# SDR AU000596

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 27, 2000
- Submitted: August 4, 2000
- Operation: General aviation
- Make and model: Boeing 737377
- Engine: Ge CFM563B1
- System (JASC): [7830 · Engine Thrust Reverser](https://openairdocs.org/jasc/7830)
- Part: Nut
- Part number: 000518ANSSN30
- Condition: Undertorqued
- Location: Thrust Reverser
- Part time: 31,130 cycles
- Stage of operation: IN
- How discovered: V
- Nature of condition: W
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AU000596

## Discrepancy

(AUS) DURING PREFLIGHT INSPECTION, THE NR 4 BLOCKER DOOR WAS FOUND NOT FULLY STOWED ON THE NR 1 ENGINE I/B REVERSER COWL. INVESTIGATION THEN FOUND THE BLOCKER DOORS LOWER HINGE BOLT WAS MISSING ANDTHE UPPER BOLT WAS LOOSE.  FURTHER INVESTIGATION FOUNDTHE NR 2  AND NR 3 BLOCKER DOORS HAD LOOSE NUTS ON THE LOWER HINGE BOLTS AND MISSING NUTS AND WASHERS ON THE UPPER HINGE BOLTS. SUSPECT THE  FASTENERS WERE IMPROPERLY TORQUED AT LAST BLOCKER DOOR REPLACEMENT. MAINTENANCE/PERSONNEL ERROR.

---
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.