# SDR AMCR20180620002

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 19, 2018
- Submitted: June 20, 2018
- Operation: General aviation
- Filed by: [Alticor Inc, repair station AMCR163C](https://openairdocs.org/faa-repair-station/AMCR163C/alticor-inc.md) (OpenAirDocs)
- Aircraft: N279DV
- Make and model: Cessna 525C
- Registry model: [Cessna 525C](https://openairdocs.org/model/cessna-525c) (OpenAirDocs)
- Aircraft serial: 525C0052
- Aircraft time: 2,325 hours, 1,914 cycles
- System (JASC): [3510 · Crew Oxygen System](https://openairdocs.org/jasc/3510)
- Part: Tee Fitting
- Part number: AS4857D01
- Condition: Cracked
- Location: Zone 100
- Part time: 2,325 hours, 1,914 cycles
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AMCR20180620002

## Discrepancy

MAINTENANCE, SUSPECTING A LEAK IN THE O2 SYSTEM, OBSERVED MORE-THAN-USUAL O2 LOSS OVERNIGHT. SUBSEQUENT INVESTIGATION FOUND THREE CRACKS IN THE ALUMINUM T-FITTING NEAR THE BOTTLE, WHICH CONNECTS THE O2 TO THE PRESSURE GAUGE AND THE TRANSDUCER. IT APPEARS THE FITTINGS WERE OVER-TORQUED WHICH SPLIT ALL THREE ENDS ON THE T-FITTING.

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