AVIATION HEADSET Owner’s Guide ©2006 Bose Corporation, The Mountain, Framingham, MA 01701-9168 USA AM270261 Rev.
DECLARATION OF CONFORMITY We, the offerer: Bose Corporation, The Mountain, Framingham, MA 01701-9168 USA Acknowledge our sole responsibility, that the product: Kind of equipment: Bose® Aviation Headset Type Designation: AHX-32-0# and AHX-34-0# In accordance with EMC Directive 89/336/EEC and Article 10(1) of the Directive, is in compliance with the following norm(s) or documents(s) Technical regulations:EN55013, EN55020 Accredited by: Bose Corporation, The Mountain, Framingham, MA 01701-9168 USA 15 June 20
CAUTIONS AND ADVISORIES Operational advisory The Bose® Aviation Headset is an active noise reducing (ANR) headset. As with any complex electronic device, it is possible for this headset to fail during operation. Symptoms of failure may include loud tones, distortion, and loss of communications signal in the headset when used in the ANR mode. Note: The headset includes redundant circuitry to reduce the effects of such failures and allow for continued use of the headset in the ANR mode.
CAUTIONS AND ADVISORIES How use of the headset affects hearing safety The headset is intended for use with ANR turned on. Noise reduction and communications performance are reduced with ANR turned off. Volume control Make sure your aircraft communications system volume control is easily accessible. This control affects the strength of the communications signal coming into the headset, whether ANR is on or off.
CAUTIONS AND ADVISORIES Figure 2 TriPort® headset openings TriPort headset openings Earcup inner screen The protective inner screen is critical to the headset’s ability to reduce noise (Figure 3). Figure 3 Protective inner screen inside the earcup Earcup inner screen Do not attempt to remove, replace, or repair this screen. If operating problems indicate the need for screen replacement, contact the Bose® Aviation Headset Department. Refer to “Contact information” on page 34.
CONTENTS Cautions and Advisories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Operational advisory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Power source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 How use of the headset affects hearing safety . . . . . . . . . . . . . . . . . . 4 Volume control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CONTENTS Operating the aircraft powered headset . . . . . . . . . . . . . . . . . . . . . . . 23 Power switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Volume control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Notice the individual earcup controls . . . . . . . . . . . . . . . . . . 24 Controlling the volume of a single aircraft powered headset 24 Volume control using multiple headsets . . . . . . . . . . . . . . . .
INTRODUCTION We appreciate your choice Congratulations on your purchase of a Bose® Aviation Headset . ® This headset combines Bose Acoustic Noise Cancelling headset technology to electronically reduce unwanted aircraft noise, and Bose TriPort® headset technology for a smaller, lighter, more comfortable headset that delivers full-spectrum noise reduction. We believe it is the finest aviation headset you can own.
INTRODUCTION Figure 4 The (a) battery powered and (b) aircraft powered versions of the headset (a) (b) 9
GETTING YOUR HEADSET READY FOR USE Locate the serial number for your product registration card The Bose® Aviation Headset the carton. includes a product registration card in Please fill in the requested information and mail it to Bose. We will use this information to provide you with appropriate advisories and updates. Be sure to include your headset serial number, which is located on the underside of the magnesium headband, underneath the headband cushion.
GETTING YOUR HEADSET READY FOR USE note the important markings for left (L) and right (R) above each earcup. These markings indicate which ear each earcup is intended to fit over. Removing an attached boom microphone cable 1. Use a flat-tipped screwdriver to loosen the two screws at the base of the boom microphone cable assembly. 2. Pull the cable assembly straight out from the earcup to which it is attached (Figure 6). CAUTION: Do not twist the boom microphone cable while disconnecting it.
GETTING YOUR HEADSET READY FOR USE Figure 7 Positioning the mic cable assembly on the preferred earcup L for left Access cover Connector pins 4. Cable assembly Connector pins Press the assembly onto the connector pins until it is fully engaged and the cable assembly is flush with the earcup. CAUTION: Do not apply excessive force, which may result in earcup damage. 5. With the screw threads properly aligned, tighten the screws. 6.
GETTING YOUR HEADSET READY FOR USE Preparing to use battery power The battery compartment on your headset control model serves two purposes. In addition to holding the batteries, it contains small switches (Figure 9) that give you the option to change some of the factory-set operation defaults for your headset.
