Narrative:

We were cleared for the visual approach; planning a flaps 45 landing. We were on a right base. [Captain] slowed to 145 knots and called for flaps 45. I selected flaps 45. [Captain] then said 'give me my ILS'. I thought she was requesting a pvor because that is our normal operating procedure. I went heads down and gave her a pvor. When I returned to the pfd we were at the top of the red tape on the IAS and in a right turn base to final. I exclaimed '[captain]; watch your speed'. At that point the shaker was activated. [Captain] added power pitched down and leveled the bank some. The aircraft was stabilized and the remainder of the approach was flown in a stabilized manner. Once stabilized in a cross check I noticed her course on her ILS was not properly aligned. I reached over and aligned her course.I noticed the airspeed deviation and brought it to [captain]'s attention immediately. Our speed was at 107-108 knots approximately 20 knots below vref.[captain] did not increase the thrust after getting flaps 45. I was heads down and did not notice the airspeed deviation until just before the shaker.power was added; the nose was pitched down and the bank angle was reduced.this was classic getting too slow on base to final. It went unnoticed by myself because I was heads down. Now when flaps are called for in landing (especially 45 degrees). I do not leave the pfd until I see that the pilot flying has stabilized the speed.

Google
 

Original NASA ASRS Text

Title: EMB-145LR First Officer reported receiving a stick shaker in the landing pattern when the Captain (flying pilot) allowed speed to drop following flap extension.

Narrative: We were cleared for the visual approach; planning a flaps 45 landing. We were on a right base. [Captain] slowed to 145 knots and called for flaps 45. I selected flaps 45. [Captain] then said 'give me my ILS'. I thought she was requesting a PVOR because that is our normal operating procedure. I went heads down and gave her a PVOR. When I returned to the PFD we were at the top of the red tape on the IAS and in a right turn base to final. I exclaimed '[Captain]; watch your speed'. At that point the shaker was activated. [Captain] added power pitched down and leveled the bank some. The aircraft was stabilized and the remainder of the approach was flown in a stabilized manner. Once stabilized in a cross check I noticed her course on her ILS was not properly aligned. I reached over and aligned her course.I noticed the airspeed deviation and brought it to [Captain]'s attention immediately. Our speed was at 107-108 knots approximately 20 knots below Vref.[Captain] did not increase the thrust after getting flaps 45. I was heads down and did not notice the airspeed deviation until just before the shaker.Power was added; the nose was pitched down and the bank angle was reduced.This was classic getting too slow on base to final. It went unnoticed by myself because I was heads down. Now when flaps are called for in landing (especially 45 degrees). I do not leave the PFD until I see that the pilot flying has stabilized the speed.

Data retrieved from NASA's ASRS site 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.