A flight deck indication that a fixed fire extinguisher has been fired is a low pressure warning lamp. When the fire extinguishant is discharged, the drop in pressure activates a low pressure electrical switch. This switch then illuminates a ‘DISCH’ caption on the flight deck, indicating that the bottle’s contents have been released into the fire zone.

In aircraft engine fire protection systems, Halon (a type of Freon) is commonly used because it is highly effective, leaves no residue, and is safe for use in confined spaces without damaging engine components.

An engine fire extinguisher that has discharged due to an over-temperature condition will be indicated by an externally mounted discharge indicator showing red. This occurs because an external green disc is ejected, revealing a red disc underneath, which signifies that the bottle’s contents have been released overboard due to thermal discharge.

On a multi-engined aircraft, an engine fire warning system typically consists of a steady red fire warning light for the specific engine affected. This visual alert is accompanied by a common warning bell or a continuous repetitive chime, designed to grab the flight crew’s attention effectively without being startling.

Smoke detectors are fitted in areas not under constant surveillance, including cargo bays, electrical equipment bays, and toilets. They provide remote warnings of smoke or overheat conditions to the flight deck.

A short circuit in a resistive “fire wire” detector will cause a spurious fire warning to be received. This happens because the temperature-sensitive insulating material’s resistance decreases, mimicking an overheat condition.

On receipt of an engine fire warning, the correct procedure dictates that you shut down the affected engine first. Following this, you pull the fire handle and then fire the first extinguisher into the engine fire zone to discharge the extinguishant.

Aircraft fire detection systems are designed so that the crew can test their functionality from the flight deck, ensuring the circuits and sensors are operational before and during flight.

Toilet fire extinguishers are heat-activated (often using a fusible link) so they discharge automatically when a high temperature is detected near the waste bin or designated protected area.

Regulations require emergency exits to be clearly marked externally with a contrasting colour band (typically about 2 inches wide) to ensure they are easily identifiable in an emergency.

Regulations on fitting, marking, and use of safety equipment are in Joint Airworthiness Requirements (JARs). EU-OPS Subpart K provides specifics for emergency oxygen, protective breathing equipment, and fire extinguishers.

Aviation regulations require emergency lighting to remain illuminated for at least 10 minutes to allow safe evacuation of passengers after loss of normal electrical power.

A flashing LED at 4-second intervals on an emergency torch is a built-in test feature indicating that the torch is operational and ready for use.

Nomex gloves are heat- and flame-resistant, designed to protect crew members’ hands when handling hot objects or during firefighting situations on the flight deck.

The Vital DC bus-bar supplies power to critical systems, including emergency lighting, ensuring they remain functional even during severe electrical failures.

Emergency lighting includes illumination for the flight deck, passenger cabin interior, and external areas (like exits and slides) to ensure safe evacuation and operations during emergencies.

A cut-in area, also known as a break-in point, is a designated fuselage area for emergency rescue access. These areas are delineated by external markings with right-angled corners, typically red or yellow, and may be outlined in white for contrast. Their purpose is to facilitate safe entry for rescue crews.