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During a pre-departure walk-around; a first officer (first officer) notices two different light bulbs would illuminate on opposite wing tips when the A320 navigation light switch was moved to either the # 1 or # 2 position. When in position #2; the right wing tip outboard aft nav light was illuminated correctly; but on the left wing the inboard forward bulb was illuminated.
| Attributes | |
| ACN | 1242468 |
| Time | |
| Date | 201502 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | A320 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Navigation Light |
| Person 1 | |
| Function | First Officer |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 150 Flight Crew Total 10000 Flight Crew Type 6000 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Maintenance Deviation - Procedural Published Material / Policy |
Narrative:
I did the walk-around prior to our flight. The navigation light switch was in the # 2 position which I've always known to illuminate the aft (outboard) nav lights on the wing tips. The right wing tip was illuminated correctly but the left wing tip light was illuminated in the # 1 position (forward and inboard). When we switched it to the # 1 position then it illuminated the aft and outboard bulb. This seemed backwards from normal so we wrote up the discrepancy and after an hour of research maintenance said it was normal. We both explained that we had never seen it before but they said that was how it was supposed to work according to their wiring diagram. So either we are being taught incorrectly and our FM is vague or the maintenance document is incorrect. But I have never seen two different bulbs illuminated on opposite wing tips with a given switch position.
Original NASA ASRS Text
Title: During a pre-departure walk-around; a First Officer (FO) notices two different light bulbs would illuminate on opposite wing tips when the A320 Navigation light switch was moved to either the # 1 or # 2 position. When in position #2; the right wing tip outboard aft Nav light was illuminated correctly; but on the left wing the inboard forward bulb was illuminated.
Narrative: I did the walk-around prior to our flight. The navigation light switch was in the # 2 position which I've always known to illuminate the aft (outboard) Nav lights on the wing tips. The right wing tip was illuminated correctly but the left wing tip light was illuminated in the # 1 position (forward and inboard). When we switched it to the # 1 position then it illuminated the aft and outboard bulb. This seemed backwards from normal so we wrote up the discrepancy and after an hour of research maintenance said it was normal. We both explained that we had never seen it before but they said that was how it was supposed to work according to their wiring diagram. So either we are being taught incorrectly and our FM is vague or the maintenance document is incorrect. But I have never seen two different bulbs illuminated on opposite wing tips with a given switch position.
Data retrieved from NASA's ASRS site 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.