A DC9 comes in close proximity to a C337 on a 5 mi final to buf and reacts to a TCAS RA.

Attributes
ACN	475416
Time
Date	200006
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : buf.airport
State Reference	NY
Altitude	msl single value : 2500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : buf.tracon
Operator	common carrier : air carrier
Make Model Name	DC-9 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 05
Flight Phase	descent : vacating altitude
Route In Use	approach : instrument precision
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : buf.tracon
Operator	general aviation : personal
Make Model Name	Skymaster
Operating Under FAR Part	Part 91
Flight Phase	descent : intermediate altitude
Route In Use	arrival : vfr arrival : on vectors
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : commercial pilot : flight engineer pilot : multi engine pilot : instrument pilot : atp
Experience	flight time last 90 days : 180 flight time total : 15000 flight time type : 180
ASRS Report	475416
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : multi engine
Events
Anomaly	airspace violation : entry non adherence : clearance non adherence : far other spatial deviation
Independent Detector	aircraft equipment : tcas other controllera other flight crewa
Resolutory Action	controller : issued advisory flight crew : took precautionary avoidance action
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance Aircraft
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

On initial contact with approach control (buf) we heard controllers having difficult time with a cessna 337. He (the cessna pilot) could not read back or apparently follow very simple instructions correctly. I became more concerned as we approached buf as the pilot seemed fairly confused on the radio. At about 10 mi final approach started calling his relative position to us. It became apparent that the cessna would be a factor and we started scanning more diligently. At about 5 mi final we got an RA from the TCASII at the exact same time we acquired visual contact. An abrupt maneuver wasn't necessary but we did have to turn away and off the localizer runway 5 to retain adequate separation. I called approach supervisor by phone to discuss the event and asked for tapes to be pulled and forwarded to FSDO.

Original NASA ASRS Text

Title: A DC9 COMES IN CLOSE PROX TO A C337 ON A 5 MI FINAL TO BUF AND REACTS TO A TCAS RA.

Narrative: ON INITIAL CONTACT WITH APCH CTL (BUF) WE HEARD CTLRS HAVING DIFFICULT TIME WITH A CESSNA 337. HE (THE CESSNA PLT) COULD NOT READ BACK OR APPARENTLY FOLLOW VERY SIMPLE INSTRUCTIONS CORRECTLY. I BECAME MORE CONCERNED AS WE APCHED BUF AS THE PLT SEEMED FAIRLY CONFUSED ON THE RADIO. AT ABOUT 10 MI FINAL APCH STARTED CALLING HIS RELATIVE POS TO US. IT BECAME APPARENT THAT THE CESSNA WOULD BE A FACTOR AND WE STARTED SCANNING MORE DILIGENTLY. AT ABOUT 5 MI FINAL WE GOT AN RA FROM THE TCASII AT THE EXACT SAME TIME WE ACQUIRED VISUAL CONTACT. AN ABRUPT MANEUVER WASN'T NECESSARY BUT WE DID HAVE TO TURN AWAY AND OFF THE LOC RWY 5 TO RETAIN ADEQUATE SEPARATION. I CALLED APCH SUPVR BY PHONE TO DISCUSS THE EVENT AND ASKED FOR TAPES TO BE PULLED AND FORWARDED TO FSDO.

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.