Narrative:

I was the pilot monitoring for the approach. The captain/pilot flying (PF) had the autopilot and autothrottles engaged and had intercepted the ILS. At approximately 1;500 feet we were visual with the runway so the captain disengaged the autopilot; however he was unable to get the master warning or autopilot disconnect aural siren to stop. He then reconnected the autopilot and unsuccessfully tried again to disconnect the autopilot; however the master warning and disconnect siren would not stop. I also unsuccessfully tried my disconnect switch. At approximately 1;000 AGL; the PF was getting high on the glideslope so I stated to him that he was 'high; fast and the 600 FPM rate of descent was not adequate.' he did not make any correction nor did he acknowledge me. I then said again; 'captain; did you hear me!' he stated that he did hear me and then initiated a correction. However; at approximately 600-700 AGL we were still approximately 145 KTS which was approximately 20K above planned approach speed (vref was 117 + 5K additive). He stated that he was fast and at 500 feet he intended to go around. At 500 feet we were approximately 15 knots above approach speed......I then called '500 feet; unstable.' he then said 'landing' and continued to land the airplane. It is of my observation that the approach was unstable at 500 feet by approximately 15 KTS fast. A go-around may have been more appropriate than landing the aircraft. However; given the distraction and hindrance to communications between PF and pm from the autopilot siren; and the fact that there were thunderstorms 7NM off the departure end of the runway; we landed the aircraft.

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Original NASA ASRS Text

Title: While shooting an ILS approach in stormy weather the flight crew of a B757-200 was distracted by the autopilot disconnect siren that failed to silence after disengaging the autopilot. The approach became unstable but; after considering a go-around; they elected to land due to the distractions of the still blaring siren and the presence of thunderstorms in the area.

Narrative: I was the pilot monitoring for the approach. The Captain/pilot flying (PF) had the autopilot and autothrottles engaged and had intercepted the ILS. At approximately 1;500 feet we were visual with the runway so the Captain disengaged the Autopilot; however he was unable to get the Master Warning or Autopilot Disconnect aural siren to stop. He then reconnected the autopilot and unsuccessfully tried again to disconnect the autopilot; however the master Warning and Disconnect Siren would not stop. I also unsuccessfully tried my disconnect switch. At approximately 1;000 AGL; the PF was getting high on the glideslope so I stated to him that he was 'high; fast and the 600 FPM rate of descent was not adequate.' He did not make any correction nor did he acknowledge me. I then said again; 'Captain; did you hear me!' He stated that he did hear me and then initiated a correction. However; at approximately 600-700 AGL we were still approximately 145 KTS which was approximately 20K above planned approach speed (Vref was 117 + 5K Additive). He stated that he was fast and at 500 feet he intended to go around. At 500 feet we were approximately 15 knots above approach speed......I then called '500 feet; unstable.' He then said 'landing' and continued to land the airplane. It is of my observation that the approach was unstable at 500 feet by approximately 15 KTS fast. A go-around may have been more appropriate than landing the aircraft. However; given the distraction and hindrance to communications between PF and PM from the autopilot Siren; and the fact that there were thunderstorms 7NM off the departure end of the runway; we landed the aircraft.

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.