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manual abstract
1.2 General Information The AA12S is a compact Dzus-mounted audio controller with an integral 4-place stereo voice-activated intercom. It provides intercom capabilities for the pilot, co-pilot and two passengers (PAX). The AA12S accepts stereo music inputs from either portable or fixed entertainment systems to produce high quality stereo headset output. Radio functions include selectable transmit capability for pilot and co-pilot on 3 COM radios and a PA. Receive audio selections include COM1, COM2, COM3, MKR, NAV, ADF, and DME. 1.2.1 Features All four mics have individual VOX gating. Each gate may also be activated with the corresponding ICS keyline. ICS muting is automatic during radio transmission. The unit is supplied to suit a standard NAT bidirectional ICS audio TIE line for multi-unit interface (configuration dependent). The crew and PAX are always connected except in the case of Pilot ISO mode, when the pilot is disconnected from the ICS tie line. If required, one or more receiver audio inputs may be configured at the factory prior to ordering as (an) unswitched Direct Audio input(s). A new part number may be assigned. Contact NAT Product Support for further information. 1.2.2 Installation Adjustments The following audio levels can be adjusted at the time of installation, or during service by an approved dealer, using individual level trimpots. • Music Mute level • Sidetone level • ICS Bass level • ICS Balance • RX volume level • RX Balance • Music Bass level • Music Balance 1.3 Specifications 1.3.1 Electrical Specifications Power Supply Input voltage 11-30 Vdc operating. Linear regulator with reverse and over voltage protection. Internal supply 11 Vdc Nominal Lighting Voltage 27.5 Vdc @ 200 mA max (AA12S-001) 13.5 Vdc @ 400 mA max (AA12S-004) Nom. Operating Voltages 27.5 Vdc @ 600 mA max (one input for both) 13.8 Vdc @ 600 mA max Maximum Operating 30.3 Vdc Minimum Operating 11.0 Vdc Note: The AA12S is not designed to operate under emergency electrical system conditions for 14 Vdc operation. Input Signals Mic: Quantity 4 (Pilot, Copilot, 2 Passengers) Rated level 250 mVrms nominal (125 to 500 mVrms) Impedance 150 Ohm ±10 % Circuitry type unbalanced TX Keyline: Quantity 2 (Pilot, Copilot) Rated level ground activates keyline, <20 mA source current ICS Keyline: Quantity 4 (Pilot, Copilot, 2 Passengers) Rated level ground activates keyline, <1 mA source current Receive Audio: Quantity 7 (3 COM, 4 NAV) Rated level 2.5 Vrms nominal (1.3 to 5.0 Vrms) Impedance 1 kOhm ±10 % (1 to 3 kOhm for sidetone) Circuitry type unbalanced Music Inputs: Quantity 2 (left channel, right channel) Rated level 1.4 Vrms nominal (850 mVrms to 2.4 Vrms) Impedance 11 kOhm ±10 % Circuitry type unbalanced Bidirectional Signals ICS TIE Channel: Quantity 1 Rated level 340 mVrms nominal (170 to 680 mVrms) Impedance 2 kOhm ±10 % Circuitry type unbalanced Output Signals Phones: Quantity 4 (Pilot, Copilot, 2 Passengers) Rated level >5.5 Vrms (>100 mW, RX, ICS and music) >0.7 Vrms (TX sidetone, adjustable) 1.5 Vrms nominal (Pilot ISO mode) >0.2 Vrms (Automatic failsafe mode) Impedance 300 Ohm ±10 % Circuitry type transformer, unbalanced Mics: Quantity 4 (COM1, COM2, COM3 and PA) Rated level 250 mVrms ±10 % Impedance 150 Ohm nominal Circuitry type direct throughline via relay Keylines: Quantity 4 (COM1, COM2, COM3 and PA) Rated level <1 A Circuitry type grounded relay contact Audio Performance As per RTCA DO-170 Product Classification 1a except where noted. * Manufacturers Specification ** Exceeds DO-170 requirement Rated Output Power (each stereo channel) 100 mW min. into 300 . Audio freq. Response: Receive .3dB down from 350 - 6000 Hz Intercom .3dB down from 350 - 3000 Hz ICS Tie .3dB down from 350 - 3000 Hz Music .3dB down from 300 - 15000 Hz (Music Bass control at mid setting) Distortion .10%, .3 % typical (350 to 6000 Hz) Input - Input crosstalk -37 dB max* Input - Output crosstalk -55 dB max Input - Mic crosstalk <200 .Vrms* Audio noise -60 dB max** Output Regulation .3 dB variance (350 to 6000 Hz) Audio Communication Loud & Clear ICS Volume controls <35 dB range*, 40 dB nominal Music Volume controls <35 dB range*, 40 dB nominal Receive Input impedance 1 k. ±10 % Mic Input impedance 150 . ±10 % Music Input impedance 11 k. ±10 % ICS Tie Line 2 k. ±10 % 1.3.2 Physical Specifications Width 4.95" (125.7 mm) max, behind panel Depth 5.80" (147.3 mm) max, behind panel Height 1.15" (29.2 mm) max Weight 1.2 lb (0.50 kg) max Mounting Dzus rail, four fasteners, 5.366" horizontal spacing, and 0.750" vertical spacing Faceplate Lighted panel is laser-engraved acrylic edge lit with blue-white backlighting Material/Finish Brushed aluminum with chromate conversion Connectors One 25-pin female D-min connector with jackposts One 44-pin male high-density D-min connector with jackposts Installation Kit AA12S-IKC 1.3.3 Environmental Specifications Temperature -20 °C to +55 °C Altitude 50,000 ft Shock 6g/11ms, 20g/11ms Safety of Flight requirements per RT...