GETTING YOUR HEADSET READY FOR USE Inserting batteries Insert the two supplied alkaline AA batteries (IEC LR6) into the control module (Figure 10). Figure 10 Installing the two batteries + CAUTION: The battery compartment is designed to prevent inadvertent reverse polarity from installing the batteries incorrectly. If the batteries do not seem to fit correctly, do not force them in. Forcing an improper connection will cause permanent damage to the control module.
GETTING YOUR HEADSET READY FOR USE CAUTION: Do not attempt to pull the connector out without first pulling back on the sleeve. Forcing the connector out will cause damage to the cable and/or your aircraft instrument panel. Figure 11 Slide sleeve to release Align keyway Attaching and removing the cable Mounting the connector Mount the connector into a cutout, as shown in Figure 12 below.
GETTING YOUR HEADSET READY FOR USE Details on making the connections The pinout for the optional installed connector is: Red 2 Black System ground. Connect to the existing audio ground. 3 White Phone communication–Left. 4 Black Phone communication–Right. 5 White Microphone/Hi-audio. Connect to the portion of the existing microphone jack that corresponds to the ring position of a headset microphone plug. Do not connect to the tip (PTT) segment. 6 White/ Blue Microphone/Lo-ground.
GETTING YOUR HEADSET READY FOR USE Notes For use with a stereo intercom, connect the left and right channels to their respective positions. For monaural operation, connect pins 3 & 4 together to the tip of the existing phone jack. Do not use excessive force or bend the installed connector. This may damage or break internal solder joints. If the boom microphone works on radio transmit but not through the intercom, check pin 6. It may be incorrectly wired to the PTT segment of the microphone jack.
GETTING YOUR HEADSET READY FOR USE Mono, stereo, and helicopter connection diagrams Figure 13 Diagram of connections for a mono signal Ring and wiring Ti pp (phone audio) Figure 14 Diagram of connections to aircraft stereo jacks n Figure 15 Diagram of connections to a helicopter single jack 18
USING YOUR HEADSET Wearing it properly Proper fit on your head is important both for comfort and good noise reduction performance. Here are a few guidelines: • Use the left (L) and right (R) markings above the earcups to orient the headset properly (Figure 16). Figure 16 R L Matching the R and L markings to your right and left ears • Use a light grasp to adjust each earcup so its cushion is completely over your ear and you feel an even, gentle pressure all around it.
USING YOUR HEADSET Microphone placement Proper microphone placement is important for clear communications. With the headset on your head, make these adjustments: 1. Figure 17 Grasp the boom with your fingers and move the microphone up or down so it is level with your mouth (Figure 17). (a) Properly placing the microphone, (a) wide side nearly touching your mouth, not (b) farther away or (c) tilted (b) Mic is too far away Mic label (c) Mic label is not facing mouth Mic is 1/2 inch from mouth 2.
USING YOUR HEADSET Power button Use the power button to turn the headset on or off, or to change the LED brightness (Figure 18). • Press the power button once to turn on ANR. • Press and hold the power button to turn off ANR. Or rely on the smart shutoff feature (descibed on page page 13). Note: For details on how to disable smart shutoff, see “Changing the optional operation switches” on page 13. • Press twice rapidly to toggle between the daytime (brighter) and nighttime (dimmer) LED settings.
USING YOUR HEADSET Holding the control module upright and facing you: • Use the left knob to adjust volume in the left earcup. • Use the right knob to adjust volume in the right earcup. Controlling the volume of a single battery powered headset With ANR on: 1. Set the aircraft communication system to a safe operating level. 2. Turn each volume knob on the headset control module down to decrease, or up to increase the volume of the earcup it controls.
USING YOUR HEADSET An LED, located on the control module, changes color to indicate the power status, as follows: LED Color Type of light Indicates Green Blinking Power ON and batteries good Amber Fast blinking Power ON, but batteries low (8 hours or less remaining) Red Faster blinking Power ON, but batteries very low (2 hours or less remaining) Off None Power OFF or batteries dis charged Operating the aircraft powered headset Power switch Turn on ANR by setting the power switch to ON (Figure
USING YOUR HEADSET CAUTION: Avoid setting the volume levels too high. Exposure to loud sounds may cause hearing damage. Notice the individual earcup controls Separate knobs on the control module control the volume for each separate earcup (Figure 19 on page 23). Holding the control module upright and facing you: • Use the left knob to adjust volume in the left earcup. • Use the right knob to adjust the volume in the right earcup.
