An md-88 captain noted during their second attempt on takeoff roll that his airspeed indicator was s...

Attributes
ACN	754270
Time
Date	200709
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	MD-88
Operating Under FAR Part	Part 121
Flight Phase	ground : takeoff roll ground : maintenance
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 10000 flight time type : 5000
ASRS Report	754270
Person 2
Affiliation	company : air carrier
Function	maintenance : technician
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : airspeed indicator
Resolutory Action	flight crew : rejected takeoff
Consequence	other other
Factors
Maintenance	performance deficiency : repair performance deficiency : testing performance deficiency : fault isolation
Supplementary
Problem Areas	Maintenance Human Performance Aircraft
Primary Problem	Maintenance Human Performance

Narrative:

Prior to takeoff; all instruments indicated properly. A few seconds after initiating the takeoff roll; the first officer called 'clamp' at 60 KTS. I glanced at my instruments and noticed my airspeed indicator was showing 0 KIAS with an 'off' flag and an 'airspeed' flag. I quickly checked the other instruments and saw no other abnormal indications. Prior to 80 KIAS; I elected to discontinue takeoff. I retarded the throttles to idle and used reverse thrust. Autobrakes and autospoilers worked normally. I turned off runway at taxiway D7. The aircraft slowed in a calm manner. The first officer alerted tower that we were discontinuing takeoff immediately upon my initiation of the procedure. We requested no assistance from crash fire rescue equipment. We returned to the gate; where maintenance repaired the jet. Passenger remained calm at all times. After replacement of the #1 air data computer; we were redispatched. Again; the instruments were normal prior to takeoff. At an estimated 40 KTS my airspeed indicator again displayed an 'off' flag and 'airspeed' flag. I discontinued the takeoff with no further incident. We returned to the gate for maintenance. After this attempt; the flight was canceled. Callback conversation with reporter revealed the following information: reporter stated after initially discontinuing the takeoff roll; maintenance decided to change the air data computer. However; the same air speed indicator again displayed an 'off' flag and an 'a/south' flag during the second takeoff roll. Flight was canceled. Reporter does not know what corrective action maintenance performed to fix the discrepancy.

Original NASA ASRS Text

Title: AN MD-88 CAPTAIN NOTED DURING THEIR SECOND ATTEMPT ON TKOF ROLL THAT HIS AIRSPEED INDICATOR WAS SHOWING '0' KIAS WITH AN 'OFF' FLAG AND AN 'A/S' FLAG. FLIGHT CANCELED.

Narrative: PRIOR TO TKOF; ALL INSTS INDICATED PROPERLY. A FEW SECONDS AFTER INITIATING THE TKOF ROLL; THE FO CALLED 'CLAMP' AT 60 KTS. I GLANCED AT MY INSTS AND NOTICED MY AIRSPD INDICATOR WAS SHOWING 0 KIAS WITH AN 'OFF' FLAG AND AN 'AIRSPD' FLAG. I QUICKLY CHKED THE OTHER INSTS AND SAW NO OTHER ABNORMAL INDICATIONS. PRIOR TO 80 KIAS; I ELECTED TO DISCONTINUE TKOF. I RETARDED THE THROTTLES TO IDLE AND USED REVERSE THRUST. AUTOBRAKES AND AUTOSPOILERS WORKED NORMALLY. I TURNED OFF RWY AT TXWY D7. THE ACFT SLOWED IN A CALM MANNER. THE FO ALERTED TWR THAT WE WERE DISCONTINUING TKOF IMMEDIATELY UPON MY INITIATION OF THE PROC. WE REQUESTED NO ASSISTANCE FROM CFR. WE RETURNED TO THE GATE; WHERE MAINT REPAIRED THE JET. PAX REMAINED CALM AT ALL TIMES. AFTER REPLACEMENT OF THE #1 ADC; WE WERE REDISPATCHED. AGAIN; THE INSTS WERE NORMAL PRIOR TO TKOF. AT AN ESTIMATED 40 KTS MY AIRSPD INDICATOR AGAIN DISPLAYED AN 'OFF' FLAG AND 'AIRSPD' FLAG. I DISCONTINUED THE TKOF WITH NO FURTHER INCIDENT. WE RETURNED TO THE GATE FOR MAINT. AFTER THIS ATTEMPT; THE FLT WAS CANCELED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: REPORTER STATED AFTER INITIALLY DISCONTINUING THE TAKEOFF ROLL; MAINT DECIDED TO CHANGE THE AIR DATA COMPUTER. HOWEVER; THE SAME AIR SPEED INDICATOR AGAIN DISPLAYED AN 'OFF' FLAG AND AN 'A/S' FLAG DURING THE SECOND TAKEOFF ROLL. FLIGHT WAS CANCELED. REPORTER DOES NOT KNOW WHAT CORRECTIVE ACTION MAINT PERFORMED TO FIX THE DISCREPANCY.

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.

An md-88 captain noted during their second attempt on takeoff roll that his airspeed indicator was showing '0' KIAS with an 'off' flag and an 'a/south' flag. Flight canceled.