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B-737 aircraft had air turn back due to loss of #1 air data system. Captain's pitot hose connector on the air data module was found disconnected.
| Attributes | |
| ACN | 738866 |
| Time | |
| Date | 200705 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : airframe technician : powerplant |
| ASRS Report | 738866 |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper maintenance non adherence : far non adherence : published procedure |
| Independent Detector | aircraft equipment other aircraft equipment : air data system |
| Resolutory Action | other |
| Consequence | other |
| Factors | |
| Maintenance | contributing factor : schedule pressure performance deficiency : logbook entry performance deficiency : non compliance with legal requirements performance deficiency : testing performance deficiency : installation |
| Supplementary | |
| Problem Areas | Maintenance Human Performance Aircraft Company |
| Primary Problem | Maintenance Human Performance |
Narrative:
Aircraft X air turn backed to ZZZ due to loss of #1 air data system. Upon arrival the captain's pitot hose connector on the air data module (adm) was found disconnected due to earlier troubleshooting of a WX radar discrepancy. The radar WX transceiver was removed and reinstalled for troubleshooting. The pitot hose connector was removed due to it was difficult to remove the transceiver and to reduce the risk of damaging the adm. After securing the pitot hose connector and performing a successful operational check of the #1 air data system I released the aircraft for service. I failed to have the aircraft recertified to CAT 3 status. Because of the situation of an air return; I was distraction and stressed that my lack of awareness was the reason of an aircraft returning due to substandard maintenance on my part. It is unknown to me if the aircraft had been recertified to CAT 3 status.
Original NASA ASRS Text
Title: B-737 ACFT HAD AIR TURN BACK DUE TO LOSS OF #1 AIR DATA SYSTEM. CAPTAIN'S PITOT HOSE CONNECTOR ON THE AIR DATA MODULE WAS FOUND DISCONNECTED.
Narrative: ACFT X AIR TURN BACKED TO ZZZ DUE TO LOSS OF #1 AIR DATA SYS. UPON ARR THE CAPT'S PITOT HOSE CONNECTOR ON THE AIR DATA MODULE (ADM) WAS FOUND DISCONNECTED DUE TO EARLIER TROUBLESHOOTING OF A WX RADAR DISCREPANCY. THE RADAR WX TRANSCEIVER WAS REMOVED AND REINSTALLED FOR TROUBLESHOOTING. THE PITOT HOSE CONNECTOR WAS REMOVED DUE TO IT WAS DIFFICULT TO REMOVE THE TRANSCEIVER AND TO REDUCE THE RISK OF DAMAGING THE ADM. AFTER SECURING THE PITOT HOSE CONNECTOR AND PERFORMING A SUCCESSFUL OPERATIONAL CHK OF THE #1 AIR DATA SYS I RELEASED THE ACFT FOR SVC. I FAILED TO HAVE THE ACFT RECERTIFIED TO CAT 3 STATUS. BECAUSE OF THE SITUATION OF AN AIR RETURN; I WAS DISTR AND STRESSED THAT MY LACK OF AWARENESS WAS THE REASON OF AN ACFT RETURNING DUE TO SUBSTANDARD MAINT ON MY PART. IT IS UNKNOWN TO ME IF THE ACFT HAD BEEN RECERTIFIED TO CAT 3 STATUS.
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.