<< >> NASA ASRS Report 214853, June 1992

Air carrier X uncoordinated descent into departure control airspace TCASII RA had less than standard separation from air carrier Y. System error.

Attributes
ACN	214853
Time
Date	199206
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : pxr
State Reference	AZ
Altitude	msl bound lower : 7000 msl bound upper : 8000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : phx
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
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : on vectors
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 : 13000 flight time type : 4000
ASRS Report	214853
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	faa : investigated
Miss Distance	horizontal : 3000 vertical : 800
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Air carrier X after passing plsnt intersection on approach to phx, we were issued a descent to 10000 ft and slow to 250 KTS. Shortly thereafter, were assigned to descend to 7000 ft and slow to 210 KTS. As we descended, my first officer and I noticed a company air carrier Y headed nebound which had departed runway 26R and was now at our 2 O'clock. We both remarked that the closure rate and separation seemed less than normal. As the aircraft disappeared behind us at our 4 O'clock we received a TCASII 'monitor vertical speed.' several seconds later ATC requested our altitude, which was the 7500 ft. We were advised that our assigned altitude was 10000 and not 7000 ft and were instructed to climb to 8000 ft. I responded that 'for the record we were assigned 7000 ft and 210 KTS.' the flight was completed without further incident. Our company/ATC liaison confirmed via ATC tapes that the controller had issued a descent to 7000 ft.

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Original NASA ASRS Text

Title: ACR X UNCOORDINATED DSCNT INTO DEP CTL AIRSPACE TCASII RA HAD LTSS FROM ACR Y. SYS ERROR.

Narrative: ACR X AFTER PASSING PLSNT INTXN ON APCH TO PHX, WE WERE ISSUED A DSCNT TO 10000 FT AND SLOW TO 250 KTS. SHORTLY THEREAFTER, WERE ASSIGNED TO DSND TO 7000 FT AND SLOW TO 210 KTS. AS WE DSNDED, MY FO AND I NOTICED A COMPANY ACR Y HEADED NEBOUND WHICH HAD DEPARTED RWY 26R AND WAS NOW AT OUR 2 O'CLOCK. WE BOTH REMARKED THAT THE CLOSURE RATE AND SEPARATION SEEMED LESS THAN NORMAL. AS THE ACFT DISAPPEARED BEHIND US AT OUR 4 O'CLOCK WE RECEIVED A TCASII 'MONITOR VERT SPD.' SEVERAL SECONDS LATER ATC REQUESTED OUR ALT, WHICH WAS THE 7500 FT. WE WERE ADVISED THAT OUR ASSIGNED ALT WAS 10000 AND NOT 7000 FT AND WERE INSTRUCTED TO CLB TO 8000 FT. I RESPONDED THAT 'FOR THE RECORD WE WERE ASSIGNED 7000 FT AND 210 KTS.' THE FLT WAS COMPLETED WITHOUT FURTHER INCIDENT. OUR COMPANY/ATC LIAISON CONFIRMED VIA ATC TAPES THAT THE CTLR HAD ISSUED A DSCNT TO 7000 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.