EQUIPMENT MANUAL 251-16-1 REV -
251/251-16-1 Amendment #2 Aug 9, 2011 Page c
PROPRIETARY AND CONFIDENTIAL TO COBHAM
MODEL 251 DETAIL PART NUMBER PROCEDURES AND LEVELS
The following is a tabulation of all detail part numbers available for the
Model 251 Passenger Speaker Amplifier. A Model 251 with an
associated detail part number is designated as a Model 251-XXX,
where XXX is the applicable three digit detail part number.
Table A. Detail Part Numbers
Detail Part No. Description of Detail
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.
-001 calibration is designed for use with 4-inch speakers.
002 Identical to 251 Base Model. Part number 251-002 was created to
prevent a conflict with an existing part number 251 in customer part
system.
003 Identical to 251 Base Model with the following exceptions:
a) Briefing audio is to output through the right speaker only.
b) The receiver inputs and switches are not available.
c) The briefer switch input is externally grounded, disabling the
Stereo Left input and the Stereo Right input.
Installation information can be found in the 251-003 Installation and
Operation Manual Supplement.
006 Identical to 251 Base Model with the following exceptions:
a) The chime tones are routed to the PA sidetone audio output.
b) The chime tones are activated upon the activation of the PA
key.
Installation information can be found in the 251-006 Installation and
Operation Manual Supplement.
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