Individually Owned: 150,657
Corporate Owned: 137,281
Palm Springs Regional Airport
Aircraft Accident/Incident Report
Palm Springs, California 92262
Sunday, May 10, 1998 12:20 PDT
NTSB Narrative Summary Released at Completion of Accident
An uncontained engine failure occurred during the takeoff roll. The high pressure centrifugal impeller disk had burst, with one chunk exiting through the engine cowling. The melt and forging records for the disk were reviewed and met the required specifications, including alloy chemistry. Metallurgical examination of the disk revealed subsurface primary and secondary fatigue cracks near an area that had been reworked to remove LCF stresses in accordance with a Service Bulletin. The cracks were located opposite of each other in the seal relief undercut area. The primary fatigue origin was below the shot-peened surface near a high stress area and the secondary fatigue origin remained subsurface, with the propagation of both cracks running parallel to the surface until overload separation. The primary fracture surface could not be definitively analyzed due to plasticity and the presence of an oxide layer. No melt, forging-related or heat-treating defects were found in the vicinity of the fatigue origins; however, subsurface LCF was present. No significant hardness difference was found either in or away from the fatigue origins. There was no evidence of a subsurface occlusion. A physical resemblance between the fatigue origin and the zones of crystallographically aligned phase (texture zones) was observed in the microstructure. The shape and orientation of the origin macrostructure and/or texture may have been a contributing factor to crack initiation; however, no precipitating event or cause for the fatigue initiation was identified. Analysis reverified the Service Bulletin rework specifications, confirming that residual stress was negligible at the depth of crack initiation.
NTSB Probable Cause Narrative
the fatigue failure and uncontained separation of the high pressure impeller in the No. 2 engine during the takeoff roll. While the impeller showed evidence of a subsurface fatigue origin, the percipient cause of the separation was not definitively determined.
Event Information
| Type of Event | Incident |
| Event Date | 5/10/1998 |
| Event Day of the Week | Sunday |
| Time of Event | 1220 |
| Event Time Zone | Pacific Daylight Time |
| Event City | PALM SPRINGS |
| Event State | CALIFORNIA |
| Event Country | -- |
| Zipcode of the event site | 92262 |
| Event Date Year | 1998 |
| Event Date Month | 5 |
| MidAir Collision Indicator | No |
| On Ground Collision occurred ? | No |
| Event Location Latitude | |
| Event Location Longitude | |
| Event Location Airport | PALM SPRINGS REGIONAL |
| Event Location Nearest Airport ID | PSP |
| Indicates whether the acc/inc occurred off or on an airport | On Airport |
| Distance from airport in statute miles | -- |
| Degrees magnetic from airport | -- |
| Airport Elevation | 462 |
| Weather Briefing Completeness | Not pertinent |
| Investigator's weather source | Weather Observation Facility |
| Time of the weather observation | 1153 Pacific Daylight Time |
| Direction of event from weather observation facility (degrees) | 0 |
| Weather Observation Facility ID | PSP |
| Elevation of weather observation facility | 462 |
| Distance of event from weather observation facility (units?) | 0 |
| Time Zone of the weather observation | PDT |
| Lighting Conditions | Day |
| Lowest Ceiling Height | 0 |
| Lowest Non-Ceiling Height | 0 |
| Sky/Lowest/Cloud Conditions | Clear |
| Sky Condition for Lowest Ceiling | None |
| Visibility Runway Visual Range (Feet) | 0 |
| Visibility Runway Visual Value (Statute Miles) | 0 |
| Visibility (Statute Miles) | 10 |
| Air Temperature at event time (in degrees celsius) | 23 |
| Dew Point at event time (in degress fahrenheit) | 6 |
| Wind Direction (degrees magnetic) | 320 |
| Variable Wind Indicator | Unknown |
| Wind Speed (knots) | 13 |
