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A B737-300 rejected takeoff due to difference in airspds between #1 and #2 airspeed indicators caused by #2 pitot line not connected to the #2 air data computer.
| Attributes | |
| ACN | 471689 |
| Time | |
| Date | 199911 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : parked ground : maintenance |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : powerplant technician : airframe |
| Experience | maintenance technician : 32 |
| ASRS Report | 471689 |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper maintenance non adherence : published procedure |
| Independent Detector | aircraft equipment other aircraft equipment : airspeed indications |
| Resolutory Action | flight crew : rejected takeoff |
| Consequence | other |
| Factors | |
| Maintenance | contributing factor : schedule pressure performance deficiency : testing performance deficiency : non compliance with legal requirements performance deficiency : logbook entry performance deficiency : inspection performance deficiency : repair |
| Supplementary | |
| Problem Areas | Maintenance Human Performance Aircraft |
| Primary Problem | Maintenance Human Performance |
Narrative:
Aircraft returned to gate after rejected takeoff due to excessive airspeed split between #1 and #2 airspeed indicators. Found pitot line quick disconnect was not connected at #2 air data computer. Reconnected same, system checked ok. Mistakenly stated that I had replaced line instead of reconnecting line. Quick disconnect type fitting was on line, no leak check required. Entry made into maintenance computer system, however, correctly stated that pitot line was reconnected.
Original NASA ASRS Text
Title: A B737-300 REJECTED TKOF DUE TO DIFFERENCE IN AIRSPDS BTWN #1 AND #2 AIRSPD INDICATORS CAUSED BY #2 PITOT LINE NOT CONNECTED TO THE #2 AIR DATA COMPUTER.
Narrative: ACFT RETURNED TO GATE AFTER REJECTED TKOF DUE TO EXCESSIVE AIRSPD SPLIT BTWN #1 AND #2 AIRSPD INDICATORS. FOUND PITOT LINE QUICK DISCONNECT WAS NOT CONNECTED AT #2 AIR DATA COMPUTER. RECONNECTED SAME, SYS CHKED OK. MISTAKENLY STATED THAT I HAD REPLACED LINE INSTEAD OF RECONNECTING LINE. QUICK DISCONNECT TYPE FITTING WAS ON LINE, NO LEAK CHK REQUIRED. ENTRY MADE INTO MAINT COMPUTER SYS, HOWEVER, CORRECTLY STATED THAT PITOT LINE WAS RECONNECTED.
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.