Northern Airborne Technology 251 - Manual (Page 7)

Model 251 Passenger Speaker Amplifier
SM251 Installation and Operation Manual
Section 1 Rev: 1.00 Issue 2 Page 1-4
ENG-FORM: 800-0115.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
1.4.2 Physical Specifications
Height 2.470"
Depth 4.9000"
max
Width
7.800" max. including flanges and excluding mating connectors
Weight
2.6 lbs
Mounting
Bulkhead Mount (four (4) #8 screws)
1.4.3 Environmental Specifications
Temperature: -55 to +70°C (Operating) Thermal fold-back of the speaker
outputs occurs if the heatsink temperature reaches 105°C.
-55 to +85°C (Survival)
Operating Altitude:
70,000 feet max
Humidity 95%
Non-condensing
Shock
15g (any axis)
Vibration
RTCA/ DO-160C category CL
Qualification of the Model 251 Passenger Speaker Amplifier was completed in accordance with
RTCA/DO-160C Environmental Categories [A2F2]-BA(CL)XXXXXXZ(BZ)AAATZ(XXC2)XX
Note: Refer to Environmental Qualification Form located in Section 2 of this Manual for
complete details of the environmental categories.
1.4.4 Product Approval
FAA: TSO-C50c (RTCA/DO-214 Class I b, RTCA/DO-160C)
1.5 Unit Nomenclature
Examples of derivative products are given below. For full information contact Customer Service & Repair.
Model 251-001
Low pass filters adjusted for -3 dB attenuation at 90 Hz on left and right
speaker outputs.
High pass filters adjusted for -3 dB attenuation at 20 Khz on left and right
speaker outputs.
Designed for use with 4-inch speakers.