Bose Aviation Headset X E User Manual

							31
Troubleshooting
Stereo missing or communi-
cations 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.
Low rumbling sound with 
headset turned on in a quiet 
environment•Adjust the earcup fit to create a better seal on your head. The 
headset’s low-force design makes it sensitive to items that 
interfere with the seal around your ear. Make sure that your 
ears are completely inside the ear cushions, and that a hat or 
eyeglasses with thick temples do not interfere with the seal.
•Check ports at the outside surface of each earcup to ensure 
they are not blocked. If dust or dirt is present, carefully remove 
the debris using tweezers. Do not blow out or vacuum debris. 
•Inspect the seal between the ear cushion skirt and the earcup. 
The skirt should enclose the earcup evenly, without gaps. 
Replace any cushions that have surface tears, torn stitching 
joints, large wrinkles, or have become dried and stiff.
Crackling sound audible with 
headset turned on in a loud 
environment, or ANR is inter-
mittent•Adjust the earcup fit to eliminate the crackling sound. Refer to 
“Wearing it properly” on page 19.
•If your headset is battery powered, check to see if the battery is 
low (indicated by fast blinking red LED).
•If your headset is aircraft powered, make sure that the voltage 
powering the headset is greater than 10 VDC. 
•Inspect the seal between the ear cushion skirt and the earcup. 
The skirt should fit into the slot on the earcup with no gaps. 
Replace any cushions that have surface tears, torn stitching 
joints, large wrinkles, or have become dried and stiff.
No active noise reduction 
and no communication•Check boom microphone cable connection on the bottom of 
the earcup.
CAUTION: Do not attempt to disassemble or service the inside of the earcups or other parts of 
the headset. Only the boom microphone cable, connector access cover, batteries, battery 
cover, windscreen, and ear cushions are replaceable by the user. For instructions on how to 
care for the headset and how to replace the ear cushions, refer to “Headset Care and Mainte-
nance” on page 25. 
						

							32
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.
ImpedanceMonaural mode: 160 ohms (ON) and 230 
ohms (OFF) at 1 kHz
Stereo mode: 320 ohms (ON), 460 ohms (OFF)
Frequency 
response15 Hz to 15 kHz
Sensitivity: 90 dB SPL typical, measured at 
1 mw, 1 kHz, full volume on KEMAR ear 
simulator
Microphone 
(Electret)Bias required: 8 to 16 VDC through 220 to 
2200 ohms
Sensitivity: Varies depending upon bias and 
radio AC input impedance. Typical output is 
300 mV at 114 dB SPL. To assure proper mod-
ulation of the radio, it is recommended that an 
avionics technician adjust its input to match 
the output of the microphone. 
Microphone 
(Dynamic)Impedance: 5 ohms
Sensitivity: Equivalent to M-87/M-101
Maximum ambi-
ent noise level115 dBC and 105 dBA SPL
Power sourceBattery powered: 2 AA alkaline, IEC LR6
Aircraft powered: 10 to 32 VDC
Battery lifeAlkaline: Up to 40 hours in typical general 
aviation aircraft noise. Battery life varies with 
ambient noise level, temperature, ear cushion 
condition and age of batteries.
CurrentOperating: 25 ma in typical aircraft noise
Fuse/breaker 
recommended
1/4-amp, fast-blow fuse (AGC 1/4-amp fuse) or 1/2-amp circuit breaker 
						

							33
Technical Information
FAA Technical Standards Order
The Bose® Aviation Headset  , including its interface, cables, and 
electret boom microphone, is FAA approved to TSO C-57a and 
C-58a. It has been designed to function in or withstand exposure to 
the following environmental conditions:
Environmental categories cited refer to RTCA/DO-160D, 
July 29, 1997 and DO-214, March 4, 1993.Headset weight12 ounces (340 grams) on the head when 
cable is supported by the mounting clip
Headset size 
rangeBreadth: 4.8 to 6.3 inches
Height: 4.5 to 5.7 inches
Temperature and 
Altitude 
(Category A)Operating: 5 to 131˚F (-15 to 55˚C)
Storage: -67 to 158˚F (-55 to 70˚C)
Altitude: 15,000 feet maximum pressure alti-
tude for full cancellation 
Condition
Category
AF Conducted Susceptibility B
Humidity B
Magnetic effect B
Power input B
RF susceptibility T
Temperature & altitude A1
Vibration S & U
Voltage spike A
Shock drop 12 times, 1m, 
onto concrete 
						

							34
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 manu-
facturer’s defects.
Service
Contact Bose for:
•Spare parts and accessories (see page 35)
•Technical advice
•Installation information
•Warranty and repair information
To return your headset to Bose for repair
1. Call to request return authorization instructions from Bose. 
2. Clearly mark the return information given to you on the outside of 
the package.   
3. Enclose your name, address, daytime telephone number and 
e-mail address, along with a description of the problem.
4. Securely pack the headset.
5. We recommend that you insure the headset and use a transport 
service that provides a tracking number.
6. Send your headset to this address:
Contact information
Bose Aviation Headset Department
145 Pennsylvania Avenue
Framingham, MA 01701-9168 USA
TEL: 1-800-233-4416 (US)
508-879-7330, ext. 62006 (outside US)
FAX: 1-508-766-5997 
						

							35
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: [email protected]
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.
•Additional control module cable
Specify: battery powered; or aircraft powered
•Ear cushions
•Carry bag
•Windscreen with attachment band
•Aircraft panel connector installation kit
•Battery door
•Fleece headband cushion 
						

							©2003 Bose Corporation, The Mountain
Framingham, MA 01701-9168 USA
270261 AM Rev.00 JN31066