HEADSET CARE AND MAINTENANCE Instructions for continued airworthiness Bose recommends following the general care and maintenance instructions in this guide. With normal use, items such as windscreens and ear cushions may require periodic replacement. If cleaning or replacement of these items is needed, follow the recommendations on the following pages. All other care and maintenance, in and out of the warranty period, must be performed by Bose or an authorized dealer.
HEADSET CARE AND MAINTENANCE Ear cushions As a general rule, ear cushions should be replaced after 500 hours of use, depending on how often you fly.
HEADSET CARE AND MAINTENANCE Headband cushion 1. Remove the cushion as described in “Headband cushion replacement” on page 29. 2. Place the cushion in a solution of water and a mild detergent. 3. Allow the cushion to air dry, then, reattach. Removing environmental moisture If the protective inner screen becomes damp, due to environmental moisture such as light rain, dew, perspiration, or condensation, allow it to air dry only.
HEADSET CARE AND MAINTENANCE 3. Properly position the replacement ear cushion against the earcup. 4. Tuck an edge of the ear cushion skirt into the slot behind the ear cushion flange. Be careful not to fold the skirt over. 5. Work the remainder of the skirt into the slot completely around the earcup. 6. Grasp the ear cushion and adjust its position to remove any folds in the skirt and wrinkles in the cushion. Battery replacement Figure 22 a) Sliding open the battery compartment door 1.
HEADSET CARE AND MAINTENANCE Battery door replacement 1. Slide the battery door down using the finger indent and lift open. 2. Gently rotate the cover sideways to remove from the control module. 3. Insert new door tab, being careful to insert between the metal spring and plastic housing. Headband cushion replacement The headband cushion is designed to give the maximum level of comfort to your headset. Please follow the maintenance instructions below for regular care.
TROUBLESHOOTING In case of difficulty Look for the problem in the left column of the table, then follow the instructions on “What to do” in the right column. If the problem persists, contact the Bose® Aviation Headset Department, using the contact information on page 34 of this guide, for assistance. Problem Communication, but no active noise reduction in either ear What to do • Make sure the headset ANR is set to ON. • If using aircraft power, check the aircraft fuse or circuit breaker.
TROUBLESHOOTING Stereo missing or communications in one ear only • If your aircraft has a mono audio system, verify that the stereo/ mono configuration switch is set to mono. See “Changing the optional operation switches” on page 13. If the switch is set to stereo, and the headset is plugged into a mono audio system, you will hear only through the left earcup. Squealing, whistling, or chirping sound when the system is turned on • Check to see if the protective inner screen is damaged.
TECHNICAL INFORMATION Sound pressure levels (SPL) are relative to 20 micropascals. Headphone Damage could occur to avionics equipment that is intended for use only with 600-ohm headsets. If in doubt, consult the avionics equipment manufacturer.
TECHNICAL INFORMATION Headset weight 12 ounces (340 grams) on the head when cable is supported by the mounting clip Headset size range Breadth: 4.8 to 6.3 inches Temperature and Altitude (Category A) Operating: 5 to 131°F (-15 to 55°C) Height: 4.5 to 5.
SERVICE & WARRANTY INFORMATION Warranty period Limited 5-year warranty: Bose Corporation warrants this headset to be free from defects in materials and workmanship for a period of five years from the date of purchase. Ear cushion life will vary with use. Ear cushions carry a six-month limited warranty against manufacturer’s defects.
SERVICE & WARRANTY INFORMATION European Headquarters: Noise Reduction Technology Group Nijverheidstraat 8 NL-1135 GE Edam TEL:+31(0)299-390150 FAX:+31(0)299-390109 E-MAIL: aviation_europe@bose.com World Wide Web: www.bose.com Ordering parts and accessories The following accessories and customer-replaceable components may be purchased directly from Bose. Refer to contact information on page 34.
AVIATION HEADSET Owner’s Guide ©2006 Bose Corporation, The Mountain, Framingham, MA 01701-9168 USA AM270261 Rev.
