Y1-06-0130 Rev. B
Page 3 of 9
1.0 GENERAL DESCRIPTION
The Model SRB-406 Emergency Locator Transmitter (ELT) is a survival-type transmitter
manufactured for use on aviation life rafts. The ELT broadcasts on 121.5 MHz, 243.0
MHz, and 406.028 MHz.
The SRB-406 is designed for semi-permanent installation in survival raft or raft devices.
It features automatic activation when it comes in contact with water and also
incorporates a manual activation means for operation on land. There are two models,
the -001 and the -002. The -001 single antenna SRB-406 is configured for use on
non-reversible, self-righting rafts and the -002 dual antenna SRB-406 is for rafts that are
reversible.
2.0 COMPONENT DESCRIPTION AND OPERATION
2.1 Transmitter
The transmitter produces a signal for search and rescue when locating survivors of an
aircraft accident. The transmitter is automatically activated when the raft is deployed in
water. The transmitter may also be manually activated. In the event that the raft is
deployed on land, the ELT may be activated manually by touching both of the contacts
on the antenna base with moistened fingers. ELT activation is indicated by the flashing
light emitting diode (LED) located on the top of the transmitter case.
The SRB transmitter is protected inside a tough sealed plastic case. The case is
designed to protect the transmitter electronics and battery from external loads
encountered in packing the inflatable device.
To prevent inadvertent activation in the packed raft, the transmitter features an arming
pin and lanyard. The transmitter does not receive battery power until the arming pin is
pulled from the transmitter case. The arming pin lanyard is attached on the raft so that
the arming pin is pulled automatically upon inflation of the raft system. Once the arming
pin is pulled, the unit will begin to transmit as soon as the water activation
sensor/antenna(s) is submerged (or the sensors are shorted by means of moistened
fingers). Reinstalling the arming pin into the mating clip will cause the unit to cease
transmitting.
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