# SDR ASAA2017032620271

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 26, 2017
- Submitted: March 28, 2017
- Operation: Air carrier
- Aircraft: [N471AS](https://openairdocs.org/aircraft/N471AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41703
- Aircraft time: 9,835 hours, 3,270 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Filter
- Part number: 412A160041
- Condition: Contaminated
- Location: Cabin
- Stage of operation: NR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2017032620271

## Discrepancy

FWD CAB ZONE TEMP LIGHT ILLUMINATED ON MASTER CAUTION RECALL. EXTINGUISHED WHEN PUSH TO RESET. GROUNDED - YES. ACCOMPLISHED NR 2 PZ CONTROLLER BITE, REF AMM 21-61-00. FOUND FWD CABIN ZONE TEMP LIGHT "ON". CONTROLLER SHOWED ZONE TRIM VALVE FAULT LIGHT ON. AFTER CLEANING FWD CABIN FAN FILTER PERFORMED BITE AGAIN. NO FAULTS LOGGED - ALL CLEARED. ACCOMPLISHED RIGHT PACK OPS TEST, REF AMM 21-00-00. SYSTEM CHECKS NORMAL.

---
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.