<< >> NASA ASRS Report 369130, May 1997

Medium large transport aircraft climbing in class B airspace had TCASII RA and followed it by descending contrary to departure controller instructions to expedite climb.

Attributes
ACN	369130
Time
Date	199705
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : ewr
State Reference	NJ
Altitude	msl bound lower : 2800 msl bound upper : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : zny
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : intermediate altitude
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 : 15000 flight time type : 3000
ASRS Report	369130
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	altitude deviation : undershoot conflict : nmac non adherence : clearance other anomaly other
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 other
Consequence	Other
Miss Distance	horizontal : 100 vertical : 0
Supplementary
Primary Problem	ATC Human Performance

Narrative:

We were issued a clearance to climb from 3000 ft to 10000 ft. This caused a TCASII RA due to converging VFR traffic at 3500 ft. After climb was initiated, the TCASII commanded a descent. ATC issued an expedite climb, but we followed the TCASII because the VFR traffic was not in sight. We descended to 2800 ft before we could return the aircraft to a climb. No other deviations were made. Most of my TCASII deviations have occurred in TCA's (class B) with known VFR traffic. I suggest all VFR traffic transiting a class B airspace to be handled as IFR traffic.

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Original NASA ASRS Text

Title: MLG ACFT CLBING IN CLASS B AIRSPACE HAD TCASII RA AND FOLLOWED IT BY DSNDING CONTRARY TO DEP CTLR INSTRUCTIONS TO EXPEDITE CLB.

Narrative: WE WERE ISSUED A CLRNC TO CLB FROM 3000 FT TO 10000 FT. THIS CAUSED A TCASII RA DUE TO CONVERGING VFR TFC AT 3500 FT. AFTER CLB WAS INITIATED, THE TCASII COMMANDED A DSCNT. ATC ISSUED AN EXPEDITE CLB, BUT WE FOLLOWED THE TCASII BECAUSE THE VFR TFC WAS NOT IN SIGHT. WE DSNDED TO 2800 FT BEFORE WE COULD RETURN THE ACFT TO A CLB. NO OTHER DEVS WERE MADE. MOST OF MY TCASII DEVS HAVE OCCURRED IN TCA'S (CLASS B) WITH KNOWN VFR TFC. I SUGGEST ALL VFR TFC TRANSITING A CLASS B AIRSPACE TO BE HANDLED AS IFR TFC.

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.