Headphones User Manual
35
Tab 6, 14
English Tab 2, 10 Tab 3, 11 Tab 4, 12 Tab 5, 13
Tab 8, 16Tab 7, 15
TECHNICAL INFORMATION
FAA Technical Standards Order
The Bose
®
 A20
®
 Aviation Headset, its interface, cables, and microphones are 
FAA approved to TSO C139. It has been designed to function in or withstand 
exposure to the following environmental conditions:
Environmental categories cited refer to RTCA/DO-160F and RTCA/DO-214 (March 2, 
1993).
The conditions and tests required for TSO approval of this are minimum performance 
standards. It is the responsibility of those installing this article either on or within a 
specific type or class of aircraft to determine that the aircraft installation conditions are 
within the TSO standards. TSO articles must have separate approval for installation in 
aircraft. The article may be installed only if performed under 14 CFR part 43 or the 
applicable airworthiness requirements.
This device complies with FCC and Industry Canada RF radiation exposure limits for 
general population. It must not be collocated or operating in conjunction with any other 
antenna or transmitter.
Este equipamento opera em caráter secundário, isto é, não 
tem direito a proteção contra interferência prejudicial, 
mesmo de estações do mesmo tipo, e não pode causar 
interferência a sistemas operando em caráter primário.
Condition Category
Altitude and temperature A1
Salt fog S
AF conducted susceptibility B
Humidity B
Magnetic effect Z
Power input B
RF susceptibility T
Temperature and altitude A1
Vibration S, R, and U
Voltage spike A
Shock drop 12 times, 1 m onto concrete
Names and Contents of Toxic or Hazardous Substances or Elements 
Toxic or Hazardous Substances and Elements
Part Name Lead (Pb) Mercury (Hg) Cadmium (Cd) Hexavalent (CR(VI)) Polybrominated Biphenyl (PBB)
Polybrominated 
diphenylether (PBDE)
Metal parts X 0 0 0 0 0
Plastic parts 0 0 0 0 0 0
Speakers X 0 0 0 0 0
Cables X 0 0 0 0 0
O: Indicates that this toxic or hazardous substance contained in all of the homogeneous materials for this part is below the limit requirement in SJ/T 
11363-2006. 
X: Indicates that this toxic or hazardous substance contained in at least one of the homogeneous materials used for this part is above the limit require-
ment in SJ/T 11363-2006. 
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