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Md-11 captain reported momentary stick shaker while retracting slats during initial climb after a heavy weight takeoff.
| Attributes | |
| ACN | 1102338 |
| Time | |
| Date | 201307 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | RKSI.Airport |
| State Reference | FO |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | MD-11 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Climb |
| Flight Plan | IFR |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 72 Flight Crew Total 8708 Flight Crew Type 2100 |
| Events | |
| Anomaly | Deviation - Speed All Types Inflight Event / Encounter Weather / Turbulence |
Narrative:
Conditions: night; IMC (200/3v260-360g24; 2 sct 3 broken 120 ovc) heavy 611.0 takeoff: max thrust/flaps 15 (weight and gusts) V1 145/vr 176/V2 183/vfr 193/vsr 251/vcl 283 clearance: runway 15R ENKAS1K 10;000 ft takeoff and initial climb normal approaching SI704 aircraft was reaching the vsr of 251. SI704 requires a nearly 90 degree turn so with consideration of the weight and light turbulence I opted to delay slat retraction and flew the turn at between 255-260 KTS. Rolling out of the turn on track to junha; I called for slats retract at approximately 260 KTS with a positive airspeed trend vector displayed and the bank was rolling from 10 degrees to wings level. At approximately 5 degrees of bank we received a momentary stick shaker of 2-3 seconds duration. We were boxed up against the pli. I lowered the nose 2-3 degrees added some thrust and the stick shaker ceased. I continued acceleration to vcl of 283. There was no auto slat extension or 'red' on the airspeed tape. Leveling off at 10;000 at vcl 283 we received a secondary momentary stick shaker in light to moderate turbulence. I dialed the speed up to 300 KTS and there were no further stick shaker warnings. In summary the aircraft was heavy; there was some turbulence and the SID required maneuvering. The stall activation I believe was a function of these variables and the thin margins available with this weight. At no time was there concern about aircraft control or energy state.
Original NASA ASRS Text
Title: MD-11 Captain reported momentary stick shaker while retracting slats during initial climb after a heavy weight takeoff.
Narrative: Conditions: Night; IMC (200/3V260-360G24; 2 SCT 3 BKN 120 OVC) Heavy 611.0 Takeoff: Max Thrust/Flaps 15 (weight and gusts) V1 145/Vr 176/V2 183/Vfr 193/Vsr 251/Vcl 283 Clearance: RWY 15R ENKAS1K 10;000 FT takeoff and initial climb normal approaching SI704 aircraft was reaching the Vsr of 251. SI704 requires a nearly 90 degree turn so with consideration of the weight and light turbulence I opted to delay slat retraction and flew the turn at between 255-260 KTS. Rolling out of the turn on track to JUNHA; I called for SLATS RETRACT at approximately 260 KTS with a positive airspeed trend vector displayed and the bank was rolling from 10 degrees to wings level. At approximately 5 degrees of bank we received a momentary stick shaker of 2-3 seconds duration. We were boxed up against the PLI. I lowered the nose 2-3 degrees added some thrust and the stick shaker ceased. I continued acceleration to Vcl of 283. There was no Auto Slat Extension or 'Red' on the Airspeed Tape. Leveling off at 10;000 at Vcl 283 we received a secondary momentary stick shaker in light to moderate turbulence. I dialed the speed up to 300 KTS and there were no further stick shaker warnings. In summary the aircraft was heavy; there was some turbulence and the SID required maneuvering. The stall activation I believe was a function of these variables and the thin margins available with this weight. At no time was there concern about aircraft control or energy state.
Data retrieved from NASA's ASRS site as of July 2013 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.