Game Composites GB1 GameBird, Maintenance Manual

Page: 93 / 269

Maintenance Manual GB1 GameBird
Page date: April 24, 2020
24-28
Terminal blocks and studs
1. Check bus terminal blocks and studs for general condition and security of all attachments and
terminals. Terminal blocks that exhibit corrosion, even in limited amounts, should be disassembled
and cleaned before reinstallation. Bigfoot studs cannot be removed.
2. Ensure nuts on all studs are tight.
3. Check labels of terminal blocks and Bigfoot studs against wiring diagrams in section 24-03 . Replace if
legibility becomes questionable.
Grounding
1. Measure resistance between GND1, GND2, GND3 and engine mount. A very small value is expected
(in a scale of 10
-2
Ω)
2. Check all GND studs are free from paint, dirt, oil or corrosion.
3. Only use galvanized or aluminum washers on GND studs.
Fuses/diodes and fuse/diode holders
1. Check security of connections to holders.
2. Inspect for the presence of corrosion and evidence of overheating on fuses/diodes and holders. If
evidence of overheating is found, check correct ratings. Replace as required according to the wiring
diagrams in section
24-03 .
Circuit breakers and toggle switches
1. Replace as required, when frequent tripping is observed.
Battery
1. Battery: manufacturer’s recommendation must be followed.
2. Check condition of battery clamps for sign of damage.
3. Inspect battery terminals and quick-disconnect charging plug for evidence of corrosion, pitting, arcing
and burns.
4. Clean clamps and terminals as required.
Electrical System Troubleshooting Guide
Before troubleshooting for any sub-systems or equipment:
1. Ensure the battery is fully charged. Lack of power voltage may result in inaccurate measurement.
2. Turn all switches OFF. Measure the resistance between:
- Battery negative terminal (-) and ground stud GN1 in battery compartment;
- Battery negative terminal (-) and ground stud GN2 behind RH rear side console cover;
- Battery negative terminal (-) and engine case.
Measurements over 0.5 Ohm would be cause for investigation. In this case, check the engine ground
wire, battery ground wire and wire between GN1 and GN2 for loose or contaminated connections,
broken conductors or bad crimp joins. If the measurements are less than 0.5 Ohm, any of these 4
points may be used as reference (-) for subsequent measurements.
3. Turn all switches OFF. Measure resistance between BUS1 in the battery compartment and BUS2
behind RH rear side console cover. Measurements should be investigated as above.
Battery
If battery does not provide enough power to start the engine:
Check for shortcut in the aircraft electrical system: Turn all switches to OFF. Fully charge battery.
Connect ampere meter in series between stud GN1 or engine case to battery ground (-). Use range
not greater than 1 amp.
Any reading other than 0 indicates a drain in the electrical system.