Equipment Installation Manual,
GDC31 Roll Steering Converter
Mounting Considerations
The GDC31 Roll Steering Converter can mount in the avionics bay, shelf or other suitable structure. It
can be mounted in any orientation.
The optional Isolation Coupler can mount in the avionics bay, shelf or other suitable structure. It can be
mounted in any orientation.
Attach the GDC31 and Isolation Coupler to suitable structure using the following hardware.
Screw, 8-32 X 1/2” MS35206-245
Flat Washer, #8 AN960-8L
Lock Washer, #8 MS35338-42
Nut, 8-32 MS35649-282
AN or MS self-locking nut plates may be used in place of the nut and lock washer specified above.
Mount the GPS/HDG mode annunciator / switch as near as practical to the autopilot mode controller. If
there is insufficient space there, mount the mode annunciator within the pilot’s primary field of view, near
the HSI or CDI.
Wiring Considerations
Wiring should be done in accordance with AC 43.13-1B, Chapter 11. Refer to the typical interconnect
diagram later in this manual for specifics. Use 22 to 24 AWG wire for all connections.
Fabricate wiring harness; refer to the interconnect diagrams and pin description. Test all the wiring for
continuity and for shorts. Insure aircraft power is on the correct pins of J1; refer to Table 6. Install slide
latch assembly onto J1 using instructions found later in this manual.
The mode annunciator/switch, P10280, comes pre-configured for 28V operation. For 14V operation,
perform the following steps:
1. Pull firmly on the edges of the lens to disengage the lamp assembly from the body. The lamp
assembly will hinge out and away from the body.
2. Remove and discard the four existing lamps, and replace with the four 14V lamps, P10301,
contained in the kit.
3. Push the lens firmly back into the body.
1049-2510-01 G.doc
1049-2510-01
Rev G Page 15 of 47
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