NTSB Identification: BFO93LA020.
The docket is stored on NTSB microfiche number 48177.
Scheduled 14 CFR
Accident occurred Sunday, January 10, 1993 in MANCHESTER, NH
Probable Cause Approval Date: 10/13/1993
Aircraft: DORNIER DO-228-202, registration: N245RP
Injuries: 5 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.
DURING THE INITIAL CLIMB AFTER TAKEOFF, THE PILOT REPORTED THAT WHEN THE GEAR WAS RETRACTED, THERE WAS AN UNSAFE GEAR WARNING. AFTER SEVERAL UNSUCCESSFUL ATTEMPTS TO CORRECT THE CONDITION, INCLUDING RECYCLING THE GEAR FOUR TIMES, THE FLIGHT DIVERTED. ALTHOUGH THE PILOT HAD DOWN AND LOCK INDICATION FOR THE THREE GEAR DURING THE RECYCLING, AFTER THE FOURTH CYCLE, THERE WAS NO GEAR INDICATION, DESPITE ATTEMPTS TO EXTEND IT USING THE EMERGENCY GEAR EXTENSION SYSTEM. THE PILOT DID A LOW PASS OVER THE AIRPORT WHERE AIR TRAFFIC CONTROL PERSONNEL CONFIRMED THE NOSE GEAR WAS NOT EXTENDED. THE PILOT SUBSEQUENTLY LANDED NOSE GEAR UP. EXAMINATION OF THE NOSE GEAR ASSEMBLY REVEALED THE NOSE GEAR SHOCK STRUT WAS COLLAPSED ABOUT THREE QUARTERS OF AN INCH FROM FULL EXTENSION, WHICH PREVENTED THE STRUT FROM ENGAGING THE UPLOCK DURING RETRACTION, AND PREVENT THE DEACTIVATION OF THE UNSAFE WARNING DURING EXTENSION. IT WAS ALSO DETERMINED THAT THE PARTIALLY EXTENDED STRUT COULD IMPROPERLY CONTACT THE UPLOCK, RESTRICTING THE MOVEMENT OF THE STRUT. FURTHER DISASSEMBLY CONFIRMED THE INCORRECT INSTALLATION OF THE TWO INTERNAL SEALS, WHICH WOULD PREVENT THE STRUT FROM EXTENDING FULLY.
The National Transportation Safety Board determines the probable cause(s) of this accident to be: INCORRECT INSTALLATION OF THE SEALS IN THE NOSE GEAR ASSEMBLY, WHICH PREVENTED THE NOSE GEAR FROM LOCKING IN THE DOWN POSITION.
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