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Near midair collision between arriving air carrier and departing twin float plane. Operation error and pilot deviation.
| Attributes | |
| ACN | 90287 |
| Time | |
| Date | 198807 |
| Day | Fri |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : jnu |
| State Reference | AK |
| Altitude | agl bound lower : 500 agl bound upper : 650 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : jnu |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | descent other landing other other |
| Route In Use | approach : circling |
| Flight Plan | VFR |
| Aircraft 2 | |
| Operator | common carrier : air taxi |
| Make Model Name | Small Transport |
| Flight Phase | climbout : takeoff climbout : initial |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 220 flight time total : 14000 |
| ASRS Report | 90287 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : nmac non adherence : required legal separation other spatial deviation |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | Other |
| Miss Distance | horizontal : 200 vertical : 150 |
| Supplementary | |
| Primary Problem | Ambiguous |
| Air Traffic Incident | Pilot Deviation Operational Error |
Narrative:
Air carrier X, returning on a VFR flight plan to juneau, was instructed to enter the traffic pattern on a downwind for a circle to land runway 26. Due to terrain this requires a constant 30 degree bank and in the landing confign from downwind turn right around to final (180 degree turn). Just before starting this turn jnu tower cleared a twin (Y) on floats to depart the adjacent float pond to the east (opposite the direction of traffic flown) at about 3/4 of the way thru our turn from downwind to final (30 degree bank, 800 to 1000 FPM descent in landing confign) we realized the twin was deviating northeast and crossing our approach course. We were able to stay above him but our sep was only 100 to 150' vertical and 200' horizontal. My recommendation is go with the flow.
Original NASA ASRS Text
Title: NMAC BETWEEN ARRIVING ACR AND DEPARTING TWIN FLOAT PLANE. OPERATION ERROR AND PLT DEVIATION.
Narrative: ACR X, RETURNING ON A VFR FLT PLAN TO JUNEAU, WAS INSTRUCTED TO ENTER THE TFC PATTERN ON A DOWNWIND FOR A CIRCLE TO LAND RWY 26. DUE TO TERRAIN THIS REQUIRES A CONSTANT 30 DEG BANK AND IN THE LNDG CONFIGN FROM DOWNWIND TURN RIGHT AROUND TO FINAL (180 DEG TURN). JUST BEFORE STARTING THIS TURN JNU TWR CLRED A TWIN (Y) ON FLOATS TO DEPART THE ADJACENT FLOAT POND TO THE EAST (OPPOSITE THE DIRECTION OF TFC FLOWN) AT ABOUT 3/4 OF THE WAY THRU OUR TURN FROM DOWNWIND TO FINAL (30 DEG BANK, 800 TO 1000 FPM DSCNT IN LNDG CONFIGN) WE REALIZED THE TWIN WAS DEVIATING NE AND XING OUR APCH COURSE. WE WERE ABLE TO STAY ABOVE HIM BUT OUR SEP WAS ONLY 100 TO 150' VERTICAL AND 200' HORIZONTAL. MY RECOMMENDATION IS GO WITH THE FLOW.
Data retrieved from NASA's ASRS site as of August 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.