Alta EC5 Field Replacement
On rare occasions it makes sense to try to repair broken Alta battery leads in the field rather than replacing the aircraft. This repair should be completed in coordination with Technical Support.
● Snips [from Tool Bag]
● Hemostats [from Tool Bag]
● Replacement EC5 Lead [from Alta Spare Parts bag]
● Soldering Iron
● Solder, the thicker the better
● Electrical Tape [from Repair Parts bag]
1. Remove all power from the Alta.
2. Use the snips to cut the broken EC5 off of the Alta behind the blue housing.
3. Cut the ends of the red and black cables in order to remove the damaged or burned material. When
cutting, try to make the 2 cables even length and as long as possible.
4. Prepare an appropriate replacement EC5 lead. The gender of the connector should match the broken
one that was removed. The Alta battery leads have male contacts with a female casing. Located in the
Alta spare parts bag, will be two EC5 leads of opposite genders or a y-harness which can be cut apart
to procure the appropriate lead.
5. Use the snips to carefully strip away the red and black insulation from the ends of the replacement EC5
lead and the Alta battery lead. Strip approximately 1 inch (2.5 cm) from the end.
6. Twist the 4 exposed wire conductor bundles tightly so that they are not frayed. Then, bend the twisted
ends back on themselves to form hooks.
7. Link the corresponding hooks of the replacement EC5 lead and the Alta battery lead, red to red, black
8. Cut two short pieces of solder approximately 8 inches (2 cm) in length. Wrap these pieces of solder
around the joined wires as tightly as possible in order to secure them temporarily.
9. Use the soldering iron, set to at least 600 F, to permanently join the two sections. Ideally, the two
exposed sections should be flowed with solder completely through. Use the hemostats to hold the joint
together while soldering. The cable will be very hot so also use the hemostats to maneuver the cables
as necessary to flow solder through all parts and sides of the joint.
10. Allow the solder to cool to the touch while keeping the red and black cables separated from each other.
11. Pull test the two joints to make sure the solder joints feel secure and no brittle cracking or crinkling is
12. When satisfied with the joint, send a picture of the repair to Technical Support before continuing.
13. Use electrical tape to cover both joints completely. It is critical that the two conductive wires are not
ever able to contact each other. Use as much tape as necessary.
1. A manual test flight should be conducted without the SR installed. Monitor the battery voltage on the
FPV screen and check the heat of the repaired connection immediately after landing.
2. Once cleared to continue inspections, continue to monitor the battery voltages on both the FPV screen
and on the GCS software. If the two readings begin to differ dramatically, more than 0.5 V, land
immediately. Also continue to check the heat of the repaired connection immediately after landing and
inspect the electrical tape covering the joints.