Passenger cell phone causes navigational display units to oscillate full scale during flight.

Attributes
ACN	301238
Time
Date	199504
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : zzz
State Reference	US
Aircraft 1
Controlling Facilities	artcc : zzz
Operator	common carrier : air carrier
Make Model Name	MD-80 Series (DC-9-80) Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	301238
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	non adherence : clearance other anomaly other other spatial deviation
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Cell phone use in-flight. Both navigational display CDI's started to oscillate off scale to the right and then back to center. Had flight attendants do cabin sweep and found a first class passenger using his own unit. When turned off, navigation system returned to normal.

Original NASA ASRS Text

Title: PAX CELL PHONE CAUSES NAVIGATIONAL DISPLAY UNITS TO OSCILLATE FULL SCALE DURING FLT.

Narrative: CELL PHONE USE INFLT. BOTH NAVIGATIONAL DISPLAY CDI'S STARTED TO OSCILLATE OFF SCALE TO THE R AND THEN BACK TO CTR. HAD FLT ATTENDANTS DO CABIN SWEEP AND FOUND A FIRST CLASS PAX USING HIS OWN UNIT. WHEN TURNED OFF, NAV SYS RETURNED TO NORMAL.

Data retrieved from NASA's ASRS site as of July 2007 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.