Air carrier large transport altitude deviation excursion from clearance altitude in response to TCAS...

Attributes
ACN	197509
Time
Date	199112
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : hdf airport : san
State Reference	CA
Altitude	msl bound lower : 10000 msl bound upper : 11100
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : san tracon : dov
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : flight engineer pilot : commercial pilot : atp pilot : private
Experience	flight time last 90 days : 210 flight time total : 7000 flight time type : 2000
ASRS Report	197509
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : flight engineer pilot : instrument
Experience	flight time last 90 days : 200 flight time total : 3000 flight time type : 250
ASRS Report	197567
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : returned to intended course or assigned course other
Consequence	Other
Miss Distance	horizontal : 0 vertical : 700
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

While level 10000 ft, 370 KTS, and navigating inbound to hdf VOR, we observed TCASII traffic at 400 ft, 5 mi ahead. We were looking for this traffic and trying to get a word in edgewise to san approach, who was controling us, but she was talking to another aircraft about a practice instrument approach. Meanwhile, the resolution alert on the TCASII activated and commanded a 2000 FPM climb which we initiated. When the conflict was clear and the TCASII gave us a monitor vertical speed, we began our descent back to 10000 ft having climbed to 11000 ft. We still could not contact approach, who was still talking to the other aircraft. Finally, we told the controller what had happened, and shortly thereafter, we got a second resolution alert on another set of traffic. We told the controller and she gave us a 20 degree heading change. The RA ended and the conflict was over.

Original NASA ASRS Text

Title: ACR LGT ALTDEV EXCURSION FROM CLRNC ALT IN RESPONSE TO TCASII RA.

Narrative: WHILE LEVEL 10000 FT, 370 KTS, AND NAVIGATING INBOUND TO HDF VOR, WE OBSERVED TCASII TFC AT 400 FT, 5 MI AHEAD. WE WERE LOOKING FOR THIS TFC AND TRYING TO GET A WORD IN EDGEWISE TO SAN APCH, WHO WAS CTLING US, BUT SHE WAS TALKING TO ANOTHER ACFT ABOUT A PRACTICE INST APCH. MEANWHILE, THE RESOLUTION ALERT ON THE TCASII ACTIVATED AND COMMANDED A 2000 FPM CLB WHICH WE INITIATED. WHEN THE CONFLICT WAS CLR AND THE TCASII GAVE US A MONITOR VERT SPD, WE BEGAN OUR DSCNT BACK TO 10000 FT HAVING CLBED TO 11000 FT. WE STILL COULD NOT CONTACT APCH, WHO WAS STILL TALKING TO THE OTHER ACFT. FINALLY, WE TOLD THE CTLR WHAT HAD HAPPENED, AND SHORTLY THEREAFTER, WE GOT A SECOND RESOLUTION ALERT ON ANOTHER SET OF TFC. WE TOLD THE CTLR AND SHE GAVE US A 20 DEG HDG CHANGE. THE RA ENDED AND THE CONFLICT WAS OVER.

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.

Air carrier large transport altitude deviation excursion from clearance altitude in response to TCASII RA.