B737 captain reported cascading system failures and intermittent electrical failures.

Attributes
ACN	1579314
Time
Date	201809
Environment
Flight Conditions	IMC
Aircraft 1
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Component
Aircraft Component	Air Data Computer
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument
Experience	Flight Crew Total 20000 Flight Crew Type 8815
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy Inflight Event / Encounter Weather / Turbulence

Narrative:

Cascading systems failure in which QRH does not address. Also ipad QRH did not operate. No altimeter and airspeed vvi indicators were reliable with over 200+ knots difference. VNAV inoperative. Engine light illuminated. Flight control lights illuminated. IMC at night with severe thunderstorms in all phases of flight path. Unable to land on primary runways in use due to GPS/RNAV only approaches without VNAV. Unable to land at alternate airport due to intermittent loss of electrical power for raw data approach and runway lights. Landed with tailwinds exceeding 20 knots; [and] only option on a raw data approach with ground based ATC radar assisting with airspeed and altitude callouts every minute until touchdown. Maintenance bite test indicated dual air data computer failure. I experienced the same exact scenario on a different aircraft with [reports] filed.

Original NASA ASRS Text

Title: B737 Captain reported cascading system failures and intermittent electrical failures.

Narrative: Cascading systems failure in which QRH does not address. Also iPad QRH did not operate. No Altimeter and Airspeed VVI indicators were reliable with over 200+ knots difference. VNAV inoperative. ENG light illuminated. Flight Control lights illuminated. IMC at night with severe thunderstorms in all phases of flight path. Unable to land on primary runways in use due to GPS/RNAV only approaches without VNAV. Unable to land at alternate airport due to intermittent loss of electrical power for raw data approach and runway lights. Landed with tailwinds exceeding 20 knots; [and] only option on a raw data approach with ground based ATC Radar assisting with airspeed and altitude callouts every minute until touchdown. Maintenance BITE test indicated dual Air Data computer failure. I experienced the same exact scenario on a different aircraft with [reports] filed.

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.