# SDR 2007FA0000836

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 6, 2007
- Submitted: September 26, 2007
- Operation: General aviation
- Aircraft: N621RB
- Make and model: Lear 35A
- Registry model: [Lear 35A](https://openairdocs.org/model/gates-learjet-35a) (OpenAirDocs)
- Aircraft serial: 211
- Engine: Garrtt TFE731*
- System (JASC): [3411 · Pitot/Static System](https://openairdocs.org/jasc/3411)
- Part: Static System
- Condition: Misinstalled
- Stage of operation: NR
- How discovered: 9
- Nature of condition: W
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2007FA0000836

## Discrepancy

THIS RVSM AIRCRAFT HAD AN ALTIMETRY SYSTEM SPLIT.  CONTACTED STC GROUP HOLDER FOR PROPER ROUTING OF STATIC SYSTEM PLUMBING.  FOUND CO-PILOTS SYSTEM WAS NOT CROSS COUPLED WITH PILOTS SYSTEM.  INSTALLED FABRICATED HOSES TO THE CO-PILOTS SYSTEM TO MEET STC NR ST 00563DE-D.  PROBABLE CAUSE: CO-PILOTS STATIC SYS NOT CROSS-COUPLED AT STC INSTALLATION OR SYSTEM WAS MODIFIED/ ALTERED POST-STC WITHOUT APPROVED DATA.  (K)

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