Owner manual

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.

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.

(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.