Flight crew of an medium large transport descended in response to a TCASII RA resulting in a near mi...

Attributes
ACN	281741
Time
Date	199408
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : sji
State Reference	AL
Altitude	msl bound lower : 27000 msl bound upper : 27000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zhu
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Route In Use	enroute airway : j2
Flight Plan	IFR
Aircraft 2
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	descent other
Flight Plan	IFR
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 : 14000 flight time type : 6000
ASRS Report	281741
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 100 flight time total : 12000 flight time type : 7000
ASRS Report	281327
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : nmac non adherence : clearance non adherence : required legal separation
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 1 vertical : 500
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

We were IFR, night, in the clear. Given traffic 12 O'clock at FL280. We were at FL270. Called traffic in sight, after which we were cleared to FL290. During our climb TCASII gave a TA/RA to descend at 2500 FPM, we complied. We told ATC about our RA and asked them what altitude the traffic was at. Traffic admitted he was off his altitude. This is not the only time TCASII has saved the day. It's worth its weight in gold/lives saved! Supplemental information from acn 281327: I pushed over into descent as we matched the traffic displayed to the aircraft passing just off to our left side and above us. Due to visual confirmation of aircraft passing us I stopped descent at 26700 ft. Other aircraft showed only plus 500 ft as he went by, so he evidently went approximately 800 ft below his altitude very abruptly. The rest of the flight was uneventful.

Original NASA ASRS Text

Title: FLC OF AN MLG DSNDED IN RESPONSE TO A TCASII RA RESULTING IN A NMAC.

Narrative: WE WERE IFR, NIGHT, IN THE CLR. GIVEN TFC 12 O'CLOCK AT FL280. WE WERE AT FL270. CALLED TFC IN SIGHT, AFTER WHICH WE WERE CLRED TO FL290. DURING OUR CLB TCASII GAVE A TA/RA TO DSND AT 2500 FPM, WE COMPLIED. WE TOLD ATC ABOUT OUR RA AND ASKED THEM WHAT ALT THE TFC WAS AT. TFC ADMITTED HE WAS OFF HIS ALT. THIS IS NOT THE ONLY TIME TCASII HAS SAVED THE DAY. IT'S WORTH ITS WT IN GOLD/LIVES SAVED! SUPPLEMENTAL INFO FROM ACN 281327: I PUSHED OVER INTO DSCNT AS WE MATCHED THE TFC DISPLAYED TO THE ACFT PASSING JUST OFF TO OUR L SIDE AND ABOVE US. DUE TO VISUAL CONFIRMATION OF ACFT PASSING US I STOPPED DSCNT AT 26700 FT. OTHER ACFT SHOWED ONLY PLUS 500 FT AS HE WENT BY, SO HE EVIDENTLY WENT APPROX 800 FT BELOW HIS ALT VERY ABRUPTLY. THE REST OF THE FLT WAS UNEVENTFUL.

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 of an medium large transport descended in response to a TCASII RA resulting in a near midair collision.