<< >> NASA ASRS Report 843086, July 2009

A300 captain experienced airspeed indicator failure at FL280. Switching to air data computer #2 cures the problem; but decision was made to divert for an equipment change.

Attributes
ACN	843086
Time
Date	200907
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Daylight
Aircraft 1
Make Model Name	A300
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Route In Use	Oceanic
Flight Plan	IFR
Component
Aircraft Component	Airspeed Indicator
Person 1
Function	Captain Pilot Flying
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

At FL280; tat -1C; sat -27C and light precipitation. Captain's pfd airspeed indication became unreliable and fluctuated between zero and mach .76 a couple of times; mostly towards zero. Standby and first officer's indications appeared normal. Followed unreliable airspeed checklist and after selecting captain's side to air data computer #2; captain's airspeed back to normal. Contacted dispatch and diverted for equipment change. Declared emergency for overweight landing.

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Original NASA ASRS Text

Title: A300 Captain experienced airspeed indicator failure at FL280. Switching to ADC #2 cures the problem; but decision was made to divert for an equipment change.

Narrative: At FL280; TAT -1C; SAT -27C and light precipitation. Captain's PFD airspeed indication became unreliable and fluctuated between zero and Mach .76 a couple of times; mostly towards zero. Standby and First Officer's indications appeared normal. Followed unreliable airspeed checklist and after selecting Captain's side to ADC #2; Captain's airspeed back to normal. Contacted Dispatch and diverted for equipment change. Declared emergency for overweight landing.

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.