ELT Control Panel

EMERGENCY LOCATOR TRANSMITTER SYSTEM

(For ILF 401, 406-409, 410, 423-429, 451, 504, 507-509, 510, 515-517, 519, 520-527)

Purpose

The emergency locator transmitter (ELT) system automatically sends emergency signals when it senses a large change in the airplane velocity.

The ELT sends homing signals to search and rescue crews on the VHF and UHF emergency channels.

The ELT also sends emergency signals to satellite receivers. The satellite receivers send this information to ground stations to calculate the location of the emergency signals.

Abbreviations and Acronyms

· ANT - antenna

· C - Celsius

· cm - centimeter

· dc - direct current

· deg - degree

· ELT - emergency locator transmitter

· EXT - external

· in - inch

· kg - kilogram

· lb - pound

· MHz - megahertz

· mW - milliwatt

· UHF - ultra high frequency

· VHF - very high frequency

· v – volt

General

The emergency locator transmitter (ELT) system has these components:

· Control panel

· Transmitter

· Antenna.

The control panel has a switch that you use to start the ELT manually. It also has a light to show you that the ELT is in operation.

The ELT transmitter has two transmitter sections. One transmitter sends a swept tone on the VHF and UHF emergency channels (121.5 and 243.0 MHz). The other

transmitter sends digital data every 50 seconds on the 406 MHz channel.

The antenna sends the 121.5/243.0 MHz and the 406 MHz transmit signals.

Flight Compartment

The ELT control panel is on the P5 aft overhead panel.

Passenger Cabin

The ELT transmitter is above an access panel in the aft passenger cabin ceiling at station 770.

Fuselage

The ELT antenna is on top of the fuselage, above and aft of the ELT transmitter at station 797.

Power

The emergency locator transmitter (ELT) control panel gets 28v dc or 16v dc from the master dim and test (MD&T) circuit. This power is for the ELT light.

The ELT uses an internal battery pack. The battery pack has four D size lithium manganese dioxide cells. The cells connect in series to supply 6v dc to the ELT.

ELT Control Panel

The ELT control panel sends an EXT ON signal to the ELT to start the transmitter. It also sends reset signals to stop the transmitter if it accidentally starts.

The control panel gets the LIGHT signal from the ELT to control the ELT light. It also gets an ELT ON signal to turn on the master caution.

Дата добавления: 2015-10-24