# SDR B72R20200270182

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 18, 2020
- Submitted: February 27, 2020
- Operation: General aviation
- Aircraft: [N894BA](https://openairdocs.org/aircraft/N894BA), registered now
- Make and model: Boeing 747-8
- Registry model: [Boeing 747-8](https://openairdocs.org/model/boeing-747-8) (OpenAirDocs)
- Aircraft serial: 42416
- System (JASC): [5313 · Fuselage Main, Longeron/Stringer](https://openairdocs.org/jasc/5313)
- Part: Stringer Splice
- Part number: 146U7713319
- Condition: Cracked
- Location: Bs 1960
- Stage of operation: IN
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/B72R20200270182

## Discrepancy

AFTER REMOVAL OF INSULATION BLANKETS IN PREPARATION FOR AIRFRAME MAJOR ALTERATION OF AIRCRAFT COMPLETION CENTER, A CRACK 1.80 LONG WAS DISCOVERED AT STATION 1960 STRINGER SPLICE ON STRINGER S-10L.  FURTHER INSPECTION OF OTHER STRINGERS DETECTED CRACKS IN MULTIPLE STRINGERS AT MULTIPLE STATIONS.  THUS FAR, CRACKS HAVE BEEN IDENTIFIED IN THE FOLLOWING AREAS:  S-11L, S-10L, S-5R, S-6R, S-7R, S-12R.  ADDITIONAL CRACKS HAVE BEEN IDENTIFIED VISUALLY, BUT HAVE NOT YET BEEN FULLY DOCUMENTED.  VERIFICATION VIA NONDESTRUCTIVE TESTING IS BEING CONDUCTED ON STRINGERS AT THE FOLLOWING STATIONS:  740, 1000, 1241, 1283, 1350, 1480, 1740, 1960, AND 2180.  NOTE:  THE INFORMATION IS ALSO BEING REPORTED BY THE BOEING COMPANY VIA THE CONTINUED OPERATIONAL SAFETY PROGRAM(COSP).  REFER TO BOEING COSP REPORT #2020-0261.  (THIS REPORT SUBMITTED BY 145 REPAIR STATION B72R2480, BOEING AEROSPACE OPERATIONS INC.  375 AIRLIFT DRIVE SECOND FLOOR/C-43 SAN ANTONIO, TX  78226-1604.) CAUSE HAS NOT YET BEEN DETERMINED.  LAB TESTING WILL BE ACCOMPLISHED AND REPORTED TO COSP REPORT #2020-0261.  REFER TO BOEING AEROSPACE OPERATION, INC.  NONCONFORMANCE REPORT (NCR) NUMBER NCR1017665N.

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