Blow up print
Problems with sb schematic.
1. Fuse HZ121 did not exist. There was a fuse labels S54321?????. In its place. It was covered with heat shrink and capped. This means the APU contactor engaged logic lightwire was disabled before I got to it. We dealt with this by ordering a new fuse from Cessna, and leaving the old wire capped and labeled.
2. The wire from PT003 pin W to JZ013 pin 3, did not exist on any service bulliten drawing. That wire is “other side start”. After reviewing high serial number wire diagrams, we verified that we should leave that wire in place.
3. The relay that we added near the copilots elbow, KF022. was partially wired. I could not remove the relay from the socket to do a complete ringout