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B737-300 was dispatched with left #2 windshield heat inoperative per the MEL. Aircraft was routed in known or forecast icing conditions.
| Attributes | |
| ACN | 701467 |
| Time | |
| Date | 200606 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | oversight : coordinator |
| Qualification | technician : powerplant technician : airframe |
| Experience | maintenance lead technician : 18 |
| ASRS Report | 701467 |
| Person 2 | |
| Affiliation | other |
| Function | maintenance : technician |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : non compliance with mel non adherence : published procedure non adherence : far other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : window heat fail light other other : 3 |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other other |
| Factors | |
| Maintenance | contributing factor : manuals contributing factor : schedule pressure contributing factor : non availability of parts performance deficiency : logbook entry performance deficiency : non compliance with legal requirements |
| Supplementary | |
| Problem Areas | Environmental Factor Maintenance Human Performance Aircraft Chart Or Publication |
| Primary Problem | Maintenance Human Performance |
Narrative:
The R-1 window heat circuit breaker popped and would not reset; inbound from ZZZ. Contract maintenance (ZZZ) swapped #3 and #4 controllers; for troubleshooting. The problem followed. R-1 window heat; now good. The L-2 window heat was now inoperative. Misread MEL (unintentionally). I thought #2 on the MEL stood for the R-2 and L-2 window heat. I MEL'ed the L-2 window heat and advised dispatch. Local dispatch called and advised me of incorrect MEL used and unable to dispatch. Called ZZZ maintenance to advise them to prepare to correct problem and they advised me the aircraft had departed and airborne. I then advised dispatch and dispatch then rerted the aircraft safely around the WX and the aircraft arrived at ZZZ without incident.
Original NASA ASRS Text
Title: B737-300 WAS DISPATCHED WITH L #2 WINDSHIELD HEAT INOP PER THE MEL. ACFT WAS ROUTED IN KNOWN OR FORECAST ICING CONDITIONS.
Narrative: THE R-1 WINDOW HEAT CIRCUIT BREAKER POPPED AND WOULD NOT RESET; INBOUND FROM ZZZ. CONTRACT MAINT (ZZZ) SWAPPED #3 AND #4 CONTROLLERS; FOR TROUBLESHOOTING. THE PROB FOLLOWED. R-1 WINDOW HEAT; NOW GOOD. THE L-2 WINDOW HEAT WAS NOW INOP. MISREAD MEL (UNINTENTIONALLY). I THOUGHT #2 ON THE MEL STOOD FOR THE R-2 AND L-2 WINDOW HEAT. I MEL'ED THE L-2 WINDOW HEAT AND ADVISED DISPATCH. LCL DISPATCH CALLED AND ADVISED ME OF INCORRECT MEL USED AND UNABLE TO DISPATCH. CALLED ZZZ MAINT TO ADVISE THEM TO PREPARE TO CORRECT PROB AND THEY ADVISED ME THE ACFT HAD DEPARTED AND AIRBORNE. I THEN ADVISED DISPATCH AND DISPATCH THEN RERTED THE ACFT SAFELY AROUND THE WX AND THE ACFT ARRIVED AT ZZZ WITHOUT INCIDENT.
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.