A B737-700's pilot-static system malfunctioned causing airspeed and altimeter errors. The flight rem...

Narrative:

On the previous flight we had had an erroneous airspeed indication. We determined that the #2 airspeed indicator was in error by referring to the standby airspeed indicator and the captain's airspeed indicator. After talking with dispatch and maintenance and considering the forecast for our destination; we decided to divert. We had to burn 45 minutes of fuel prior to landing at our divert airport. During those 45 minutes; the problem corrected itself. Maintenance checked the pitot static system and changed the #2 adiru. On this flight we started having the same problem as we climbed through 12;000.' it started with #2 airspeed indicator giving incorrect indications followed by incorrect altitude on #2 altimeter. Again we verified that the problem was with the first officer's side. We calculated fuel burn to our destination below rsvm. After talking with maintenance and dispatch and considering the forecast for our departure airport and destination; we decided to continue to our destination at FL270. Again the problem corrected itself after about 45 minutes.

Original NASA ASRS Text

Title: A B737-700's pilot-static system malfunctioned causing airspeed and altimeter errors. The flight remained clear of RVSM airspace and the system returned to normal functioning after about forty-five minutes at cruise.

Narrative: On the previous flight we had had an erroneous airspeed indication. We determined that the #2 airspeed indicator was in error by referring to the standby airspeed indicator and the Captain's airspeed indicator. After talking with Dispatch and Maintenance and considering the forecast for our destination; we decided to divert. We had to burn 45 minutes of fuel prior to landing at our divert airport. During those 45 minutes; the problem corrected itself. Maintenance checked the pitot static system and changed the #2 ADIRU. On this flight we started having the same problem as we climbed through 12;000.' It started with #2 airspeed indicator giving incorrect indications followed by incorrect altitude on #2 altimeter. Again we verified that the problem was with the First Officer's side. We calculated fuel burn to our destination below RSVM. After talking with Maintenance and Dispatch and considering the forecast for our departure airport and destination; we decided to continue to our destination at FL270. Again the problem corrected itself after about 45 minutes.

Data retrieved from NASA's ASRS site as of April 2012 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	836340
Time
Date	200905
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	B737-700
Operating Under FAR Part	Part 121
Flight Phase	Climb
Flight Plan	IFR
Component
Aircraft Component	Pitot-Static System
Person 1
Function	First Officer Pilot Not Flying
Experience	Flight Crew Last 90 Days 242
Person 2
Function	Pilot Flying Captain
Experience	Flight Crew Last 90 Days 199 Flight Crew Type 5000
Events
Anomaly	Aircraft Equipment Problem Critical

A B737-700's pilot-static system malfunctioned causing airspeed and altimeter errors. The flight remained clear of rvsm airspace and the system returned to normal functioning after about forty-five minutes at cruise.