Honeywell 1152682-2 - RESCU 406 AFN Functional Description and Features; Transmitter Unit;AIM and NAIM Functional Description

COMPONENT MAINTENANCE MANUAL
1152682
Page 12
Oct 27/06
© Honeywell International Inc. Do not copy without express permission of Honeywell.
23-24-02
7. RESCU 406AFN Functional Description and Features
The RESCU 406AFN system consists of the following components:
• Transmitter Unit
• Antenna
• Remote Panel
• Remote Audible Alarm Panel
• AIM or NAIM.
A. Transmitter Unit/AIM and NAIM Functional Description
(1) The transmitter unit detects the occurrence of a crash using an internal G-switch and
automatically transmits three separate output signals at 121.5 MHz, 243 MHz and 406
MHz frequencies. The 121.5 MHz and 243 MHz signals are both amplitude modulated
signals whereas the 406 MHz signal is a 440 ms short/520 ms long pulse (occurring once
every 50 seconds) on which a coded message is superimposed by phase modulation.
(2) The AIM is an optional module which, when installed and programmed, provides
automated reprogramming of the 406 MHz message in the transmitter unit with one of the
selected short (112 bits) message protocols. The purpose of the AIM is to allow the
replacement of the transmitter unit without the need to reprogram with aircraft specific
data, including aircraft tail number. The AIM includes a storage device which is used to
automatically program the transmitter unit.
(3) The NAIM is an optional module which, when installed and programmed, provides
automated reprogramming of the 406 MHz message in the transmitter unit with any of the
various long (144 bits) message protocols. The NAIM also provides an interface to the
aircraft navigation system (NAV), to automatically download into the transmitter unit the
last aircraft position (longitude/latitude), and transmit this position in the 406 MHz signal.
The NAV feature is provided by an ARINC data interface on the NAIM, which is powered
by the aircraft 28 V dc supply. The NAIM includes a storage device which is used to
automatically program the transmitter unit.
(4) The transmitter unit requires removal and regular maintenance. The AIM or the NAIM, due
to its simple circuitry and the
RESCU 406AFN self-test, does not need removal or regular
maintenance; aircraft specific programming data therefore remains uniquely with the
designated aircraft.
Activation Alert . . . . . . . . . . . . . . . . . . . . . . . . . . Visual (LED) and Optional Audio (buzzer) output
Remote Audible Alarm Panel
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 g (0.12 lb)
Height . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 mm (2.0 in.)
Depth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 mm (2.0 in.)
Current Consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 mA
Audio Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . > 75 dBa
TABLE 1. LEADING PARTICULARS (Cont’d)