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An MD80 flight crew slowed below assigned airspeed on final approach because they felt it was safer to do so given the turbulence and wind conditions.
| Attributes | |
| ACN | 817045 |
| Time | |
| Date | 200812 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Environment | |
| Flight Conditions | IMC |
| Weather Elements | Turbulence Fog |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : zzz.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Series (DC-9-80) Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | ils localizer & glide slope : xx |
| Flight Phase | descent : approach |
| Route In Use | approach : instrument precision |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : private pilot : multi engine pilot : flight engineer pilot : commercial pilot : atp pilot : instrument |
| Experience | flight time last 90 days : 240 flight time total : 11900 flight time type : 9500 |
| ASRS Report | 817045 |
| Events | |
| Anomaly | inflight encounter : turbulence non adherence : clearance other anomaly |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : unable |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Weather |
| Primary Problem | Flight Crew Human Performance |
Narrative:
Inbound on GS to runway xx at ZZZ; assigned to fly 180 KIAS to the FAF. Descending on glide path; had a 55 KT right quartering crosswind; moderate turbulence; autopilot aural warning 'stabilizer' because it couldn't control pitch on GS at that speed; configured; in turbulence. At that point; it was clear the autopilot was about to disconnect and hand us an untrimmed; slow; dirty; descending aircraft on GS in moderate turbulence. So in the interest of safety we immediately slowed so as to be configured and stabilized at the FAF. The radio traffic was so heavy we couldn't notify ATC of our condition before we passed the FAF. We had a category I aircraft due to a placarded radio altimeter. Ceiling was 200 ft with an RVR of 5;000 ft. We knew we had 1 approach due to fuel; and then we would have to divert. We were intent on a safe; stable approach in the proper configuration and speed at the FAF. After landing; approach notified us that we were being violated for 'deviating from fars.
Original NASA ASRS Text
Title: An MD80 flight crew slowed below assigned airspeed on final approach because they felt it was safer to do so given the turbulence and wind conditions.
Narrative: Inbound on GS to Runway XX at ZZZ; assigned to fly 180 KIAS to the FAF. Descending on glide path; had a 55 KT right quartering crosswind; moderate turbulence; autopilot aural warning 'STAB' because it couldn't control pitch on GS at that speed; configured; in turbulence. At that point; it was clear the autopilot was about to disconnect and hand us an untrimmed; slow; dirty; descending aircraft on GS in moderate turbulence. So in the interest of safety we immediately slowed so as to be configured and stabilized at the FAF. The radio traffic was so heavy we couldn't notify ATC of our condition before we passed the FAF. We had a Category I aircraft due to a placarded radio altimeter. Ceiling was 200 FT with an RVR of 5;000 FT. We knew we had 1 approach due to fuel; and then we would have to divert. We were intent on a safe; stable approach in the proper configuration and speed at the FAF. After landing; Approach notified us that we were being violated for 'deviating from FARs.
Data retrieved from NASA's ASRS site as of May 2009 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.