# SDR C77A20130828001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 28, 2013
- Submitted: August 28, 2013
- Operation: Air carrier
- Aircraft: N612CZ
- Make and model: Emb ERJ 170-200 LR
- Registry model: [EMB ERJ 170-200 LR](https://openairdocs.org/model/embraer-s-a-erj-170-200-lr) (OpenAirDocs)
- Aircraft serial: 17000201
- Aircraft time: 15,603 hours, 8,957 cycles
- System (JASC): [5711 · Wing Spar](https://openairdocs.org/jasc/5711)
- Part: Spar
- Condition: Cracked
- Location: Zone 500
- Part time: 15,603 hours, 8,957 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/C77A20130828001

## Discrepancy

TWO CRACKS IN LT STUB WING SPAR III ,CRACK INDICATIONS AT THE 3 & 7 O`CLOCK, CRACKS START AT THE FWD SURFACE OF THE BLKHD EXTEND 0.125" INTO THE BORE WITH AN AMPLITUDE OF 100 PERCENT AND 60 PERCENT.  PHASE ANGLE= 311, DEGREES  L=0.300") WERE FOUND IN THE CRITICAL FASTENER HOLE ON THE LT SIDE AFTER IT HAD BEEN ENLARGED TO 8MM (.314") DIAMETER IAW THE SB170-57-0038.  SINCE THE REPAIR OF A CRACKED HOLE IS NOT COVERED IN THE SB, A REPAIR WAS REQUESTED FROM MFG.  THE CRACK DAMAGE WAS REMOVED BY SPOT FACING TO .625" AND INSTALLING AN OVERSIZED BUSHING IAW ETD2013-170-030355A.

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