Elt And Navigation System Interfaces; Figure 8. Elt/Nav Interface Wiring Diagram - COBHAM ELT/NAV INTERFACE Abbreviated Component Maintenance Manual

SUBTASK 25-69-10-450-001
B.

ELT and Navigation System Interfaces

CAUTION: DO NOT CONNECT THE ELT/NAV INTERFACE POWER WIRE DIRECTLY TO THE
BATTERY. THE UNIT DRAWS POWER WHENEVER POWER IS APPLIED TO IT AND
COULD DRAIN THE AIRCRAFT BATTERY WHEN NOT IN USE.
(1) See "Figure 8. ELT/NAV Interface Wiring Diagram".
MSB 1
ADD 1
2
ADD 2
3 ADD 3
4
ADD 4
5
ADD 5
6 ADD 6
7
ADD 7
8
ADD 8
9 ADD 9
10
ADD 10
11 ADD 11
12 ADD 12
13
ADD 13
14 ADD 14
15
ADD 15
16
ADD 16
17 ADD 17
18
ADD 18
19
ADD 19
3
20 ADD 20
21
ADD 21
22
ADD 22
23 ADD 23
24
LSB ADD 24
25
GND
26 GND
(2) Fabricate a shielded 4-wire harness long enough to reach between the ELT/NAV Interface and
the ELT, including strain relief and drip loop.
(a) Strip approximately 0.15 in. (3 mm) of insulation from the ELT receptacle end of the four
cable wires and 0.19 in. (5 mm) from the ELT/NAV Interface end.
(b) Dress and tin the bare wire ends to prevent the strands from fraying during terminal
crimping operations.
(3) Fabricate a shielded, twisted pair ARINC 429 data cable.
NOTE:
(a) Strip approximately 0.19 in. (5 mm) of insulation from the ELT end of the twisted pair.
(b) Dress and tin the bare wire ends to prevent the strands from fraying during terminal
crimping operations.
(c) Prepare the twisted pair wires at the navigation system end in accordance with the
navigation system manufacturer's written instructions.
COBHAM AVIONICS WULFSBERG ELECTRONICS
ABBREVIATED COMPONENT MAINTENANCE MANUAL
453-6500
1
2
3
4
5
6
7
2
8
9
9
10
10
12
11
12
13
P1
14
15
USE MINIMUM 22 AWG WIRE
16
P2
17
1 +28 VDC
18
19 3 ARINC 429 - A
4
20 ARINC 429 - B
5 NOT USED
21
22 6 NOT USED
7
23 NOT USED
8 RS-232 RX
24
25 11
26
2
SWITCHABLE POWER SOURCE WITH 2-AMP BREAKER OR
1
SLO-BLO FUSE.
P1 CAPPED IF NOT IN USE.
2
USED ONLY WITH 24-BIT ADDRESS LOCATION PROTOCOLS.
3

Figure 8. ELT/NAV Interface Wiring Diagram

Single. shielded wire for RS-232 data line.
SEE APPLICABLE ELT
WIRING DIAGRAM
2 4 1 3 6 7 5 8
10 +5.6 VDC
9 RXDB ELT
TXDB
12
11 GND
1
FROM ARINC 429
(STANDARD OR GAMA
HIGH OR LOW SPEED)
AIRCRAFT
GROUND (TYP.)
25-69-10
1
20
24
P2
ELT/NAV INTERFACE MATING PLUG
(24-POSITION)
PIN INSERTION VIEW
20
30
10
1
P1
24-BIT ADDRESS PLUG
(31-POSITION)
PIN INSERTION VIEW
Page 46 of 58
APR 06/10
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