NTSB Identification: LAX87FA072.
The docket is stored on NTSB microfiche number 46178.
Accident occurred Thursday, January 01, 1987 in VAN NUYS, CA
Probable Cause Approval Date: 11/10/1992
Aircraft: NORTH AMERICAN T-28C, registration: N9022Y
Injuries: 1 Fatal,1 Minor.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

THE PLTS WERE PRACTICING LNDGS, AND WERE ON THE 3RD FLT AFTER THE ENG HAD BEEN OVERHAULED. AFTER TAKEOFF FROM A TOUGH-&-GO, THE INSTRUCTOR NOTICED THAT THE OIL TEMP WAS HIGH. SOON THEREAFTER, THE ENG BEGAN TO RUN ROUGH, THEN IT SEIZED. UNABLE TO GET BACK TO THE RWY, HE LANED IN A PLOWED FLD. HE SAID HE INTENDED TO LND WITH THE GEAR RETRACTED, BUT THE ACFT TOUCHED DOWN WITH THE GEAR EXTDD, THEN BOUNCED & NOSED OVR. THE CFI BELIEVED THE STUDENT MAY HAVE EXTDD THE GEAR, JUST BFR LNDG. INV REVEALED A CATASTROPHIC INTERNAL FAILURE OF THE ENG HAD OCCURRED. THERE WAS EVIDENCE OF AN OVERSPEED. A WITNESS RPRTD THAT DUE TO IMPROPER INSTLN OF THE CARB THROTTLE ARM, THE ENG WENT TO FULL PWR, WHEN IT WAS STARTED AFTER OVERHAUL. RPRTDLY, IT STAYED AT FULL PWR FOR SVRL MIN BFR IT COULD BE SHUT DOWN. A TEARDOWN REVEALED THE CONNECTING RODS HAD FAILED, THE CYL SKIRTS WERE DMGD, 1 PISTON WAS DESTROYED & OTRS WERE DMGD, SVRL BEARINGS WERE WORN & OVERHEATED, METAL CHIPS/CONTAMINATION FND IN ENG & OIL SYS. ENG HAD BEEN OPERD ABOUT 7 HRS SINCE OVERHAUL.

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

ENGINE ASSEMBLY..OVERSPEED

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

MAINTENANCE..IMPROPER..OTHER MAINTENANCE PERSONNEL

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

ENGINE ASSEMBLY,CONNECTING ROD..FAILURE,TOTAL


Contributing Factors

GEAR EXTENSION..INTENTIONAL..DUAL STUDENT


Contributing Factors

CREW/GROUP COORDINATION..INADEQUATE..DUAL STUDENT


Contributing Factors

TERRAIN CONDITION..SOFT

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