B727 flight crew responds to TCASII RA while performing an emergency procedure.

Attributes
ACN	441860
Time
Date	199907
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : ewr.airport
State Reference	NJ
Altitude	msl single value : 4000
Environment
Flight Conditions	VMC
Weather Elements	other
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : n90.tracon
Operator	common carrier : air carrier
Make Model Name	B727 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : holding
Route In Use	arrival : on vectors
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : n90.tracon
Operator	general aviation : personal
Make Model Name	Beechcraft, Beech Aircraft Corp Undifferentiated or Other Model
Operating Under FAR Part	Part 91
Flight Phase	cruise : enroute altitude change
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : flight engineer pilot : commercial pilot : atp pilot : instrument
Experience	flight time last 90 days : 200 flight time total : 13000 flight time type : 600
ASRS Report	441860
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : cfi pilot : flight engineer
Experience	flight time last 90 days : 200 flight time total : 8000 flight time type : 200
ASRS Report	442080
Events
Anomaly	aircraft equipment problem : critical altitude deviation : excursion from assigned altitude conflict : airborne critical
Independent Detector	aircraft equipment : tcas other controllera other flight crewa other flight crewb
Resolutory Action	flight crew : returned to assigned altitude flight crew : declared emergency
Miss Distance	horizontal : 0 vertical : 500
Supplementary
Problem Areas	Airspace Structure Flight Crew Human Performance Aircraft ATC Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

While in a vectored holding pattern while we were performing a system 'a' hydraulic failure procedure (we had declared an emergency) ATC advised us of traffic approaching from our right at 500 ft above us, type unknown. Visual contact was made close in, aircraft passed above on our right side. TCASII RA occurred to monitor descent. We were then given 180 degree turn and as we rolled out, a second TCASII RA occurred 'monitor descent' and then indicated climb. Aircraft was finally observed on our left descending, going under us. We were level at 4000 ft MSL during both RA's. We were not sure if it was the same aircraft both time or separate events.

Original NASA ASRS Text

Title: B727 FLC RESPONDS TO TCASII RA WHILE PERFORMING AN EMER PROC.

Narrative: WHILE IN A VECTORED HOLDING PATTERN WHILE WE WERE PERFORMING A SYSTEM 'A' HYD FAILURE PROC (WE HAD DECLARED AN EMER) ATC ADVISED US OF TFC APCHING FROM OUR R AT 500 FT ABOVE US, TYPE UNKNOWN. VISUAL CONTACT WAS MADE CLOSE IN, ACFT PASSED ABOVE ON OUR R SIDE. TCASII RA OCCURRED TO MONITOR DSCNT. WE WERE THEN GIVEN 180 DEG TURN AND AS WE ROLLED OUT, A SECOND TCASII RA OCCURRED 'MONITOR DSCNT' AND THEN INDICATED CLB. ACFT WAS FINALLY OBSERVED ON OUR L DSNDING, GOING UNDER US. WE WERE LEVEL AT 4000 FT MSL DURING BOTH RA'S. WE WERE NOT SURE IF IT WAS THE SAME ACFT BOTH TIME OR SEPARATE EVENTS.

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.