A300 rejects takeoff due to zero IAS on captain's asi. Bug found in pitot.

Attributes
ACN	754639
Time
Date	200709
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	A300
Operating Under FAR Part	Part 121
Flight Phase	ground : takeoff roll
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
ASRS Report	754639
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : ias indicator other flight crewa
Resolutory Action	flight crew : rejected takeoff
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

I (captain) initiated takeoff with all indications normal until 80 KT call. At that point I verified the airspeed indication on my pfd; and found it pegged at the bottom of the scale on 0 KTS airspeed. I stated 'no airspeed;' and initiated a rejected takeoff. Airspeed topped out at 90 KTS before deceleration began with maximum automatic-brakes working as advertised. Exited runway and returned to blocks. Maintenance cleaned a fairly large bug out of the captain's system pitot tube and verified the pitot; plumbing; and associated air data computer were working properly. I do not know if pitot covers were used as the aircraft sat at the gateway all day. They may have been; however; there was no logbook entry indicating covers being installed or removed.

Original NASA ASRS Text

Title: A300 REJECTS TKOF DUE TO ZERO IAS ON CAPTAIN'S ASI. BUG FOUND IN PITOT.

Narrative: I (CAPT) INITIATED TKOF WITH ALL INDICATIONS NORMAL UNTIL 80 KT CALL. AT THAT POINT I VERIFIED THE AIRSPD INDICATION ON MY PFD; AND FOUND IT PEGGED AT THE BOTTOM OF THE SCALE ON 0 KTS AIRSPD. I STATED 'NO AIRSPD;' AND INITIATED A REJECTED TKOF. AIRSPD TOPPED OUT AT 90 KTS BEFORE DECELERATION BEGAN WITH MAX AUTO-BRAKES WORKING AS ADVERTISED. EXITED RWY AND RETURNED TO BLOCKS. MAINT CLEANED A FAIRLY LARGE BUG OUT OF THE CAPT'S SYS PITOT TUBE AND VERIFIED THE PITOT; PLUMBING; AND ASSOCIATED ADC WERE WORKING PROPERLY. I DO NOT KNOW IF PITOT COVERS WERE USED AS THE ACFT SAT AT THE GATEWAY ALL DAY. THEY MAY HAVE BEEN; HOWEVER; THERE WAS NO LOGBOOK ENTRY INDICATING COVERS BEING INSTALLED OR REMOVED.

Data retrieved from NASA's ASRS site as of January 2009 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.