 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
While maneuvering around WX at high altitude and high ambient temperature; CL65 decelerates and activates stall warning. Recovery requires maximum thrust and the loss of 250 feet of altitude.
| Attributes | |
| ACN | 796931 |
| Time | |
| Date | 200807 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : zfw.airport |
| State Reference | TX |
| Altitude | msl single value : 39000 |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zfw.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Regional Jet CL65 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 255 flight time total : 22000 flight time type : 5000 |
| ASRS Report | 796931 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude inflight encounter : weather non adherence : clearance other anomaly other anomaly |
| Independent Detector | aircraft equipment other aircraft equipment : stick shaker other flight crewa |
| Resolutory Action | flight crew : regained aircraft control |
| Supplementary | |
| Problem Areas | Aircraft Flight Crew Human Performance Weather |
| Primary Problem | Weather |
| Air Traffic Incident | Pilot Deviation |
Narrative:
While deviating around thunderstorms at night at FL390; with a tat of +4 degrees; I noticed the indicated airspeed decelerating at a fast rate. Within approximately 4 seconds the stick shaker activated. The aircraft was under 64000 pounds. I went to full power; recovered with an altitude loss of approximately 250 ft. I requested FL370. After the event; I checked the tat; it was at +15 degrees C. That tat with my weight would have put me into the ragged area for an altitude of FL390. I am wondering that with the sudden increase of outside air temperature; with possibly some windshear with the thunderstorms all around; could have caused the stick shaker.
Original NASA ASRS Text
Title: WHILE MANEUVERING AROUND WX AT HIGH ALT AND HIGH AMBIENT TEMPERATURE; CL65 DECELERATES AND ACTIVATES STALL WARNING. RECOVERY REQUIRES MAX THRUST AND THE LOSS OF 250 FEET OF ALT.
Narrative: WHILE DEVIATING AROUND TSTMS AT NIGHT AT FL390; WITH A TAT OF +4 DEGS; I NOTICED THE INDICATED AIRSPD DECELERATING AT A FAST RATE. WITHIN APPROX 4 SECONDS THE STICK SHAKER ACTIVATED. THE ACFT WAS UNDER 64000 LBS. I WENT TO FULL PWR; RECOVERED WITH AN ALT LOSS OF APPROX 250 FT. I REQUESTED FL370. AFTER THE EVENT; I CHKED THE TAT; IT WAS AT +15 DEGS C. THAT TAT WITH MY WT WOULD HAVE PUT ME INTO THE RAGGED AREA FOR AN ALT OF FL390. I AM WONDERING THAT WITH THE SUDDEN INCREASE OF OUTSIDE AIR TEMP; WITH POSSIBLY SOME WINDSHEAR WITH THE TSTMS ALL AROUND; COULD HAVE CAUSED THE STICK SHAKER.
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.