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Large transport encounters severe turbulence and heavy rain, radios fade and radar intermittent. Controller unable to hear request for vector out of WX. Airspeed drops, must sacrifice altitude for speed.
| Attributes | |
| ACN | 211470 |
| Time | |
| Date | 199205 |
| Day | Fri |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : lbl |
| State Reference | KS |
| Altitude | msl bound lower : 37500 msl bound upper : 39000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zkc |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : second officer |
| Qualification | pilot : cfi pilot : commercial pilot : flight engineer pilot : instrument |
| Experience | flight time last 90 days : 120 flight time total : 4200 flight time type : 890 |
| ASRS Report | 211470 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude inflight encounter : weather other anomaly other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course flight crew : regained aircraft control |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Weather |
| Air Traffic Incident | other |
Narrative:
While en route from sdf to abq; approximately 80 mi south of liberal, ks, we experienced severe turbulence and heavy rain. Our WX radar became intermittent and at the same time the radios began to fade. We asked ZKC for a radar vector out of the WX, however they were unable to receive us. During this time the turbulence became so severe that the airspeed dropped from 270 KIAS to 180 KIAS. It then became evident that we had to sacrifice altitude for airspeed in order to maintain aircraft control. The altitude momentarily went from assigned FL390 to 37500 ft. Eventually the turbulence subsided and we were able to maintain FL390. We soon established radio contact with ZKC and were able to resume normal operations.
Original NASA ASRS Text
Title: LGT ENCOUNTERS SEVERE TURB AND HVY RAIN, RADIOS FADE AND RADAR INTERMITTENT. CTLR UNABLE TO HEAR REQUEST FOR VECTOR OUT OF WX. AIRSPD DROPS, MUST SACRIFICE ALT FOR SPD.
Narrative: WHILE ENRTE FROM SDF TO ABQ; APPROX 80 MI S OF LIBERAL, KS, WE EXPERIENCED SEVERE TURB AND HVY RAIN. OUR WX RADAR BECAME INTERMITTENT AND AT THE SAME TIME THE RADIOS BEGAN TO FADE. WE ASKED ZKC FOR A RADAR VECTOR OUT OF THE WX, HOWEVER THEY WERE UNABLE TO RECEIVE US. DURING THIS TIME THE TURB BECAME SO SEVERE THAT THE AIRSPD DROPPED FROM 270 KIAS TO 180 KIAS. IT THEN BECAME EVIDENT THAT WE HAD TO SACRIFICE ALT FOR AIRSPD IN ORDER TO MAINTAIN ACFT CTL. THE ALT MOMENTARILY WENT FROM ASSIGNED FL390 TO 37500 FT. EVENTUALLY THE TURB SUBSIDED AND WE WERE ABLE TO MAINTAIN FL390. WE SOON ESTABLISHED RADIO CONTACT WITH ZKC AND WERE ABLE TO RESUME NORMAL OPS.
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.