# SDR ASAA2012090592844

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 6, 2012
- Submitted: September 11, 2012
- Operation: Air carrier
- Aircraft: [N506AS](https://openairdocs.org/aircraft/N506AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35690
- Aircraft time: 16,263 hours, 5,205 cycles
- Engine: Cfmint CFM567B273
- System (JASC): [3830 · Waste Disposal System](https://openairdocs.org/jasc/3830)
- Part: Tank
- Condition: Obstructed
- Location: Lavatory
- Part time: 16,263 hours, 5,205 cycles
- Stage of operation: CL
- How discovered: O
- Nature of condition: C
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2012090592844

## Discrepancy

ALL LAVATORIES INOPERATIVE.  PERFORMED TROUBLESHOOTING.   R & R CONT LEVEL SENSOR IAW AMM 38-30-00-810-809 & 38-33-02-400-801.  WHEN SENSOR REMOVED FOUND LAVATORY TANK PLUGGED WITH CLOTH TOWELS.  REMOVED ALL BLOCKAGE FROM DRAIN VALVE. DRAINED , FILLED, CLEANED & REFILLED LAV WASTE TANK. ALL LAV FUNCTIONAL TEST OK.  WASTE QTY IND STILL INDICATES FULL.  CLEANED BOTH POINT LVL SENSORS IAW AMM 38-33-01-100-801.  FULL LIGHT NO OUT, TANK SHOWS EMPTY, ALL LAV OPS CK OK.  PERFORMED AUTO ZERO TEST IAW AMM 38-33-00-710-801. ALL LAVS NOW TEST OK. ACFT OK FOR SERVICE.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.