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A B737-400 returned to the field due to loss of first officer's airspeed and altimeter data caused by pitot and static lines not connected to the air data computer.
| Attributes | |
| ACN | 504153 |
| Time | |
| Date | 200103 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| 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 | B737-400 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : parked |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : powerplant technician : fcc technician : airframe |
| Experience | maintenance avionics : 34 |
| ASRS Report | 504153 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : powerplant technician : airframe technician : fcc |
| Experience | maintenance avionics : 15 maintenance technician : 15 |
| ASRS Report | 504392 |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper documentation maintenance problem : improper maintenance non adherence : published procedure non adherence : far |
| Independent Detector | aircraft equipment other aircraft equipment : loss of a/s and altitude other flight crewa other flight crewb |
| Resolutory Action | flight crew : diverted to another airport |
| Consequence | other other |
| Factors | |
| Maintenance | contributing factor : schedule pressure contributing factor : work cards performance deficiency : testing performance deficiency : installation performance deficiency : inspection performance deficiency : scheduled maintenance |
| Supplementary | |
| Problem Areas | Chart Or Publication Aircraft Maintenance Human Performance |
| Primary Problem | Maintenance Human Performance |
| Situations | |
| Publication | MAINTENANCE MANUAL |
Narrative:
Aircraft returned to the field with the pilot reporting he had lost airspeed and altimeter information on the copilot's side after departure from xyz. Upon examination of the #2 air data computer, I noticed the pitot and static lines were not connected. I re-racked the #2 air data computer and connected the lines. In my haste to return the aircraft to service, I was vague in my signoff. Supplemental information from acn 504392: the cause was loose pitot static lines on air data computer. I understand this is the 4TH return to field due to this cause.
Original NASA ASRS Text
Title: A B737-400 RETURNED TO THE FIELD DUE TO LOSS OF FO'S AIRSPD AND ALTIMETER DATA CAUSED BY PITOT AND STATIC LINES NOT CONNECTED TO THE AIR DATA COMPUTER.
Narrative: ACFT RETURNED TO THE FIELD WITH THE PLT RPTING HE HAD LOST AIRSPD AND ALTIMETER INFO ON THE COPLT'S SIDE AFTER DEP FROM XYZ. UPON EXAMINATION OF THE #2 AIR DATA COMPUTER, I NOTICED THE PITOT AND STATIC LINES WERE NOT CONNECTED. I RE-RACKED THE #2 AIR DATA COMPUTER AND CONNECTED THE LINES. IN MY HASTE TO RETURN THE ACFT TO SVC, I WAS VAGUE IN MY SIGNOFF. SUPPLEMENTAL INFO FROM ACN 504392: THE CAUSE WAS LOOSE PITOT STATIC LINES ON AIR DATA COMPUTER. I UNDERSTAND THIS IS THE 4TH RETURN TO FIELD DUE TO THIS CAUSE.
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.