<< >> NASA ASRS Report 391900, January 1998

MD88 aircraft in descent to make crossing restr received TCASII TA and then RA on traffic 1000 ft below. Reporter first officer overshot assigned altitude by 100 ft due to distrs of TCASII and ATC communication.

Attributes
ACN	391900
Time
Date	199801
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : phx
State Reference	AZ
Altitude	msl bound lower : 11900 msl bound upper : 12000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : phx
Operator	common carrier : air carrier
Make Model Name	MD-82
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	cruise other descent other
Route In Use	enroute airway : phx
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : cfi pilot : commercial pilot : flight engineer pilot : instrument pilot : atp
Experience	flight time last 90 days : 210 flight time total : 3800 flight time type : 650
ASRS Report	391900
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : cfi pilot : atp
Experience	flight time last 90 days : 200 flight time total : 19250 flight time type : 200
ASRS Report	391999
Events
Anomaly	altitude deviation : overshoot conflict : airborne less severe non adherence : clearance 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 : 5300 vertical : 1000
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	other
Situations
ATC Facility	procedure or policy : unspecified

Narrative:

Descending into phx, ATC instructed us to cross tonto intersection at 12000 ft, 250 KTS. Descending about 2500 FPM, we received TA then RA at about 13000 ft for traffic at 11000 ft. During this RA, and ATC telling us about the traffic, we descended to about 11900 ft. ATC asked what our altitude was, and we then climbed back to 12000 ft. From a pilot's point of view, descending to make a crossing restr on top of slow moving aircraft, and to have only 1000 ft separation, can cause some discomfort in the cockpit -- especially with TCASII warnings.

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Original NASA ASRS Text

Title: MD88 ACFT IN DSCNT TO MAKE XING RESTR RECEIVED TCASII TA AND THEN RA ON TFC 1000 FT BELOW. RPTR FO OVERSHOT ASSIGNED ALT BY 100 FT DUE TO DISTRS OF TCASII AND ATC COM.

Narrative: DSNDING INTO PHX, ATC INSTRUCTED US TO CROSS TONTO INTXN AT 12000 FT, 250 KTS. DSNDING ABOUT 2500 FPM, WE RECEIVED TA THEN RA AT ABOUT 13000 FT FOR TFC AT 11000 FT. DURING THIS RA, AND ATC TELLING US ABOUT THE TFC, WE DSNDED TO ABOUT 11900 FT. ATC ASKED WHAT OUR ALT WAS, AND WE THEN CLBED BACK TO 12000 FT. FROM A PLT'S POINT OF VIEW, DSNDING TO MAKE A XING RESTR ON TOP OF SLOW MOVING ACFT, AND TO HAVE ONLY 1000 FT SEPARATION, CAN CAUSE SOME DISCOMFORT IN THE COCKPIT -- ESPECIALLY WITH TCASII WARNINGS.

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.