NTSB Identification: BFO88IA001.
The docket is stored on NTSB microfiche number 36434.
Scheduled 14 CFR PIEDMONT AVIATION
Incident occurred Saturday, October 03, 1987 in BALTIMORE, MD
Probable Cause Approval Date: 07/10/1989
Aircraft: FOKKER F-28-MK-1000, registration: N288N
Injuries: 56 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.

THE ACFT HAD A MAIN GEAR ONLY LANDING AFTER THE NOSE GEAR FAILED TO LOCK DOWN. THIS WAS THE FIRST FLIGHT SINCE A NEWLY OVERHAULED NOSE GEAR WAS INSTALLED. IT WAS DETERMINED THAT WHEN THE NOSE GEAR WAS INSTALLED AND BEFORE IT WAS CORRECTED, A WRONG WASHER WAS USED WITH A BOLT TO INSTALL PART OF THE DOWNLOCK MECHANISM. THIS RESULTED IN AN UNDETECTED PERMANENT REDUCTION, BELOW THE DESIGN CLEARANCE BETWEEN THE DOWNLOCK PLUNGER AND ITS INTERNAL-BEARING. EXAMINATION OF THE DOWNLOCK AFTER THE LANDING INCIDENT DISCLOSED THAT THERE WAS SCORING OF THE PLUNGER AND ITS BEARING.

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

LANDING GEAR,GEAR LOCKING MECHANISM..MOVEMENT RESTRICTED

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

LANDING GEAR,NOSE GEAR..UNLOCKED

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

MAINTENANCE,INSTALLATION..IMPROPER..COMPANY MAINTENANCE PERSONNEL

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