B757 crew received a momentary stick shaker with speed brakes extended on approach to las.

Attributes
ACN	622292
Time
Date	200306
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : las.airport
State Reference	NV
Altitude	msl single value : 8000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : l30.tracon tower : zzz.tower
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : intermediate altitude descent : approach
Route In Use	approach : visual arrival star : lynsy
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : l30.tracon
Operator	common carrier : air carrier
Make Model Name	A321
Operating Under FAR Part	Part 121
Flight Phase	descent : intermediate altitude descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 155 flight time total : 23000 flight time type : 350
ASRS Report	622292
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	non adherence : company policies other anomaly other anomaly
Independent Detector	aircraft equipment other aircraft equipment : stick shaker other flight crewa other flight crewb
Resolutory Action	flight crew : overrode automation
Consequence	other
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance Aircraft
Primary Problem	Flight Crew Human Performance

Narrative:

VFR WX arrival into las. We were kept very high on lynsy 2 arrival ILS runway 25L for traffic we were to follow to runway. Approach advised 'descend to 8000 ft, slow to 190 KTS, advise traffic (an A321) and runway in sight for visual' while we were on vector for final. With speed brakes and flaps we complied with a rapid descent and slowing to 190 KTS. We spotted traffic, but due to radio congestion we were unable to advise that traffic and airport in sight. Just prior to 8000 ft leveloff received 'slow to 170 KTS, cleared visual to runway 25L reference traffic.' aircraft autoplt and mode control panel in use. I used heading select to start turn to final. While aircraft started to level, I disconnected autoplt to start descent to GS. While adding power and retracting speed brakes we received a momentary stick shaker. Had I retracted speed brakes earlier, we would not have received shaker, because speed was more than ample for flaps 20 degrees. Balance of approach was stable as we returned to GS and made normal landing.

Original NASA ASRS Text

Title: B757 CREW RECEIVED A MOMENTARY STICK SHAKER WITH SPD BRAKES EXTENDED ON APCH TO LAS.

Narrative: VFR WX ARR INTO LAS. WE WERE KEPT VERY HIGH ON LYNSY 2 ARR ILS RWY 25L FOR TFC WE WERE TO FOLLOW TO RWY. APCH ADVISED 'DSND TO 8000 FT, SLOW TO 190 KTS, ADVISE TFC (AN A321) AND RWY IN SIGHT FOR VISUAL' WHILE WE WERE ON VECTOR FOR FINAL. WITH SPD BRAKES AND FLAPS WE COMPLIED WITH A RAPID DSCNT AND SLOWING TO 190 KTS. WE SPOTTED TFC, BUT DUE TO RADIO CONGESTION WE WERE UNABLE TO ADVISE THAT TFC AND ARPT IN SIGHT. JUST PRIOR TO 8000 FT LEVELOFF RECEIVED 'SLOW TO 170 KTS, CLRED VISUAL TO RWY 25L REF TFC.' ACFT AUTOPLT AND MODE CTL PANEL IN USE. I USED HDG SELECT TO START TURN TO FINAL. WHILE ACFT STARTED TO LEVEL, I DISCONNECTED AUTOPLT TO START DSCNT TO GS. WHILE ADDING PWR AND RETRACTING SPD BRAKES WE RECEIVED A MOMENTARY STICK SHAKER. HAD I RETRACTED SPD BRAKES EARLIER, WE WOULD NOT HAVE RECEIVED SHAKER, BECAUSE SPD WAS MORE THAN AMPLE FOR FLAPS 20 DEGS. BAL OF APCH WAS STABLE AS WE RETURNED TO GS AND MADE NORMAL LNDG.

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.