# SDR QXEA2010010700021

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 3, 2010
- Submitted: January 8, 2010
- Operation: Air carrier
- Aircraft: N401QX
- Make and model: Bombdr DHC8402
- Aircraft serial: 4031
- Aircraft time: 21,406 hours, 22,117 cycles
- System (JASC): [3150 · Central Warning](https://openairdocs.org/jasc/3150)
- Part: Warning Horn
- Condition: False Activation
- Stage of operation: TO
- How discovered: O
- Nature of condition: J
- Precautionary procedure: C
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/QXEA2010010700021

## Discrepancy

TAKEOFF WARNING HORN SONDED ON T/O ROLL FOR 3 SEC NO ABNORMAL SETTINGS OR INDICATIONS. PERFORMED GVI OF PARKBRAKE MICROSWITCH AFTER CLEAN AND LUBE W/ APPROVED PRODUCTS AND NO DEFECT NOTED.  C/W FUNCTIONAL TEST OF THE TAKEOFF WARNING SYS IAW AMM 31-51-00-720-801.  FUNCTIONAL CHECKS GOOD.  REPLACED FDR W/ NEW FROM STOCK IAW AMM 31-32-01-000/400-801 AND HS NR31-0003.  OPS CHECK OF FDR GOOD & FUNCTIONAL TEST OF ULB GOOD.  ACFT OK FOR SERVICE.  NOTE: FDR PN 980-4700-027 SN 12574 REMOVED IN SERVICEABLE CONDITION. RETURNED TO SERVICE.

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