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Bose Aviation Headset Series II Manual

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Operational Advisories
This headset meets or exceeds all requirements of EN352-4, 1996
(European Standard-Hearing Protectors-Safety Requirements and
Testing-Part 4: Level-Dependent Ear Muffs).
• The wearer should ensure that:
i. The ear muffs are fitted, adjusted, and maintained in
accordance with the manufacturer’s instructions.
ii. The ear muffs are worn at all times in noisy surroundings.
iii. The ear muffs are regularly inspected for serviceability.
WARNING:
If the above recommendations are not adhered to, the
protection afforded by the ear muffs will be severely impaired.
• This product may be adversely affected by certain chemical sub-
stances. Further information can be sought from the manufacturer.
• Ear muffs, and in particular cushions, may deteriorate with use and
should be examined at frequent intervals for cracking and punc-
tures, for example.
EN352-4 also calls for HML Criterion Levels and other data to be
provided to describe the hearing protection performance of level-
dependent devices. At present, no standard has been drafted or
accepted defining how to measure the hearing protection provided by
active noise cancelling headphones. In the absence of an accepted
method, Bose
®
Corporation has had the product’s attenuation mea-
sured by an accredited U.S. testing laboratory using a combination of
real head methods. Based on this information, the Bose Aviation
Headset Series II provides sufficient hearing protection in any noise up
to 108 dB(A) in sound pressure level. For more information on the
methods used and the results obtained, please contact the Bose
Aviation Headset Service Department (page 23).
This headset complies with RTCA/DO-214 Audio Systems Characteris-
tics and Minimum Operational Performance Standards for Aircraft
Audio Systems and Equipment:
• Transient RF Susceptibility per RTCA/DO-214 ¶ 2.5.11.1 and RTCA/
DO-160C ¶ 20.0, Category T.
• Sustained RF Susceptibility per RTCA/DO-214 ¶ 2.5.11.2 and
RTCA/DO-160C ¶ 20.0, Category T.
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