# SDR 200200263

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 10, 2002
- Submitted: May 10, 2002
- Operation: Air carrier
- Filed by: [Marana Aerospace Solutions Inc, repair station ERKR675D](https://openairdocs.org/faa-repair-station/ERKR675D/marana-aerospace-solutions-inc.md) (OpenAirDocs)
- Aircraft: N470EV
- Make and model: Boeing 747273C
- Aircraft serial: 20653
- Aircraft time: 84,303 hours, 18,910 cycles
- System (JASC): [5753 · Trailing Edge Flaps](https://openairdocs.org/jasc/5753)
- Part: Flap Track
- Part number: 65B170641
- Condition: Damaged
- Location: T/E Flap
- 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/200200263

## Discrepancy

CORROSION AND THREAD DAMAGE WERE FOUND COMMON TO FORWARD BOLT HOLE LOCATIONS (4 EA INBOARD AND OUTBOARD SIDES) OF NR 4 TRAILING EDGE FLAP TRACK.  THREAD DAMAGE WAS COMMON TO THE FAIL-SAFE BAR OUTBOARD HOLE NR 3.  THE CORROSION AND THREAD DAMAGE WERE REMOVED AND THE BOLT HOLES WERE REWORKED PER BOEING SERVICE BULLETIN 747-57-2256 AND EIA ECRA 470-57-125-2.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.