A md-11 at 5;000 feet; 205 knots with slats extended lost about 300 feet during a windshear airspeed...

Narrative:

The first officer was PF for arrival and planned monitored CAT3 approach for IOE training event exposure. During vectors for arrival; about 20 NM northeast the arrival airport while at 5;000 feet assigned and about 205 knots (200 knots assigned); straight and level flight; clean configuration with autopilot two (AP2) and autothrottle (ats) on; PF noticed speed decreasing to the foot (190 knots) and queried 'what's going on?' no windshear warning received and only occasional turbulence was encountered during the arrival. No convective weather apparent on the radar during arrival and descent; but heavy rain in the vicinity. Stick shaker activated and speed decreased to about 180 knots. The first officer disconnected the ap and ats; selected max power and descended some during the recovery resulting in 'altitude' callouts from the CAWS. Descent was never more than about 350 feet lower than assigned and overshoots to about 200 feet high on recovery. Aircraft gross weight at the time was approximately 370;000 lbs. Wing was clean with no speed brakes extended and we were not turning. Foot was about 190 knots. No limits were exceeded. Aircraft had been previously written up for anomalous stick shaker during climbout at about 190 knots. I would suggest immediate response rather than a query may have started the recovery sooner. Earlier configuration with slats would have increased the margin for minimum safe speed.

Original NASA ASRS Text

Title: A MD-11 at 5;000 feet; 205 knots with slats extended lost about 300 feet during a windshear airspeed decrease to about 185 knots with a stall warning while on approach in rain.

Narrative: The First Officer was PF for arrival and planned monitored CAT3 approach for IOE training event exposure. During vectors for arrival; about 20 NM northeast the arrival airport while at 5;000 feet assigned and about 205 knots (200 knots assigned); straight and level flight; clean configuration with autopilot two (AP2) and autothrottle (ATS) on; PF noticed speed decreasing to the foot (190 knots) and queried 'What's going on?' No windshear warning received and only occasional turbulence was encountered during the arrival. No convective weather apparent on the radar during arrival and descent; but heavy rain in the vicinity. Stick shaker activated and speed decreased to about 180 knots. The First Officer disconnected the AP and ATS; selected max power and descended some during the recovery resulting in 'altitude' callouts from the CAWS. Descent was never more than about 350 feet lower than assigned and overshoots to about 200 feet high on recovery. Aircraft gross weight at the time was approximately 370;000 lbs. Wing was clean with no speed brakes extended and we were not turning. Foot was about 190 knots. No limits were exceeded. Aircraft had been previously written up for anomalous stick shaker during climbout at about 190 knots. I would suggest immediate response rather than a query may have started the recovery sooner. Earlier configuration with slats would have increased the margin for minimum safe speed.

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.

Attributes
ACN	1082104
Time
Date	201304
Local Time Of Day	0001-0600
Place
Locale Reference	ZZZ.TRACON
State Reference	US
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Make Model Name	MD-11
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Flight Plan	IFR
Person 1
Function	Check Pilot Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	First Officer Pilot Flying
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Altitude Excursion From Assigned Altitude Deviation - Altitude Overshoot Deviation - Procedural Published Material / Policy Inflight Event / Encounter Loss Of Aircraft Control Inflight Event / Encounter Weather / Turbulence

A md-11 at 5;000 feet; 205 knots with slats extended lost about 300 feet during a windshear airspeed decrease to about 185 knots with a stall warning while on approach in rain.