Backshell Assembly - Garmin GI 275 Installation Manual

4.4 Backshell Assembly

Prepare the shielded cables to be connected to the LRU in accordance with Section 4.1.1, then terminate
the cables to the LRU jackscrew backshell assembly using the following procedure. Refer to Figure 4-19
and Figure 4-20.
1. Terminate the crimped pin/socket contacts (4) in the D-sub connector (7) in accordance with the
aircraft wiring drawings.
2. Place the smooth side of the backshell strain relief clamp (9) across the cable bundle and secure
using three 4-40 x 0.375 pan head screws (10).
CAUTION
Place smooth side of strain relief (9) across cable bundle. DO NOT place grooved side
across cable bundle. Placing the grooved side of the strain relief across the cable bundle
may damage wires.
3. Terminate the ring terminals (6) to the tapped holes on the backshell (8) by placing items on the
8-32 x 0.312 pan head shield terminal screw (13) in the following order before finally inserting the
screw into the tapped holes on the shield block:
a. split washer (14)
b. flat washer (15)
c. first ring terminal (6)
d. second ring terminal (6) (if needed)
NOTE
Each tapped hole on the backshell (8) may accommodate only two ring terminals (6). It is
preferred that a maximum of two wires (2) be terminated per ring terminal. Two wires per
ring terminal will necessitate the use of a ring terminal, #8, insulated, 14-16 AWG
(MS25036-153). If only a single wire is left or if only a single wire is needed for this
connector a ring terminal, #8, insulated, 18-22 AWG (MS25036-149) can accommodate
this single wire. If more wires exist for the connector than two per ring terminal, it is
permissible to terminate three wires per ring terminal.
190-02246-14
Rev. 11
GI 275 STC EIS & MFD Installation Manual
Page 4-25