ASN Wikibase Occurrence # 378201
This information is added by users of ASN. Neither ASN nor the Flight Safety Foundation are responsible for the completeness or correctness of this information.
If you feel this information is incomplete or incorrect, you can submit corrected information.
| Date: | Saturday 27 October 1984 |
| Time: | 13:18 LT |
| Type: |  McDonnell Douglas DC-10-30 |
| Owner/operator: | United Airlines |
| Registration: | N1852U |
| MSN: | 47811/302 |
| Engine model: | GE CF6-50C2B |
| Fatalities: | Fatalities: 0 / Occupants: 276 |
| Aircraft damage: | Minor |
| Category: | Serious incident |
| Location: | Chicago, IL -
 United States of America
|
| Phase: | En route |
| Nature: | Passenger - Scheduled |
| Departure airport: | |
| Honolulu-Daniel K. Inouye International Airport, HI (HNL/PHNL) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
SHORTLY AFTER TAKEOFF, THE FLIGHT CREW HEARD A NOISE FROM THE RIGHT SIDE OF THE AIRCRAFT, WHICH SOUNDED LIKE AN ENGINE COMPRESSOR STALL. THE #3 ENGINE WAS SHUT DOWN & THE CREW MADE AN UNEVENTFUL LANDING AT THE DEPARTURE AIRPORT. PIECES OF COWLING FROM THE RIGHT ENGINE FELL IN A RESIDENTIAL AREA, BUT DID NO DAMAGE. TEARDOWN OF THE ENGINE REVEALED THAT TURBINE BLADES ON THE FIRST STAGE LOW PRESSURE TURBINE WHEEL HAD BROKEN OFF & HAD PENETRATED THE ENGINE CASE & CORE COWL DOORS. FURTHER INVESTIGATION REVEALED THAT 2 STUD BOLTS (SADDLE BOLTS) HAD PULLED OUT FROM STRUT BOSSES 2 & 3 IN THE TURBINE MID FRAME (TMF), WHICH PLACED AN ADDITIONAL LOAD ON STRUT BOSSES 1 & 4. EVENTUALLY, THE 1 & 4 SADDLE BOLTS PULLED LOOSE & ALLOWED THE NOZZLE SUPPORT FLANGE TO SHIFT REARWARD. THIS SHIFT ALLOWED THE NOZZLE SEGMENTS TO COME IN CONTACT WITH THE LOW PRESSURE TURBINE & RESULT IN THE FAILURE. THERE WAS INDICATION THAT UNAUTHORIZED REWORK HAD BEEN ACOMPLISHED ON THE SADDLE BOLTS BEFORE OWNER (UNITED AIRLINE) HAD PURCHASED THE AIRPLANE FROM ANOTHER (LAKER) AIRLINE.
Probable Cause:
Accident investigation:
 |
|
Sources:
NTSB CHI85IA032
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 31-Mar-2024 06:01 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
The Aviation Safety Network is an exclusive service provided by:
Quick Links:
| ASN Home | Send Correction / Feedback |
| FSF Home | Disclaimer | Copyright |
| Contact Us | Privacy Policy |
| Press / Media |
CONNECT WITH US:
©2024 Flight Safety Foundation