ASN Wikibase Occurrence # 309974
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: | Sunday 21 September 2014 |
| Time: | 13:05 LT |
| Type: |  Boeing 747-451 |
| Owner/operator: | Delta Air Lines |
| Registration: | N669US |
| MSN: | 24224/803 |
| Year of manufacture: | 1990 |
| Total airframe hrs: | 103501 hours |
| Engine model: | P&W PW4056 |
| Fatalities: | Fatalities: 0 / Occupants: 333 |
| Aircraft damage: | None |
| Category: | Serious incident |
| Location: | near Atlanta Hartsfield-Jackson International Airport, GA (ATL/KATL) -
 United States of America
|
| Phase: | Initial climb |
| Nature: | Passenger - Scheduled |
| Departure airport: | Atlanta Hartsfield-Jackson International Airport, GA (ATL/KATL) |
| Tokyo-Narita Airport (NRT/RJAA) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
Delta Air Lines flight DL295, a Boeing 747-451 airplane, experienced a loss of power that was followed by an in-flight undercowl fire in the No. 4 engine, a Pratt & Whitney (P&W) PW4056 turbofan, shortly after takeoff from Atlanta Hartsfield-Jackson International Airport, GA (ATL). The airplane was making a maximum power takeoff from runway 27 Right.
The pilots reported that the engine's operation was normal during the takeoff roll until just after liftoff. At about 400 feet above ground level (AGL), the pilots heard a loud bang, the airplane yawed, and they noted that the No. 4 engine's cockpit instruments indicated a loss of power. The pilot's accomplished the quick reference handbook (QRH) engine failure checklist and shutdown the No. 4 engine. At about 1,300 feet AGL, the No. 4 engine fire warning activated. The pilot's accomplished the QRH engine fire checklist and discharged the A fire bottle into the No. 4 engine's nacelle. When the fire warning did not go out after a minute, the pilots discharged the B fire bottle into the engine's nacelle. The fire warning extinguished about 20 seconds after the B fire bottle was discharged. The pilots dumped 280,000 pounds of fuel and returned to ATL for a three-engine landing on Runway 27 Right without further incident. The pilots stopped the airplane on the runway and after the fire department determined the engine was safe, they taxiied the airplane back to the gate.
Probable Cause and Findings
Turbine Overhaul Service's aggressive grit blasting and incomplete masking of the blade root neck that allowed the no grit blast area being exposed during the overhaul of the blade resulting in blasting media being embedded in the blade root from which a fatigue crack developed. The fatigue crack propagated until separation of the blade occurred that resulted in a complete loss of engine power. The fire was caused by the B-nut on the hydraulic line from the fuel pump and pulsation damper loosening from engine vibration after the compressor blade separated spraying high pressure fluid into the engine compartment that ignited on the hot engine cases.
Accident investigation:
 |
|
Sources:
NTSB ENG14IA027
History of this aircraft
Other occurrences involving this aircraft
| 17 June 2011 | N669US | Delta Airlines | 0 | Midway Atoll |  |
min |
| Windscreen cracks or failure | ||||||
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 01-Apr-2023 13:49 | 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