B767 flight crew and the pct controller involved describe the events surrounding a near midair colli...

Attributes
ACN	967197
Time
Date	201108
Local Time Of Day	0601-1200
Place
Locale Reference	PCT.TRACON
State Reference	VA
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	B767-300 and 300 ER
Operating Under FAR Part	Part 121
Flight Phase	Descent
Route In Use	STAR HYPER 2
Aircraft 2
Make Model Name	Cessna Aircraft Undifferentiated or Other Model
Flight Plan	VFR
Person 1
Function	Pilot Not Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 245 Flight Crew Total 19000 Flight Crew Type 3500
Person 2
Function	Relief Pilot Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 220 Flight Crew Total 7000 Flight Crew Type 3000
Events
Anomaly	Conflict NMAC

Narrative:

We were cleared to descend via the hyper 2 RNAV arrival into iad. Descending through about 7;600 ft at 1;000 FPM to cross sigbe at 7;000; we were issued VFR cessna traffic at 7;500 (1 o'clock and 2 miles maybe). As we did not have target acquisition; I instructed the first officer to increase his rate of descent through 7;500 ft. We received and the pilot flying complied with a descend RA followed by monitor vertical speed RA. We visually acquired the target and watched him fly directly overhead 300 ft above our altitude. (300 ft vertical separation and 0 horizontal separation.) we reported the descend RA to ATC; reported clear; and advised ATC we would be filing a near midair collision report. The pilot flying complied smoothly and timely with the RA; and the event was invisible to the passengers. We were on a direct collision course with the cessna. We do not know if we would have had visual contact in time to maneuver; TCAS likely prevented a collision.

Original NASA ASRS Text

Title: B767 flight crew and the PCT Controller involved describe the events surrounding a NMAC over SIGBE on the HYPER2 RNAV arrival to IAD.

Narrative: We were cleared to descend via the HYPER 2 RNAV Arrival into IAD. Descending through about 7;600 FT at 1;000 FPM to cross SIGBE at 7;000; we were issued VFR Cessna traffic at 7;500 (1 o'clock and 2 miles maybe). As we did not have target acquisition; I instructed the First Officer to increase his rate of descent through 7;500 FT. We received and the pilot flying complied with a Descend RA followed by Monitor Vertical Speed RA. We visually acquired the target and watched him fly directly overhead 300 FT above our altitude. (300 FT Vertical Separation and 0 Horizontal Separation.) We reported the Descend RA to ATC; reported clear; and advised ATC we would be filing a NMAC report. The pilot flying complied smoothly and timely with the RA; and the event was invisible to the passengers. We were on a direct collision course with the Cessna. We do not know if we would have had visual contact in time to maneuver; TCAS likely prevented a collision.

Data retrieved from NASA's ASRS site as of April 2012 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.

B767 flight crew and the pct controller involved describe the events surrounding a near midair collision over sigbe on the HYPER2 RNAV arrival to iad.