ACR&Artex ELT to Nav Interface - Manual (Page 45)

25-69-10
Page 45 of 58
APR 30/12
ARTEX PRODUCTS / ACR ELECTRONICS, INC.
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
453-6500
TASK 25-69-10-450-803
3. Wiring
SUBTASK 25-69-10-990-001
A. General Considerations and Recommendations
CAUTION: IF GROUND OR OTHER CONNECTIONS ARE BROKEN OR OTHERWISE DAMAGED, THE
ELT IS STILL CAPABLE OF AUTOMATIC ACTIVATION; HOWEVER, ELT/NAV INTERFACE
OPERATION MAY BE AFFECTED AND POSITION DATA MAY NOT BE TRANSMITTED TO
THE ELT.
CAUTION: INCORRECT TERMINATION OF THE WIRING IN THE CONNECTORS MAY DAMAGE THE
ELT/NAV INTERFACE. VERIFY THE WIRING AGAINST THE WIRING DIAGRAM AND
PERFORM A CONTINUITY CHECK TO CONFIRM GOOD CONNECTIONS AND PROPER
PIN LOCATIONS.
(1) The following wiring and grounding considerations and recommendations are applicable:
(a) Minimum 22 AWG wire size for interface wiring.
(b) Shielding is recommended to help prevent EMI and RF interference.
(c) Use high quality conductor meeting MIL-W-16878, M22759, M27500, or a commercial
equivalent acceptable for use in aircraft applications.
(d) Provide a “Drip Loop” at the ELT/NAV Interface plug and ELT receptacle to divert
moisture from the connections. See SUBTASK 25-69-10-990-001, on page 19, for a
definition.
(e) All grounds must be common to aircraft ground.
(2) Maximum interface and data line wire lengths are:
(a) Interface Harness - 3 feet (0.9 m)
(b) ARINC 429 - 360 feet (110 m)
NOTE: Ground shield at every break. ELT/NAV Interface plug strain relief is not an
acceptable ground.
(c) RS-232 - 50 feet (15 m)
(3) Minimum 24 AWG wire size for 24-bit address reprogramming ground wires.
(4) Switch block, if used, must be located less than 3 feet (0.9 m) from the ELT/NAV Interface
and wiring must not exceed 3 feet (0.9 m) including strain relief.