Narrative:

First officer was flying eagul arrival runway 8 into phx. We got wake turbulence from aircraft ahead. Correcting for the wake distracted us and we descended below the 9;000 ft restriction. Corrected back to 9;000 ft. Asked ATC if altitude was a problem and he said no.

Google
 

Original NASA ASRS Text

Title: An A320 Captain reported encountering wake turbulence on a PHX arrival resulting in an altitude deviation.

Narrative: First Officer was flying EAGUL arrival Runway 8 into PHX. We got wake turbulence from aircraft ahead. Correcting for the wake distracted us and we descended below the 9;000 FT restriction. Corrected back to 9;000 FT. Asked ATC if altitude was a problem and he said no.

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.