# SDR ASAA2023060743502

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 7, 2023
- Submitted: June 9, 2023
- Operation: Air carrier
- Aircraft: [N956AK](https://openairdocs.org/aircraft/N956AK), registered now
- Make and model: Boeing 737-9
- Registry model: [Boeing 737-9](https://openairdocs.org/model/boeing-737-9) (OpenAirDocs)
- Aircraft serial: 43360
- Aircraft time: 1,425 hours, 408 cycles
- System (JASC): [3600 · Pneumatic System](https://openairdocs.org/jasc/3600)
- Part: Modulating Valve
- Part number: 632920704
- Part serial: 3203
- Condition: Out Of Range
- Location: #1 Engine
- Part time: 1,440 hours, 411 cycles
- Stage of operation: IN
- How discovered: V
- Nature of condition: J
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2023060743502

## Discrepancy

WHILE ACCOMPLISHING ASA T/C 31-005-00 FOUND SMT MESSAGE BLEED FAMV RVDT L SIGNAL IS OUT OF RANGE MAINTENANCE MESSAGE 36-12030. GROUNDED - YES. ACCOMPLISHED B737-9 IFIM TASK 36-12-00-810-803, ELECTRICAL LRU - REPLACEMENT TEST WHICH PASSED. DUE TO HISTORY AND MULTIPLE LEG FAULTS REPLACED THE FAN AIR MODULATING VALVE REF B737-9 AMM 36-12-03. PERFORMED OPS TEST. NO FAULTS.

---
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.