ACR&Artex ELT to Nav Interface Boeing - Manual (Page 27)

25-69-11
Page 27 of 58
JUL 28/11
ACR ELECTRONICS, INC / ARTEX PRODUCTS
ABBREVIATED COMPONENT MAINTENANCE MANUAL
-B (453-6501)
TASK 25-69-11-870-803
3. Operation
SUBTASK 25-69-11-870-001
A. Position Data Processing
(1) Operation of ELT/NAV Interface -B position data processing (i.e., receive, convert, and
transmit) is automatic and requires no operator interface other than activating the +28 VDC
power source.
(2) The following conditions must be true for ELT/NAV Interface -B position data processing to
function:
(a) +28 VDC aircraft power must be applied to the unit (i.e., the power source must be
switched on).
(b) The aircraft navigation system must be on and transmitting position data to the ELT/
NAV Interface -B.
(3) Once the ELT is activated, it stops receiving position data; however, the ELT/NAV Interface -B
continues to transmit as long as it has power and is receiving position data.
SUBTASK 25-69-11-870-002
B. 24-Bit Address Reprogramming
(1) Operation of the ELT/NAV Interface -B 24-bit address reprogramming function is automatic
and requires no operator interface other than activating the +28 VDC power source.
(2) When +28 VDC power is applied to the ELT/NAV Interface -B, it reads the ELT 24-bit address
data and compares it to the 24-bit address data hard wired to the ELT/NAV Interface -B.
(3) If a difference in 24-bit address programming is found, the ELT/NAV Interface -B reprograms
the ELT to the data read from the hard wired installation.
(4) When the two sets of 24-bit address data are identical, the ELT/NAV Interface -B takes no
action.
(5) If the ELT is programmed with a protocol other than 24-bit address, the ELT/NAV Interface -B
attempts to reprogram the ELT with new aircraft identification data and fails.
(a) If P1 (i.e., 24-bit address) is connected to the ELT/NAV Interface -B and the ELT is
programmed with a protocol other than 24-bit address, an error will be displayed by the
ELT LED.
(b) See SUBTASK 25-69-11-750-002, on page 36, and Table 6, on page 38.