Near midair collision between a DO328, on a right base and a single engine cessna crossing underneat...

Attributes
ACN	369190
Time
Date	199705
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : bli
State Reference	WA
Altitude	msl bound lower : 1700 msl bound upper : 1700
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : bli
Operator	common carrier : air carrier
Make Model Name	Light Transport, High Wing, 2 Turboprop Eng
Navigation In Use	Other Other
Flight Phase	descent : approach other
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	climbout : intermediate altitude
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 30 flight time total : 8000 flight time type : 1200
ASRS Report	369190
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	conflict : nmac other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : anomaly accepted none taken : insufficient time
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 150 vertical : 50
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

We contacted bli local approach 8 NM south of airport, and were cleared to land on runway 16 via r-hand traffic pattern. No radio calls were made indicating possible conflicting traffic (except for one aircraft inbound from the west, that traffic, on TCASII was no factor). Approximately 4 mins later, while on a right base leg, first officer (PF) observed small cessna (152, 172) pass under us from right to left. First officer had no time to react or take evasive action, other than to slow our rate of descent. We were in a 500- 600 FPM descent from 2000 ft MSL traffic pattern altitude, and never saw the conflicting traffic, who apparently was doing a right downwind departure from bli. We reported the near miss to tower, and an aircraft replied 'that might have been us.' tower said something to the effect that 'did not know he was going to depart to the north, thought he was departing west.' on the ground, local said 'he's (the conflict aircraft) a local pilot, we'll talk to him when he gets back.' I believe this incident would not have occurred if bli tower had issued a TA to either/both aircraft involved. Also, it appears that tower was not aware of the location of the cessna airplane, even though it was well within the air traffic area.

Original NASA ASRS Text

Title: NMAC BTWN A DO328, ON A R BASE AND A SINGLE ENG CESSNA XING UNDERNEATH ON DEP. BOTH ACFT WERE UNDER TWR CTL.

Narrative: WE CONTACTED BLI LCL APCH 8 NM S OF ARPT, AND WERE CLRED TO LAND ON RWY 16 VIA R-HAND TFC PATTERN. NO RADIO CALLS WERE MADE INDICATING POSSIBLE CONFLICTING TFC (EXCEPT FOR ONE ACFT INBOUND FROM THE W, THAT TFC, ON TCASII WAS NO FACTOR). APPROX 4 MINS LATER, WHILE ON A R BASE LEG, FO (PF) OBSERVED SMALL CESSNA (152, 172) PASS UNDER US FROM R TO L. FO HAD NO TIME TO REACT OR TAKE EVASIVE ACTION, OTHER THAN TO SLOW OUR RATE OF DSCNT. WE WERE IN A 500- 600 FPM DSCNT FROM 2000 FT MSL TFC PATTERN ALT, AND NEVER SAW THE CONFLICTING TFC, WHO APPARENTLY WAS DOING A R DOWNWIND DEP FROM BLI. WE RPTED THE NEAR MISS TO TWR, AND AN ACFT REPLIED 'THAT MIGHT HAVE BEEN US.' TWR SAID SOMETHING TO THE EFFECT THAT 'DID NOT KNOW HE WAS GOING TO DEPART TO THE N, THOUGHT HE WAS DEPARTING W.' ON THE GND, LCL SAID 'HE'S (THE CONFLICT ACFT) A LCL PLT, WE'LL TALK TO HIM WHEN HE GETS BACK.' I BELIEVE THIS INCIDENT WOULD NOT HAVE OCCURRED IF BLI TWR HAD ISSUED A TA TO EITHER/BOTH ACFT INVOLVED. ALSO, IT APPEARS THAT TWR WAS NOT AWARE OF THE LOCATION OF THE CESSNA AIRPLANE, EVEN THOUGH IT WAS WELL WITHIN THE ATA.

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.

Near midair collision between a DO328, on a right base and a single engine cessna crossing underneath on departure. Both aircraft were under tower control.