B737-700
Workload; Troubleshooting; Human-Machine Interface; Distraction; Confusion; Communication Breakdown
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural FAR; Inflight Event / Encounter Weather / Turbulence
Aircraft Equipment Problem Dissipated; Flight Crew FLC complied w / Automation / Advisory; General Maintenance Action
Aircraft; Weather
The following occurred in order at FL 390 in IMC conditions:1. IAS disagree (First Officer IAS showed 100 KIAS.  Captain HUD and Standby all normal)2. Engine one and two EEC faults3. Altimeter disagree (First Officer altimeter off by 450'. Captain HUD and Standby all normal)We completed all three QRH checklists in the order of occurrence. At the time of the event we were IMC. Upon completion of all QRH checklists; we were VMC and the First Officer's IAS and altimeter returned to normal. Dispatch was notified via ACARS.I am filing this report because we never notified ATC of altimeter error in RVSM airspace (due to being preoccupied with the three QRH checklists and the fact that the First Officer's altimeter returned to normal).
While IMC at FL390 both B737-700 engine EEC's faulted; the First Officer's airspeed and altimeter dropped while the Captain's instruments remained normal. When VMC conditions returned; the faults were removed.