<< >> NASA ASRS Report 394543, February 1998

2 B737 on vectors for approach, under phl TRACON control, receive and react to TCASII RA's. Aircraft pass abeam each other with 1000 ft separation.

Attributes
ACN	394543
Time
Date	199802
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : phl
State Reference	PA
Altitude	msl bound lower : 3700 msl bound upper : 4700
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : phl
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	cruise other descent : approach
Route In Use	arrival other enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	cruise other descent : approach
Route In Use	arrival other enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : commercial pilot : instrument
Experience	flight time last 90 days : 180 flight time total : 13250 flight time type : 7000
ASRS Report	394543
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : required legal separation other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 15000 vertical : 500
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

We were 12 mi northwest of phl, 4000 ft MSL, base to final for ILS runway 9R. We were on heading of 180 degrees and conflicting was 360 degree heading but offset east 2 1/2 mi. We received TA on TCASII with him at 4500 ft MSL to our 4000 ft MSL. We received TCASII RA and descended to 3700 ft MSL where the TCASII event stopped. We reclbed to 4000 ft MSL. The other aircraft advised he had a TCASII event, and he climbed. We passed abeam 2 1/2 mi with 1000 ft vertical separation.

Related reports:

• Heavy jet on vectors for an ILS approach loses contact with ...

	Enter your search terms Submit search form
	Web www.37000feet.com

Original NASA ASRS Text

Title: 2 B737 ON VECTORS FOR APCH, UNDER PHL TRACON CTL, RECEIVE AND REACT TO TCASII RA'S. ACFT PASS ABEAM EACH OTHER WITH 1000 FT SEPARATION.

Narrative: WE WERE 12 MI NW OF PHL, 4000 FT MSL, BASE TO FINAL FOR ILS RWY 9R. WE WERE ON HEADING OF 180 DEGS AND CONFLICTING WAS 360 DEG HDG BUT OFFSET E 2 1/2 MI. WE RECEIVED TA ON TCASII WITH HIM AT 4500 FT MSL TO OUR 4000 FT MSL. WE RECEIVED TCASII RA AND DSNDED TO 3700 FT MSL WHERE THE TCASII EVENT STOPPED. WE RECLBED TO 4000 FT MSL. THE OTHER ACFT ADVISED HE HAD A TCASII EVENT, AND HE CLBED. WE PASSED ABEAM 2 1/2 MI WITH 1000 FT VERT SEPARATION.

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.