NTSB Identification: MIA85IA203.
The docket is stored on NTSB microfiche number 28889.
Nonscheduled 14 CFR
Incident occurred Monday, June 24, 1985 in SAN JUAN
Aircraft: MITSUBISHI MU-2K, registration: N7DD
Injuries: 3 Uninjured.

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

AFTER DEPARTURE THE NOSE GEAR UNSAFE LIGHT REMAINED ILLUMINATED PETER GEAR RETRACTION. ATTEMPTS TO GET A SAFE LIGHT ON THE NOSE GEAR IN THE EXTENDED POSITION WAS UNSUCCESSFUL AND WHEN THE AIRCRAFT LANDED IT SETTLED ONTO A PARTIALLY RETRACTED NOSE GEAR. INSPECTION OF THE AIRCRAFT REVEALED THAT THE NOSE GEAR STRUT HAD NOT FULLY EXTENDED AND THAT WHEN THE GEAR WAS RETRACTED THE NOSE GEAR TIRES CAUGHT THE NOSE GEAR DOORS PREVENTING THEM FROM OPENING. THE GEAR RETRACTED AGAINST THE GEAR DOORS CAUSING FAILURE OFTHE RETRACT JACKSCREW. A MICROSWITCH WHICH CUTS THE GEAR MOTOR OFF WHEN THIS CONDITION OCCURRS WAS FOUND OUT OF ADJUSTMENT AND DID NOT OPERATE. ADDITIONALLY IT WAS FOUND THAT THE MECHANICS WHO DID THE LAST GEAR RETRACT TEST ON THE AIRCRAFT USED A MAINTENANCE MANUAL FOR AN EARLIER MODEL AIRCRAFT WHICH DID NOT HAVE THIS SAFETY SWITCH THUS FAILING TO CHECK IT FOR ADJUSTMENT. NO REASON AS TO WHY THE NOSE GEAR STRUT DID NOT FULLY EXTEND WAS FOUND.

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

LANDING GEAR,NOSE GEAR..BINDING(MECHANICAL)

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

LANDING GEAR,NOSE GEAR..DISCONNECTED

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

DOOR,LANDING GEAR..MOVEMENT RESTRICTED

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

LANDING GEAR,NOSE GEAR..MOVEMENT RESTRICTED

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

LANDING GEAR,NORMAL RETRACTION/EXTENSION ASSEMBLY..OVERLOAD

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