NTSB Identification: NYC88LA085.
The docket is stored on NTSB microfiche number 37595.
Accident occurred Friday, February 12, 1988 in PHILADELPHIA, PA
Probable Cause Approval Date: 09/25/1989
Aircraft: MITSUBISHI MU-2B-35, registration: N339MA
Injuries: 1 Uninjured.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

THE MITSUBISHI MU-2B-35 LANDED AND DAMAGE WAS OBSERVED ON THE UNDERSIDE OF THE LEFT WING MIDWAY BETWEEN THE ENGINE AND TIP TANK AND OUTBOARD TO THE TIP TANK. FURTHER EXAMINATION OF THE WING SHOWED A BROKEN LOWER FRONT WING SPAR AND A BENT REAR LOWER WING SPAR. THE PILOT SAID HE ENCOUNTERED TURBULENCE WHILE CRUISING AT 250 KTS. HE SAID HE SLOWED TO 170 KTS AND THEN RESUMED SPEED TO 250 KTS. AFTER MITSUBISHI EXAMINED THE WING, THEY SAID THE DAMAGE WAS CAUSED BY EITHER A HARD LANDING OR LANDING WITH EXCESS FUEL IN THE TIP TANK. THEY ALSO SAID IT WAS LIKELY THAT THE AIRCRAFT HAD BEEN FLOWN SEVERAL TIMES WITH THE WING DAMAGE PRESENT.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

DESIGN STRESS LIMITS OF AIRCRAFT..EXCEEDED..UNKNOWN



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