C560 experiences near midair collision on visual approach to dvt.

Attributes
ACN	740952
Time
Date	200706
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : dvt.airport
State Reference	AZ
Altitude	msl single value : 4000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : p50.tracon tower : dvt.tower
Operator	general aviation : corporate
Make Model Name	Citation V
Operating Under FAR Part	Part 91
Navigation In Use	other
Flight Phase	descent : approach
Route In Use	approach : visual arrival star : lacb5
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : p50.tracon
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	climbout : takeoff
Person 1
Affiliation	company : corporate
Function	flight crew : captain
Qualification	pilot : flight engineer pilot : cfi pilot : atp pilot : multi engine
Experience	controller military : 1.5 controller non radar : 1.5 flight time last 90 days : 120 flight time total : 19500 flight time type : 2000
ASRS Report	740952
Person 2
Affiliation	other
Function	flight crew : first officer
Events
Anomaly	conflict : nmac
Independent Detector	aircraft equipment : tcas other controllera other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance
Primary Problem	Ambiguous

Narrative:

We departed on an IFR flight plan; with dvt as destination. Owner/PF was occupying the left seat. Reporter (PIC) was acting as PNF. We had proceeded on the JACBS2 arrival and were eventually told to descend to 4000 ft and proceed to the airport and call it in sight. This call was made about 7 mi out and clearance for a visual approach to runway 25L given and instructions to change to the north side tower frequency and attention called to another traffic at our 9 O'clock position. Our TCAS was picking up this bogey and showing it about 300 ft below us. The PF began a left turn and leveled off into a slight climb (we had already begun our descent) and as I was about to contact the tower when I visually saw the other traffic; flying eastbound and on an exact collision course with us and instantly grabbed the control wheel and briskly pulled us up into a very steep climb and seconds later heard the sound of the propeller(south) passing just underneath us. Only then was there time to communicate with the control tower; which in turn switched us to the south side frequency; followed by landing instructions. The tower was later contacted by phone. It can only be speculated that the other airplane was also climbing. The TCAS on this citation V does have a display lag of sorts.

Original NASA ASRS Text

Title: C560 EXPERIENCES NMAC ON VISUAL APCH TO DVT.

Narrative: WE DEPARTED ON AN IFR FLT PLAN; WITH DVT AS DEST. OWNER/PF WAS OCCUPYING THE L SEAT. RPTR (PIC) WAS ACTING AS PNF. WE HAD PROCEEDED ON THE JACBS2 ARR AND WERE EVENTUALLY TOLD TO DSND TO 4000 FT AND PROCEED TO THE ARPT AND CALL IT IN SIGHT. THIS CALL WAS MADE ABOUT 7 MI OUT AND CLRNC FOR A VISUAL APCH TO RWY 25L GIVEN AND INSTRUCTIONS TO CHANGE TO THE N SIDE TWR FREQ AND ATTN CALLED TO ANOTHER TFC AT OUR 9 O'CLOCK POS. OUR TCAS WAS PICKING UP THIS BOGEY AND SHOWING IT ABOUT 300 FT BELOW US. THE PF BEGAN A L TURN AND LEVELED OFF INTO A SLIGHT CLB (WE HAD ALREADY BEGUN OUR DSCNT) AND AS I WAS ABOUT TO CONTACT THE TWR WHEN I VISUALLY SAW THE OTHER TFC; FLYING EBOUND AND ON AN EXACT COLLISION COURSE WITH US AND INSTANTLY GRABBED THE CTL WHEEL AND BRISKLY PULLED US UP INTO A VERY STEEP CLB AND SECONDS LATER HEARD THE SOUND OF THE PROP(S) PASSING JUST UNDERNEATH US. ONLY THEN WAS THERE TIME TO COMMUNICATE WITH THE CTL TWR; WHICH IN TURN SWITCHED US TO THE S SIDE FREQ; FOLLOWED BY LNDG INSTRUCTIONS. THE TWR WAS LATER CONTACTED BY PHONE. IT CAN ONLY BE SPECULATED THAT THE OTHER AIRPLANE WAS ALSO CLBING. THE TCAS ON THIS CITATION V DOES HAVE A DISPLAY LAG OF SORTS.

Data retrieved from NASA's ASRS site as of January 2009 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.