# SDR HYIA20201116001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 12, 2020
- Submitted: November 16, 2020
- Operation: Air carrier
- Aircraft: [N991AA](https://openairdocs.org/aircraft/N991AA), registered now
- Make and model: Cessna 402C
- Registry model: [Cessna 402C](https://openairdocs.org/model/cessna-402c) (OpenAirDocs)
- Aircraft serial: 402C0317
- Aircraft time: 37,994 hours, 42,728 cycles
- System (JASC): [5410 · Nacelle/Pylon, Main Frame](https://openairdocs.org/jasc/5410)
- Part: Beam
- Part number: 56541097
- Condition: Cracked
- Location: Rt Engine
- Part time: 37,994 hours, 42,728 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/HYIA20201116001

## Discrepancy

DURING MAINTENANCE A CRACK WAS DISCOVERED ON THE INBOARD FACE OF THE RIGHT HAND INBOARD ENGINE BEAM IN THE AREA OF THE VERTICAL ATTACH CHANNELS FOR THE CROSSOVER BEAM.  THIS CRACK WAS DISCOVERED AFTER CHANGING THE CROSSOVER BEAM VERTICAL ATTACH BRACKET P/N: 5654107-15 AND THE ASSOCIATED 5654107-10 UPRIGHT.  THEREFORE, NOT VISIBLE UNTIL THE BRACKET WAS REMOVED.  THE CRACK MEASURES APPROXIMATELY .780 INCHES LONG, AND IS CONSISTENT WITH OTHERS FOUND IN THIS AREA USING A DETAILED VISUAL INSPECTION.  THIS BEAM HAS BEEN REPLACED USING NEW PARTS.

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