| Wind Velocity Indicator | Unknown |
| Wind Gust Indicator | Unknown |
| Wind Gust (knots) | 20 |
| Altimeter Setting at event time (in. Hg) | 29 |
| Density Altitude (feet) | -- |
| Intensity of Precipitation | Unknown |
| METAR weather report | -- |
| Event Highest Injury | None |
| On Ground, Fatal Injuries | 0 |
| On Ground, Minor Injuries | 0 |
| On Ground, Serious Injuries | 0 |
| Injury Total Fatal | -- |
| Injury Total Minor | -- |
| Injury Total None | 8 |
| Injury Total Serious | -- |
| Injury Total All | -- |
| Investigating Agency | NTSB |
| NTSB Docket Number (internal use) | 5031 |
| NTSB Notification Source | -- |
| NTSB Notification Date | May 10 1998 12:00AM |
| NTSB Notification Time | 1235 |
| Fiche Number and/or location -used to find docket information | IMAGE |
| Date of most recent change to record | Dec 11 2000 11:21AM |
| User who most recently changed record | dbo |
| Basic weather conditions | Visual Meteorological Cond |
| FAA District Office | -- |
Aircraft Involved |
|
|---|---|
Aircraft #1 |
|
| Aircraft Registration Number | N651MK |
| NTSB Number | LAX98IA158 |
| Missing Aircraft Indicator | N |
| Federal Aviation Reg. Part | Part 91: General Aviation |
| Type of Flight Plan filed | IFR |
| Flight plan Was Activated? | -- |
| Damage | Minor |
| Aircraft Fire | None |
| Aircraft Explosion | None |
| Aircraft Manufacturer's Full Name | North American |
| Aircraft Model | NA265-65 |
| Aircraft Series Identifier | NA265-65 |
| Aircraft Serial Number | 465-73 |
| Certified Max Gross Weight | 24000 |
| Aircraft Category | Airplane |
| Aircraft Registration Class | U.S. Registered/U.S. Soil |
| Aircraft is a homebuilt? | No |
| Flight Crew Seats | -- |
| Cabin Crew Seats | -- |
| Passenger Seats | -- |
| Total number of seats on the aircraft | 10 |
| Number of Engines | 2 |
| Fixed gear or retractable gear | Retractable |
| Aircraft, Type of Last Inspection | Continuous Airworthiness |
| Date of Last Inspection | Mar 29 1998 12:00AM |
| Airframe hours since last inspection | 68 |
| Airframe Hours | 7183 |
| ELT Installed | No |
| ELT Activated | Unknown |
| ELT Aided Location of Event Site | Unknown |
| ELT Type | -- |
| Aircraft Owner Name | MALLINCKRODT GROUP INC. |
| Aircraft Owner Street Address | 7733 FORSYTH BOULEVARD |
| Aircraft Owner City | ST LOUIS |
| Aircraft Owner State | MO |
| Aircraft Owner Country | |
| Aircraft Owner Zipcode | 63105 |
| Operator is an individual? | -- |
| Operator Name | |
| Operator Same as Owner? | Yes |
| Operator Is Doing Business As | -- |
| Operator Address Same as Owner? | No |
| Operator Street Address | 5995 NORTH MCDONNELL BLVD |
| Operator City | ST LOUIS |
| Operator State | MO |
| Operator Country | |
| Operator Zip code | 63134 |
| Operator Code | |
| Owner has at least one certificate | None |
| Other Operator of large aircraft? | No |
| Certified for Part 133 or 137 Operation | Unknown |
| Operator Certificate Number | -- |
| Indicates whether an air carrier operation was scheduled or not | -- |
| Indicates Domestic or International Flight | -- |
| Operator carrying Pax/Cargo/Mail | -- |
| Type of Flying (Per_Bus / Primary) | Executive/Corporate |
| Second Pilot on Board | Yes |
| Departure Point Same as Event | Yes |
| Departure Airport Code | PSP |
| Departure City | |
| Departure State | CA |
| Departure Country | |
| Departure Time | 1220 |
| Departure Time Zone | PDT |
| Destination Same as Local Flt | -- |
| Destination Airport Code | STL |
| Destination City | ST LOUIS |
| Destination State | MO |
| Destination Country | |
| Specific Phase of Flight | Takeoff |
| Report sent to ICAO? | -- |
| Evacuation occurred | -- |
| Date of most recent change to record | Jan 2 2001 10:30AM |
| User who most recently changed record | dbo |
| Since inspection or accident | -- |
| Event Location Runway Number and Location | 31L |
| Runway Length | 8500 |
| Runway Width | 150 |
| Sight Seeing flight | No |
| Air Medical Flight | No |
| Medical Flight | -- |