HOW ELT HELPS IN SEARH AND RESCUE OF LOST AIRCRAFT | EMERGENCY LOCATOR TRANSMITTER | EASA

Aircrafts are equipped with emergency devices that are capable of transmitting the location of aircraft in case the aircraft crashes. These devices help the search and rescue team to locate the lost aircraft under sea, mountains, thick forest or in far away islands.
These devices are called ELTs or Emergency Locator transmitters.
In the event of an aircraft accident, these devices are designed to transmit a distress signal on 121.5 and 243.0 MHz frequencies, and for newer ELTs, on 406 MHz.
Working of ELT: How Emergency Locator transmitter Works?
In case of an aircraft crash, the ELTs is activated depending upon the type of ELT installed in the aircraft. There are generally two types of ELTs installed in the commercial aircrafts,
Automatic Impact type and Survival or immersion type.
The impact type ELT is the automatically activated whenever the aircraft experiences very high velocity or large g forces due to the crash. It contains G sensors that activates the circuit at a certain threshold.
The immersion type ELT is activated when the aircraft crashes in sea and the ELT body is dipped IN water. The presence of water completes the activation circuit and the ELT starts transmitting the distress signals. This type of ELT can also be activated by any person (either crew or passenger) who survived the crash simply by the putting the ELT in water or by manually activating it using the front panel switch.
The transmitters will operate continuously for at least 48 hours over a wide temperature range.
After being activated, the ELT transmits distress signals on 121.5 and 243 MHz frequencies. These signals can be received by the ATC or by nearby Aircrafts. That is why the pilots are always encouraged to listen to these frequencies and take necessary actions. The 406 Mhz signal is received by the Satellite. The Cospas-Sarsat system has announced the termination of satellite monitoring and reception of the 121.5 MHz and 243.0 MHz frequencies in 2009.
The satellite receivers send this information to ground stations to calculate the location of the emergency signals.
The Mission control center then expedite the search and rescue operation
LOCTION AND NUMBER OF ELTS INSTALLED IN THE AIRCRAFT CAN BE FOUND ON THE EMERGENCY EQUIPMENT CHART.
The international civil aviation authority imposes certain regulations on keeping an ELT on board the aircraft .
On all Commercial air transport:
All airplanes operated on long range over water flights shall be equipped with at least two ELTs. and
-All airplanes overflying land areas considered by the State concerned to be
difficult for search and rescue shall be equipped with at least one ELT.
Your National Civil aviation authority may impose other conditions such as
The Airplane must be equipped with Emergency Locator Transmitters when flying further than 120 minutes or 400NM from an airfield.
THE IMPCT TYPE TRANSMITTER IS LOCATED IN THE PRSSURIZED AREA AND IS ATTACHED TO THE CEILING, IN THE AFT FUSELAGE LONGITUDINAL CENTRELINE .
The transmitter operates with lithium manganese dioxide batteries AND does not use airplane power.
Testing the ELT:
ELTs should only be tested during the first 5 minutes after any hour. If operational tests must be made outside of this period, they should be coordinated with the nearest FAA Control Tower.
Airborne tests are not authorized
A properly installed, maintained, and functioning ELT can expedite search and rescue operations and save lives if it survives the crash and is activated. Pilots and their passengers should know how to activate the aircraft's ELT if manual activation is required. They should also be able to verify the aircraft's ELT is functioning and transmitting an alert after a crash or manual activation.
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[@TheNadeem00786]

Sir, very informative. Very motivational lecture for new aircraft engineers.

[@allhailalona]

very good work!!

[@conned]

Chewing curd? Nice .. VL g😊

[@WaseemShah-sb8tt]

Very informative video admin keep up the good work

[@sandeshsawant6475]

Explanation 👌👌

[@yasirsaeed2815]

💛

[@rodrigomartinso.s.9902]

What language is that? It has some words similar to English.

[@ilikeballsbenusknakus]

You serious? Its english with an Indian accent