Honeywell RESCU 406AFN Component Maintenance Manual With Illustrated Parts List page 14

B. Re-registration is required if the unique 406 MHz identification code is changed for a particular
aircraft. This may occur if:
(1) The transmitter unit on an existing/registered RESCU 406AFN system is being replaced
and an AIM or a NAIM is not attached.
(2) The transmitter unit on an existing/registered RESCU 406AFN system is being replaced
and an AIM or a NAIM is attached but un-coded.
NOTE 1: If an AIM or a NAIM is attached and coded (with/without a 24-bit DIP switch
NOTE 2: Appendix D outlines the 406 MHz registration procedure.
3. Description
A. The RESCU 406AFN is an Automatic Fixed type ELT with NAV/GPS capability. The RESCU
406AFN is permanently fixed to the aircraft in a protected location and activates automatically
upon impact. The beacon remains attached to the aircraft after impact. Since the transmitter unit is
usually located in the tail of the aircraft, a remote panel is normally required, located at a position
visible to the crew. The transmitter unit status may be partially monitored and controlled with this
remote panel.
B. Once activated, the beacon transmits emergency location signals: bursts of digitally encoded
406 MHz signals received by the COSPAS-SARSAT satellite network for alerting search and
rescue (SAR) teams, and continuous 121.5/243 MHz signals for closer proximity directional
tracking.
C. In addition to the transmitter unit, an optional Aircraft Identification Module (AIM) or NAV Aircraft
Identification Module (NAIM) is also available. The function of AIM or NAIM is to automatically
download specific aircraft identification information to the transmitter unit. The preprogrammed
AIM or NAIM is co-located with the transmitter unit, but attached separately to the aircraft and,
when connected to the transmitter unit, automatically downloads the programmed 406 MHz
message into the transmitter unit. The NAIM also allows for storage and automatic reprogramming
of aircraft specific information to the transmitter unit, and also provides an interface to the aircraft
navigational system, for downloading the aircraft position into the transmitter unit. Figure 2 shows
a system block diagram of the RESCU 406AFN system.
4. Programming
A. In order to program the transmitter unit with a unique digital message, a programming tool referred
to as the Beacon Message Programmer (BMP) is used. This tool consists of a personal computer
(or laptop) with a CD ROM, a BMP programming box, programming cable(s) that interfaces to the
transmitter unit or the AIM or the NAIM, and a PC interface cable which interfaces the BMP
programming box to the PC. The BMP programming box is powered using an ac adapter which
plugs directly into a 120 V ac outlet.
© Honeywell International Inc. Do not copy without express permission of Honeywell.
COMPONENT MAINTENANCE MANUAL
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module), no re-registration is necessary as the 406 MHz code is not affected by
the transmitter unit.
23-24-02
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Oct 27/06