SM34 AA21-400 Cabin PA System INSTALLATION AND OPERATION MANUAL REV. 4.00 November 10, 2003 Northern Airborne Technology Ltd. 1925 Kirschner Road Kelowna BC, Canada V1Y 4N7 Telephone (250) 763-2232 Facsimile (250) 762-3374 Copyright 2003 by Northern Airborne Technology CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
SM34 Rev. 4.00 AA21-400 Cabin PA System Manual Periodically NAT will release manual amendments. In order to maintain the most accurate and up to date manual these amendments should be carried out immediately upon receipt and recorded on the following amendment record.
INSTALL_OPS MANUAL AMENDMENT Manual: SM34 (AA21-400) Document # SM34\Install_Ops\809-0003 Amendment #: 3 Amendment Date: Apr 21, 2009 The purpose of this amendment is to add the latest drawings to the manual. Amendment Instructions: Remove Pages Replace With Pages 2-5 Rev 4.00 Amendment 1 2-5 Rev 4.00 Amendment #3 1 2 Remove Drawings (Section 2) Replace or add Drawings (Section 2) AA21\400\403-0 Rev 1.00 AA21\400\905-0 Rev 1.00 AA21\400\403-0 Rev 1.01 AA21\400\905-0 Rev 1.
INSTALL_OPS MANUAL AMENDMENT Manual: SM34 (AA21-400) Document # SM34\Install_Ops\809-0002 Amendment #: 2 Amendment Date: May 24, 2006 The purpose of this amendment is to correct the numbering sequence and add section 1.5 Accessories Required But Not Supplied to the table of contents. Amendment Instructions: Remove Pages Replace With Pages Title Section Page iii Rev 4.00 1-3 and 1-4 Rev 4.00 Title Section Page iii Rev 4.00 Amendment #2 1-3 and 1-4 Rev 4.
INSTALL_OPS MANUAL AMENDMENT Manual: SM34 (AA21-400) Document # SM34\Install_Ops\809-0001 Amendment #: 1 Amendment Date: Jan 18, 2005 The purpose of this amendment is to add the Environmental Qualification Form (521-0) to section 2.5 and to update the section 2.3.4 Cable Wiring statement paragraph 1. Amendment Instructions: Remove Pages Replace With Pages 2-1, 2-2 and 2-5 Rev 4.00 2-1, 2-2 and 2-5 Rev 4.
SM34 Rev. 4.00 AA21-400 Cabin PA System Manual Table of Contents Section Title Page 1.0 Description 1.1 1.2 1.3 1.4 1.4.1 1.4.2 1.4.3 1.5 Introduction Purpose of Equipment Features Specifications Electrical Specifications Physical Specifications Environmental Specifications Accessories Required But Not Supplied 2.0 Installation 2.1 2.2 2.3 2.3.1 2.3.2 2.3.3 2.3.4 2.3.5 2.3.6 2.4 2.
SM34 Rev. 4.00 AA21-400 Cabin PA System Manual Section 1.0 Description 1.1 Introduction This manual contains information on the AA21-400 Cabin PA System. Information in this section consists of purpose of equipment, features and specifications. 1.2 Purpose of Equipment The AA21-400 Cabin PA control unit is designed to provide centralized control for an aircraft’s internal and external PA systems. The design is contained in one panelmounted unit, with an illuminated faceplate.
AA21-400 Cabin PA System Manual SM34 Rev. 4.00 1.4 Specifications 1.4.1 Electrical Specifications Power Supply Linear DC (with reverse & over voltage protection): Normal: +27.5 Vdc nominal. +22.0 Vdc minimum. +30.3 Vdc maximum. +18.0 Vdc emergency. Input Current: 2.3 A max. full speaker power (35 W) @ +27.5 Vdc. 2.9 A max (35 W) with 0.40 A load on Switched Power Output. 0.40 A idle @ +27.5 Vdc. Backlighting: 150 mA max @ +27.5 Vdc. Microphone: 150 Ohm amplified dynamic.
SM34 Rev. 4.00 AA21-400 Cabin PA System Manual Output Signals Speaker: Impedance and short circuit protected. ≤ 10% THD 20 W single tone into 8 Ω @ 50% duty cycle. Continuous. 20 W voice/music into 8 Ω @ 100% duty cycle. Continuous. Note: Distortion is ≤ 3% THD at 10% of continuous output power rating. > 10% THD 35 W max. into 8 Ω with 2.5 Vrms into Radio (Receive) input. Non-continuous (short term).
