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A B737-300 had captain's HSI dome and ground speed readouts blank. Maintenance controller deferred both items using incorrect reference.
| Attributes | |
| ACN | 713110 |
| Time | |
| Date | 200610 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Aircraft 1 | |
| Controlling Facilities | tower : san.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : parked |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician oversight : coordinator |
| Qualification | technician : powerplant technician : airframe |
| Experience | maintenance technician : 12 |
| ASRS Report | 713110 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | aircraft equipment problem : less severe maintenance problem : non compliance with mel non adherence : far non adherence : published procedure |
| Independent Detector | aircraft equipment other aircraft equipment : hsi dme and speed readouts blank other flight crewa other flight crewb |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other other |
| Factors | |
| Maintenance | contributing factor : schedule pressure performance deficiency : logbook entry performance deficiency : non compliance with legal requirements performance deficiency : fault isolation |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Maintenance Human Performance Aircraft Chart Or Publication Environmental Factor |
| Primary Problem | Maintenance Human Performance |
Narrative:
While talking with flight crew; they informed me of a problem with #2 HSI ground speed readout and mi readout being blank. In our conversation; crew made mention of backgnd lights control with rheostat working as he could see lights going dim bright. I was/am aware of separate MEL's for the 2 readouts but chose to use 33-1 to cover both based on my own confusion over the dimming issue. What captain really meant was the HSI backgnd lights were working. In retrospect; I should have used the 2 MEL option as it would have been a better option; and the 'correct' option. I had already realized my possible mistake by my shift's end and told my relief of my suspicions and to have it corrected when aircraft arrived at its current destination of ZZZ1. In ZZZ1; maintenance found a circuit breaker popped. Reset and both indications operations normal.
Original NASA ASRS Text
Title: A B737-300 HAD CAPT'S HSI DOME AND GND SPD READOUTS BLANK. MAINT CTLR DEFERRED BOTH ITEMS USING INCORRECT REF.
Narrative: WHILE TALKING WITH FLT CREW; THEY INFORMED ME OF A PROB WITH #2 HSI GND SPD READOUT AND MI READOUT BEING BLANK. IN OUR CONVERSATION; CREW MADE MENTION OF BACKGND LIGHTS CTL WITH RHEOSTAT WORKING AS HE COULD SEE LIGHTS GOING DIM BRIGHT. I WAS/AM AWARE OF SEPARATE MEL'S FOR THE 2 READOUTS BUT CHOSE TO USE 33-1 TO COVER BOTH BASED ON MY OWN CONFUSION OVER THE DIMMING ISSUE. WHAT CAPT REALLY MEANT WAS THE HSI BACKGND LIGHTS WERE WORKING. IN RETROSPECT; I SHOULD HAVE USED THE 2 MEL OPTION AS IT WOULD HAVE BEEN A BETTER OPTION; AND THE 'CORRECT' OPTION. I HAD ALREADY REALIZED MY POSSIBLE MISTAKE BY MY SHIFT'S END AND TOLD MY RELIEF OF MY SUSPICIONS AND TO HAVE IT CORRECTED WHEN ACFT ARRIVED AT ITS CURRENT DEST OF ZZZ1. IN ZZZ1; MAINT FOUND A CIRCUIT BREAKER POPPED. RESET AND BOTH INDICATIONS OPS NORMAL.
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.