Close-Up: Aeroperu 603 – Alarms Activity From Voice Recorder

Editorial Staff

Monday, April 28, 1997 at 12:00 AM ET

Verified

Key Takeaways:

The voice recorder captured a prolonged and escalating sequence of diverse aircraft system alarms, including initial windshear, rudder ratio, and mach trim warnings.
The flight experienced a relentless barrage of critical alerts such as overspeed, stall warning, altitude, and "Sink Rate" warnings, indicating severe control and operational issues.
Mechanical voice alerts, notably "Too Low Terrain" and "Windshear," became frequent and persistent in the final minutes, signaling extreme proximity to the ground and environmental hazards.
The recording culminates with continuous critical warnings immediately followed by two distinct sounds of impact, indicating the catastrophic end of the flight.

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Aeroperu 603 (Boeing 757)

Alarms Activity From Voice Recorder

October 2, 1996 – Lima, Peru

01:57 — Windshear Alarm – Three Times

02:49 — Rudder Ratio Alarm

03:14 — Mach Trim

04:02 — Caution Alarm

04:05 — Alert Alarm

04:54 — Auto Throttle Disconnect, Rudder Ratio & Mach Speed Trim

05:42 — A One Hertz Sound Begins And Remains

09:56 — Alert

10:04 — Unknown Sound

10:17 — Sound Similar To Alert

11:43 — Sound Similar To Alert

14:33 — Sound Similar To Alert

14:50 — Caution Alarm

16:53 — Alert Sound For 10 Seconds

16:55 — Overspeed Alarm

18:08 — Sound Of Beat

18:52 — Two Tone Over Speed Alarm (Will Keep On Until The End Of The Recording)

19:10 — Stall Warning Alarm

19:18 — Stall Warning Alarm

19:24 — Stall Warning Alarm

19:29 — Stall Warning Alarm

20:59 — Double Alert Alarm

22:17 — Alert Alarm

22:27 — Mechanical Alert Voice “Too Low Terrain” (For 45 Seconds, 22 Times)

23:03 — Mechanical Voice Of “Windshear” Alarm (Three Times)

23:07 — Mechanical Alert Voice “Too Low Terrain” (For 15 Seconds)

23:14 — Mechanical Voice Of “Windshear” Alarm (Three Times)

23:40 — Sound Of Alert Alarm

24:07 — Mechanical Alert Voice “Sink Rate” (Four Times) Plus Alert Alarm

27:50 — Caution Alarm

28:24 — Altitude Alarm

29:26 — Caution Alarm

29:33 — Caution Alarm

29:42 — Caution Alarm

29:53 — Caution Alarm

30:00 — Mechanical Voice “Too Low Terrain” (Remains Until The End Of Recording)

30:04 — Caution Alarm

30:40 — Sound Of Impact

30:41 — Caution Alarm

30:50 — Mechanical Voice Sound “Too Low Terrain” Stops

30:56 — Caution Alarm

30:57 — Mechanical Voice “Whoop… Whoop… Pu…”

30:59 — Sound Of Impact