4300 Attitude Indicator 4300-411 Mid-Continent Electric Attitude Indicator 4300-411. Mid-Continent 4300 Series Lifesaver Electric Attitude Indicator with Standby battery system provides up to one hour of emergency attitude reference in the event of aircraft power failure, a safe alternative to unreliable vacuum systems. This Mid-Continent Electric Attitude Indicator 4300-411 is an exceptional Value – 7,500 hours MTBF, which is more than double the life of most electric gyros. Perfect for use as a primary or standby artificial horizon in fixed-wing aircraft and helicopters. The 10–32 volt DC operation is for use in both 14 and 28 volt aircraft. Anti-reflective glass enhances visibility and reduces fatigue. Approved to FAA TSO-C4c and RTCA/DO-160D certified and qualified to DO-160 for helicopter vibration. Lifesaver® self-contained battery backup features: One hour of emergency power* Built-in annunciation Internal emergency lighting Versions available to match existing instrument/EFIS displays A safe alternative to unreliable vacuum systems Ideal primary or standby artificial horizon in fixed-wing and helicopter applications Single 4-pin connector installation 7,500 hours MTBF — more than double the life of most electric gyros 10–32 volt DC operation for use in both 14 and 28 volt aircraft Field-replaceable lighting Anti-reflective glass enhances visibility and reduces pilot fatigue FAA TSO-C4c certified and RTCA DO-160D qualified DO-160 qualified for helicopter vibration Designed and built in Wichita, Kansas, USA One-year limited warranty * Fully charged and properly maintained battery. See installation manual.