Flight Crew Air Transport Pilot (ATP)
Distraction; Situational Awareness
Aircraft Equipment Problem Critical; Inflight Event / Encounter Weather / Turbulence
Flight Crew Took Evasive Action; Flight Crew Landed in Emergency Condition; Flight Crew Diverted; General Maintenance Action
Aircraft; Environment - Non Weather Related; Weather
Before takeoff; we had a single channel autoslat failure during Recall check. We cleared the runway and MEL'd this item. After departure sometime below 10;000 feet we noticed the standby attitude indicator was displaying a red flag. Shortly thereafter the standby attitude indicator began to wobble and keeled over for good. All other indications were normal at this time; so we notified maintenance and dispatch and pressed on towards our filed destination. Shortly after reaching cruise; I noticed many of my instruments had red flags including my primary attitude indicator. We were down to one known good source of attitude information at this time and since we were IMC; we decided to immediately [advise ATC] and get radar vectors to nearest VMC. Initially we decided to go to ZZZ; but on the descent I saw ZZZ1 just off the right side of the aircraft and completely in the clear; so we changed the plan and diverted into to [that airport]. The remainder of the flight was uneventful. We then swapped aircraft and took our passengers on to our filed destination.
At cruise; First Officers attitude and airspeed red flagged. We had just entered night IMC into storms in the northeast with one reliable attitude indicator. We contacted Dispatch; and ATC; requested a turn west to known high VFR. [Advised ATC] and landed in a nearby airport.
A B737-300 crew reported many First Officer instruments; including the attitude indicator; displayed red flags so the crew; now in night IMC with one attitude source; diverted to a nearby VMC airport.