Here are some enhanced and much more realistic Alerts, GPWS sounds and what for they are in the BOEING 777. All sounds are from REAL Boeing recordings and videos.

General alerting sounds are chosen by the manufacturer of the cockpit systems. Stall warnings, autopilot disconnect alerts, fire alarms etc. are all not standardised, with the exception of the words spoken by the GPWS/TAW and TCAS system.
Whilst the exact sounds of these two systems are not standardised in the sense that a standard. wav file is to used by all manufacturers, the phraseology in their aural alerts is standard.
The system monitors an aircraft’s height above ground as determined by a radar altimeter. A computer then keeps track of these readings, calculates trends, and will warn the flight crew with visual and audio messages if the aircraft is in certain defined flying configurations (“modes”).

The modes are:

  1. Excessive descent rate (“SINK RATE” “PULL UP”)
  2. Excessive terrain closure rate (“TERRAIN” “PULL UP”)
  3. Altitude loss after takeoff or with a high power setting (“DON’T SINK”)
  4. Unsafe terrain clearance (“TOO LOW – TERRAIN” “TOO LOW – GEAR” “TOO LOW – FLAPS”)
  5. Excessive deviation below glideslope (“GLIDESLOPE”)
  6. Excessively steep bank angle (“BANK ANGLE”)
  7. Windshear protection (“WINDSHEAR”)

Here are some of the sounds made by various cockpit warnings.

Engine or APU fire: FARs require that engine and APU fires be indicated by a bell accompanied by red fire warning lights. No other cockpit warning uses the bell sound.
Stall: Approach to stall is indicated by a stick shaker, which physically vibrates both control columns, creating a rattling or shaking sound when aircraft speed is a minimum of 7 percent above the actual stall speed. Some stall warning systems also generate synthetic voice warnings (“Stall!”) to indicate an approaching stall.
Overspeed: An overspeed “clacker” sounds when a limiting mach or airspeed is exceeded. Some aircraft also combine clackers with synthetic voice warnings that further clarify what speed is being exceeded (e.g., “Slat overspeed! Flap overspeed!”).
Autopilot disconnect: Various kinds of siren, klaxon, or chime sounds, accompanied by red warning lights, signal that the autopilot has disconnected. On some aircraft, warning lights illuminate, but there are no aural warning sounds.
Stabilizer trim movement: On some aircraft continuous beeping or clicking sounds indicate that stabilizer trim is operating. Others, such as the Boeing 757, have no aural indication of trim movement.
Landing gear: A horn sounds and appropriate gear position indicator lights illuminate when an unsafe gear configuration exists. Once landing flaps have been selected, the horn normally cannot be silenced until the landing gear is properly extended.
Altitude alerter: A single chime or other distinctive tone, accompanied by a light, alerts pilots when they are leaving the current altitude or approaching a new one. Some alerter designs omit the tone, utilizing only the light itself.
Configuration warning: An intermittent horn or beeping tone warns when flaps, slats, stabilizer trim, or speed brakes are improperly configured prior to takeoff.
Pressurization: A continuous horn, accompanied by a red warning light in some aircraft, warns of loss of normal cabin pressure.
TCAS: A variety of voice warnings and visual displays warn pilots of traffic conflicts.
GPWS: Various voice warnings and attention-getting “Whoop, Whoop!” sounds warn of potentially dangerous situations, such as descent towards terrain when not in the landing configuration.

Author: TECH SINGH Urs


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