# SDR ASAA2012070492468

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 4, 2012
- Submitted: July 6, 2012
- Operation: Air carrier
- Aircraft: [N508AS](https://openairdocs.org/aircraft/N508AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35691
- Aircraft time: 15,109 hours, 4,810 cycles
- Engine: Cfmint CFM567B273
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Regulator
- Part number: 1074926
- Part serial: 3005CC
- Condition: Failed
- Location: Nr 1 Engine
- Part time: 58,830 hours, 32,533 cycles
- Stage of operation: IN
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2012070492468

## Discrepancy

WITH ENGINES RUNNING, NR 1 BLEED AIR DOES NOT SHUT OFF WHEN NR 1 BLEED SWITCH SELECTED TO OFF.  ACFT GROUNDED.  ALTERNATE DEACTIVATION PROCEDURES USED IAW CH 5, TABLE 3, ITEM 1, 3, 4.   REPLACED THE NR 1 ENGINE BLEED AIR REGULATOR IAW MM 36-11-03.  OPS CK GOOD.  ALTERNATE DEACTIVATION PROCEDURES REVERSED.  BLEED AIR FUNCTIONED NORMALLY DURING ENGINE RUN.

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