M-20 B/C Ranger
Flight Crew Instrument; Flight Crew Private
Flight Crew Last 90 Days 25; Flight Crew Total 1900; Flight Crew Type 1600
Other / Unknown
Aircraft Equipment Problem Critical
General None Reported / Taken
Human Factors; Aircraft
[I] picked up airplane after a completed annual. Firm had run down battery 2 during annual which had caused some loaded information in the right screen to be compromised. This caused left screen to malfunction. Later in flight it caused all navigation and communication to malfunction.
M20 pilot reports departing on an IFR flight plan in VMC with one battery completely discharged. This caused some loaded information in the right screen to be compromised then the left screen malfunctioned. Later in flight it caused all navigation and communication to malfunction.