# SDR Z5FA121310N431CS1

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 13, 2010
- Submitted: December 23, 2010
- Operation: Air carrier
- Aircraft: N431CS
- Make and model: Cessna 525B
- Registry model: [Cessna 525B](https://openairdocs.org/model/cessna-525b) (OpenAirDocs)
- Aircraft serial: 525B0228
- Aircraft time: 2,557 hours, 1,881 cycles
- System (JASC): [3260 · Landing Gear Position and Warning](https://openairdocs.org/jasc/3260)
- Part: Bulb
- Part number: 327
- Condition: Burned Out
- Location: Mlg Indicator
- Stage of operation: AP
- How discovered: O
- Nature of condition: P
- Precautionary procedure: L
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/Z5FA121310N431CS1

## Discrepancy

ON APPROACH, EXTENDED MLG AND LT MLG LIGHT FAILED TO ILLUMINATE GREEN. ABORTED APPROACH. ON COMPLETION OF CHECKLIST.  INCLUDING BLOWING THE NITROGEN BOTTLE, ROTARY TEST & FAILURE OF LIGHT TO ILLUMINATE, DECLARED AN EMERGENCY.  AFTER SUCCESSFULLY COMPLETING MLG WARNING HORN TEST CONFIRMING A BAD BULB.  ACFT LANDED WITHOUT INCIDENT.  MAINTENANCE REPLACED BULB IN DOWN INDICATOR.  SATISFACTORY GEAR SWING WAS PERFORMED, ACFT FLEW SUCCESSFUL OPS CHECK FLT AND WAS RETURNED TO SERVICE.

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