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Multiple runway operation parallel runways air carrier X non adherence to ATC instruction speed had possible less than standard separation from widebody transport wake turbulence. Possible system error. Pilot deviation.
| Attributes | |
| ACN | 245318 |
| Time | |
| Date | 199307 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : den |
| State Reference | CO |
| Altitude | msl bound lower : 8000 msl bound upper : 8000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : den |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 9000 flight time type : 800 |
| ASRS Report | 245318 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : ground critical non adherence : published procedure non adherence : required legal separation non adherence : clearance other anomaly other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | other |
| Consequence | Other |
| Miss Distance | horizontal : 18000 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Operational Error Pilot Deviation |
Narrative:
Air carrier X on approach to den runway 26L we were vectored to 3 mi behind a widebody transport. The controller cleared us for a visual approach to runway 26L and instructed us to increase speed. This would have compromised the separation even more. I told the PF to slow to maintain wake turbulence separation. Runway 26L is staggered from runway 26R, with runway 26R being further downfield. Widebody transport's should not be given runway 26R unless 5 mi of separation exists since the runway 26L aircraft must fly well above the GS to stay out of the wake turbulence. This procedure of vectoring with less than required separation is common at den and sfo and should be discouraged. This is a clear violation of 7110.65 5-72(B).
Original NASA ASRS Text
Title: MULTIPLE RWY OP PARALLEL RWYS ACR X NON ADHERENCE TO ATC INSTRUCTION SPD HAD POSSIBLE LTSS FROM WDB WAKE TURB. POSSIBLE SYS ERROR. PLTDEV.
Narrative: ACR X ON APCH TO DEN RWY 26L WE WERE VECTORED TO 3 MI BEHIND A WDB. THE CTLR CLRED US FOR A VISUAL APCH TO RWY 26L AND INSTRUCTED US TO INCREASE SPD. THIS WOULD HAVE COMPROMISED THE SEPARATION EVEN MORE. I TOLD THE PF TO SLOW TO MAINTAIN WAKE TURB SEPARATION. RWY 26L IS STAGGERED FROM RWY 26R, WITH RWY 26R BEING FURTHER DOWNFIELD. WDB'S SHOULD NOT BE GIVEN RWY 26R UNLESS 5 MI OF SEPARATION EXISTS SINCE THE RWY 26L ACFT MUST FLY WELL ABOVE THE GS TO STAY OUT OF THE WAKE TURB. THIS PROC OF VECTORING WITH LESS THAN REQUIRED SEPARATION IS COMMON AT DEN AND SFO AND SHOULD BE DISCOURAGED. THIS IS A CLR VIOLATION OF 7110.65 5-72(B).
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.