6000 FT TO 4000 FT MSL. TCASII RA/TA SAID 'CLB, CLB NOW' WHICH WE IMMEDIATELY DID. ACFT PASSED SLIGHTLY OFF TO OUR L, SAME ALT OF 5200 FT MSL. PHX APCH CONFIRMED INTRUDER WAS INSIDE TCA AND NOT KNOWN TO ATC, OR COMMUNICATING WITH ANYONE. I AM CONVINCED THAT COLLISION WOULD, MOST LIKELY, HAVE OCCURRED WITHOUT THE BENEFIT OF 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.

Flight crew took evasive action to avoid an aircraft that had penetrated class B airspace, without a clearance.