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A B737-300 during a takeoff warning test switch replacement the brake pressure indicator and #2 oil pressure indicator cannon plugs were disconnected. On close-up inspection; the cannon plugs were inadvertently swapped.
| Attributes | |
| ACN | 672772 |
| Time | |
| Date | 200509 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Environment | |
| Flight Conditions | Mixed |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : powerplant technician : airframe |
| Experience | maintenance technician : 23 |
| ASRS Report | 672772 |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper documentation maintenance problem : improper maintenance maintenance problem : non compliance with mel non adherence : published procedure non adherence : far |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other |
| Factors | |
| Maintenance | contributing factor : schedule pressure performance deficiency : installation performance deficiency : testing performance deficiency : repair performance deficiency : non compliance with legal requirements performance deficiency : inspection |
| Supplementary | |
| Problem Areas | Aircraft Chart Or Publication Maintenance Human Performance |
| Primary Problem | Maintenance Human Performance |
Narrative:
Sep/wed/05 before shift change; aircraft X returned to gate for takeoff warning. (Takeoff warning switch failed.) to gain more access for takeoff warning test switch; I disconnected flight deck hydraulic brake pressure indicator cannon plug and #2 oil pressure gauge cannon plug. After takeoff warning switch replacement; I reconnected cannon plugs. Circuit breaker for hydraulic brake pressure indicator tripped. Placed brake pressure indicator on MEL. Sep/thu/05 on overnight; found out that cannon plugs were swapped; mechanic on overnight reconnected and cleared MEL.
Original NASA ASRS Text
Title: A B737-300 DURING A TKOF WARNING TEST SWITCH REPLACEMENT THE BRAKE PRESSURE INDICATOR AND #2 OIL PRESSURE INDICATOR CANNON PLUGS WERE DISCONNECTED. ON CLOSE-UP INSPECTION; THE CANNON PLUGS WERE INADVERTENTLY SWAPPED.
Narrative: SEP/WED/05 BEFORE SHIFT CHANGE; ACFT X RETURNED TO GATE FOR TKOF WARNING. (TKOF WARNING SWITCH FAILED.) TO GAIN MORE ACCESS FOR TKOF WARNING TEST SWITCH; I DISCONNECTED FLT DECK HYD BRAKE PRESSURE INDICATOR CANNON PLUG AND #2 OIL PRESSURE GAUGE CANNON PLUG. AFTER TKOF WARNING SWITCH REPLACEMENT; I RECONNECTED CANNON PLUGS. CIRCUIT BREAKER FOR HYD BRAKE PRESSURE INDICATOR TRIPPED. PLACED BRAKE PRESSURE INDICATOR ON MEL. SEP/THU/05 ON OVERNIGHT; FOUND OUT THAT CANNON PLUGS WERE SWAPPED; MECH ON OVERNIGHT RECONNECTED AND CLRED MEL.
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.