# SDR UIEA2011080100433

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 1, 2011
- Submitted: August 10, 2011
- Operation: Air carrier
- Aircraft: N524MC
- Make and model: Boeing 747-2D7B
- Registry model: [Boeing 747-2D7B](https://openairdocs.org/model/boeing-747-2d7b) (OpenAirDocs)
- Aircraft serial: 21784
- Aircraft time: 105,635 hours, 21,872 cycles
- System (JASC): [5312 · Fuselage Main, Bulkhead](https://openairdocs.org/jasc/5312)
- Part: Pressure Panel
- Condition: Cracked
- Location: Bs 1241
- 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/UIEA2011080100433

## Discrepancy

DURING THE PRESENT C4/A6 CHECK, INSPECTION ON THE DATUM ACFT REVEALED CRACKS ON BOTH BS1240 PRESSURE DECK CLOSEOUT PANELS AS SHOWN IN FIGURE 1:- LT SIDE (LBL 75.92 TO 98.58): CRACK WAS REPORTED AT 3" LONG, ALL DATA WAS RECORDED IN NRC 512291.  REPAIRED BOTH PANELS USING SB 747-53-2329R2, FIG 6. THESE TYPE OF REPAIRS ARE TIME LIMITED AND SUBJECT TO SUBSEQUENT INSP EVERY 1,000 FH AND REPLACEMENT NO LATER THAN 18 MONTHS AFTER THE REPAIR INSTALLATION.

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