# SDR 2026FA0000299

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 27, 2026
- Submitted: April 27, 2026
- Operation: General aviation
- Aircraft: N485SH
- Make and model: Agusta AW139
- Registry model: [Agusta AW139](https://openairdocs.org/model/agustawestland-philadelphia-aw139) (OpenAirDocs)
- Aircraft serial: 41363
- Aircraft time: 8,061 hours, 18,940 cycles
- Engine: Pwc PT6C67C
- System (JASC): [5302 · Rotorcraft Tail Boom](https://openairdocs.org/jasc/5302)
- Part: Tail Boom
- Part number: 3G5350A00136D
- Part serial: PZL240C
- Condition: Corroded
- Location: Zone 300
- Part time: 3,465 hours, 8,963 cycles
- Stage of operation: TX
- How discovered: V
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2026FA0000299

## Discrepancy

DURING THE PERFORMANCE OF THE GENERAL VISUAL INSPECTION AS SPECIFIED IN THE CONDITIONS OF PSE/TQ/2025/215289 REPAIR DEFERRAL LETTER, EVIDENCE OF PROPAGATION AND WORSENING CONDITIONS WAS DETERMINED OF THE CORROSION AT STA 8700, BL0.0 LOWER STRUCTURE OF 9Y-ELL TAIL BOOM.  EXFOLIATING CORROSION WAS FIRST OBSERVED ON THE FORWARD PART OF THE TAIL BOOM ASSEMBLY AT STA 8700, BL0.0 AND WL 1560. THIS DISCOVERY WAS COMMUNICATED TO THE OEM REFERENCE PSE/TQ/2025/202222. A PROVISIONAL GENERAL VISUAL INSPECTION CONDITION FOR ANY PROPAGATION OR WORSENING CONDITION IS TO BE ASSESSED. ONCE THE DAMAGE ASSESSMENT IS SATISFACTORY THE AIRCRAFT IS ALLOWED TO CONTINUE OPERATIONS. REFERENCE PSE/TQ/2025/202222, PSE/TQ/2025/203510 AND PSE/TQ/2025/215289 WERE ISSUED BY THE OEM GIVING PERMISSION TO OPERATE UNTIL A SPECIFIC TIME UNDER GVI CONDITIONS. OEM HAS BEEN INFORMED OF THE PREVAILING/ WORSENING CONDITIONS DISCOVERED RECENTLY.  BCL WILL REMOVE THE TAIL BOOM (S/N: PZL240C) AND CARRY OUT FURTHER DAMAGE ASSESSMENTS AS PER IETP INSTRUCTIONS.

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