AA21-400 Cabin PA System Manual 1.4.2 SM34 Rev. 4.00 Physical Specifications 1.4.3 Height 1.11 ± 0.03” (28.1 ± 0.8 mm) Depth 6.53 ± 0.03” (165.9 ± 0.8 mm) behind panel (including connector). Width 4.96 ± 0.03” (126.0 ± 0.8 mm) behind panel. 5.75 ± 0.03” (146.1 ± 0.8 mm) in front of panel. Weight 1.40 ± 0.07 lbs. (0.64 ± 0.03 kg) Mounting Std. Dzus Mounting (4 fasteners) Faceplate Engraved acrylic edge lit panel, with 28 Vdc backlighting.
SM34 Rev. 4.00 1.5 AA21-400 Cabin PA System Manual Accessories Required But Not Supplied Installation kit p/n AA21-400-IKC (crimp) or AA21-400-IKS (solder) is required to complete the installation.
SM34 Rev. 4.00 AA21-400 Cabin PA System Manual Section 2.0 Installation 2.1 Introduction Information in this section consists of: unpacking and inspection procedures, installation procedures, post-installation checks, and installation drawings. 2.2 Unpacking and Inspection Unpack the equipment carefully and locate the warranty card. Inspect the unit visually for damage due to shipping and report all such claims immediately to the carrier involved.
AA21-400 Cabin PA System Manual 2.3.3 SM34 Rev. 4.00 Cautions Use shielded cable exactly as shown and ground as indicated. All audio installations can be severely degraded by incorrect wiring and shielding. Unusual buzzes, hums or other background audio are symptomatic of multiple grounds, or noisy external systems such as blowers or pumps sharing wiring with the audio system. Never operate any of these units below their 8 Ω rated impedance. 2.3.
SM34 Rev. 4.00 2.3.5.2 AA21-400 Cabin PA System Manual Power On checks WARNING The AA21-400 is a high power device, capable of producing tones at very high volume levels. Ensure that all personnel are well clear of the aircraft prior to keying the siren or PA. Failure to adhere to this warning could cause injury to personnel and/or damage to equipment. DO NOT conduct the following tests inside an enclosed area (i.e. a hangar.
AA21-400 Cabin PA System Manual 2.3.6 SM34 Rev. 4.00 Adjustments The unit ships from the factory with all internal adjustments set to the normal test levels. Once installed in the aircraft, it may be desirable to change some of these settings to best suit the local operating environment. The internal adjustments are accessible through holes located on the top of the unit. Level Adjustments Sweep Rate Adjustments Configuration Jumpers 2.3.6.
SM34 Rev. 4.00 2.3.6.3 AA21-400 Cabin PA System Manual Mic level: (60dB dynamic range) Receive level: (70dB dynamic range) Siren level: (70dB dynamic range) Configuration Jumpers The configuration options for the AA21-400 can be selected by installing jumpers as shown below: RX/CD: Pins 1-2 : Radio (Receive) input enabled, CD input disabled Pins 2-3 : CD input enabled, Radio (Receive) input disabled EXT SPKR LEVEL : 2.4 Installed : 500 mVrms output level Not installed : 6.
SM34 Rev. 4.00 AA21-400 Cabin PA System Manual Section 3.0 Operation 3.1 Introduction Information in this section consists of the functional and operational procedures for the AA21-400 Cabin PA system. 3.2 Operation Specifics The AA21-400 Cabin PA system provides a central adjustment for internal and/or external aircraft paging functions. The AA21-400 is a self-contained amplifier that directly drives the cabin speaker(s) and/or the external PA system amplifier.
SM34 Rev. 4.00 3.4.2 AA21-400 Cabin PA System Manual Input Function Selection The Input Function switch is a two-position, locking switch on the front of the AA21-400 that is used to select between PA and Radio operation. When PA is selected, RADIO is disabled, and vice versa. It is good practice to set this switch to PA when operating the siren to avoid mixing incoming radio/CD audio with the siren audio output. Input Function Switch 3.4.2.
SM34 Rev. 4.00 3.4.4 AA21-400 Cabin PA System Manual Mode Switches Siren Mode Switch Internal/External Mode Switch 3.4.4.1 Siren Mode The siren mode switch is a three position, centre-off locking switch on the front of the AA21-400. The siren is operated by selecting the mode (YELP or WAIL) and then activating a remote Siren key. The siren will sound only as long as the mode is selected to WAIL or YELP and the Siren key is activated.
