DC9 crew had various cockpit instrumentation anomalies.

Attributes
ACN	475250
Time
Date	200006
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : msp.airport
State Reference	MN
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	DC-9 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	ground : parked
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi pilot : flight engineer
Experience	flight time last 90 days : 250 flight time total : 17000 flight time type : 7500
ASRS Report	475250
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : multi engine pilot : commercial
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa other flight crewb
Resolutory Action	other
Supplementary
Problem Areas	FAA Company Aircraft
Primary Problem	Aircraft

Narrative:

While sitting at gate in msp, the radar altimeters began flagging and sweeping full scale. I made a PA to the cabin asking that all ped's (passenger electronic devices) be shut off and stowed and the radar altimeters returned to normal. Again in mso shortly after blocking in, both radar altimeters began flagging and sweeping and the GPWS began hooting 'pull up, pull up.' again I made a 'ped off' PA and once again the interference ceased and the radar altimeters returned to normal and tested ok.

Original NASA ASRS Text

Title: DC9 CREW HAD VARIOUS COCKPIT INSTRUMENTATION ANOMALIES.

Narrative: WHILE SITTING AT GATE IN MSP, THE RADAR ALTIMETERS BEGAN FLAGGING AND SWEEPING FULL SCALE. I MADE A PA TO THE CABIN ASKING THAT ALL PED'S (PAX ELECTRONIC DEVICES) BE SHUT OFF AND STOWED AND THE RADAR ALTIMETERS RETURNED TO NORMAL. AGAIN IN MSO SHORTLY AFTER BLOCKING IN, BOTH RADAR ALTIMETERS BEGAN FLAGGING AND SWEEPING AND THE GPWS BEGAN HOOTING 'PULL UP, PULL UP.' AGAIN I MADE A 'PED OFF' PA AND ONCE AGAIN THE INTERFERENCE CEASED AND THE RADAR ALTIMETERS RETURNED TO NORMAL AND TESTED OK.

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.