# SDR BTVR950621

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 21, 1995
- Submitted: March 26, 2000
- Operation: General aviation
- Filed by: [Pentastar Aviation, LLC., repair station BTVR626C](https://openairdocs.org/faa-repair-station/BTVR626C/pentastar-aviation-llc.md) (OpenAirDocs)
- Aircraft: N1901M
- Make and model: Gulstm GIV
- Aircraft serial: 1039
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Duct
- Part number: 1159P419813
- Condition: Chafed
- Location: Lt Pylon
- Part time: 3,631 hours
- Stage of operation: IN
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/BTVR950621

## Discrepancy

DURING A NON-ROUTINE, UNSCHEDULED REMOVAL OF THE LEFT ENGINE THRUST STRUT, THE L.P. AIR DUCT MENTIONED WAS REMOVED.  AFTER REMOVAL, A HOLE WAS DISCOVERED IN THE DUCT CHAFED BY THE AFT THRUST STRUT ATTACH BOLT HEAD (PN GAB511EB14D40).  THIS DEFECT WAS IN SUCH A LOCATION THAT A STANDARD VISUAL INSPECTION WOULD NOT HAVE DISCOVERED THE DEFECT.  (X)

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