A B737-300 crew reported many first officer instruments; including the attitude indicator; displayed...

Narrative:

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.

Original NASA ASRS Text

Title: 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.

Narrative: 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.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

Attributes
ACN	1463735
Time
Date	201707
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.TRACON
State Reference	US
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Flight Phase	Initial Climb
Flight Plan	IFR
Component
Aircraft Component	Attitude Indicator(Gyro/Horizon/ADI)
Person 1
Function	Pilot Not Flying First Officer
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	Pilot Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Critical Inflight Event / Encounter Weather / Turbulence

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.