Bose Aviation Headset Series II Owner's guide - Page 3

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 substances. 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 punctures, for example. EN352-4 also calls for HML Criterion Levels and other data to be provided to describe the hearing protection performance of leveldependent 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 measured 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 Characteristics 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. 3