Northern Airborne Technology RS12 - Manual (Page 16)

RS12/RS24 Remote Switch Manual SM15 Rev. 4.00
Page 2-2 Nov 24, 2003
ENG-FORM: 805-0104.DOT
Amendment #1 May 12, 2005
PROPRIETARY AND CONFIDENTIAL TO NORTHERN AIRBORNE TECHNOLOGY LTD.
2.3.3 Cabling and Wiring
All unshielded wire shall be selected in accordance with AC43.13-1B Change 1,
Paragraphs 11-76 through 11-78. Wire types should be to MIL-W-22759 as specified in
AC43.13-1B Change 1, Paragraphs 11-85, 11-86, and listed in Table 11-11. For
shielded wire applications, use Tefzel MIL-C-27500 or equivalent shielded wire with
solder sleeves (for shield terminations) to make the most compact and easily terminated
interconnect. Follow the wiring diagrams in Section 2.4 as required.
Allow 3 inches from the end of the wire to the shield termination to allow the hood to be
easily installed. Note that the hood is a ‘clamshell’ hood and is installed after the wiring
is complete.
All wiring should be at least 22 AWG, except power and ground connections which
should be 20 AWG. Ensure that the ground connection is clean and well secured. To
prevent system failure or inadequate equipment protection, power to each component of
this system should be supplied from a separate breaker or fuse and not bundled to any
other source.
2.3.4
External Switches and Lamps
Switches and or annunciators must be selected to suit the application. If all lines are
picked at once, a single pushbutton (alternate action) or toggle switch may be used to
supply the ALL KEY line. Note that a single switch/lamp assembly can replace the
transfer switch and annunciators. This should be a lighted pushbutton switch
(SPST/SPDT), with positive action (i.e., push on, push off), and two legends to match
the desired NAV functions.
If serving as audio key relays (for boom microphones, etc.), the unit can be triggered by
in-line drop cords or other methods that supply an input to the appropriate key line.
If serving as NAV selector, annunciator lights should be connected through one or
more relay contacts to ensure indication of actual relay positions.
2.3.5 Post-Installation
Checks
2.3.5.1 Voltage/resistance checks
Do not attach the RS12/RS24 until these conditions are met.
With the RS12/RS24 disconnected from its mating connector, check P101 (top
connector) pin 17 for +14/28 Vdc relative to ground and pin 34 for continuity to ground
(below 0.5 ohms).
If testing an RS24, also check P102 (bottom connector) pin 17 for +14/28 Vdc relative to
ground and pin 34 for continuity to ground (below 0.5 ohms).