NTSB Identification: DEN88IA207.
The docket is stored on NTSB microfiche number 37457.
Scheduled 14 CFR
Incident occurred Friday, September 16, 1988 in DENVER, CO
Probable Cause Approval Date: 01/25/1990
Aircraft: BEECH 1900, registration: N32017
Injuries: 9 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.

CONTINENTAL EXPRESS FLIGHT 206, A BEECH 1900 AIRLINER, DEPARTED DENVER, CO, FOR NORTH PLATTE, NE. DURING DESCENT FOR LANDING, PILOT ATTEMPTED TO LOWER GEAR. LEFT MAIN AND NOSE GEARS LOCKED DOWN BUT RIGHT MAIN STUCK IN INTERMEDIATE POSITION. PILOT ATTEMPTED TO EXTEND GEAR VIA MANUAL EXTENSION AND ACCELERATED 'G' MANEUVERS. BOTH ATTEMPTS FAILED. FLIGHT RETURNED TO DENVER AND PILOT EXECUTED WHEELS-UP LANDING. POST-INCIDENT EXAMINATION DISCLOSED FOREIGN MATERIAL LODGED IN POPPET SEAT AND RETAINER OF LANDING GEAR ACTUATOR EXTEND PORT. ACTUATOR WAS CLEANED, REASSEMBLED, AND FUNCTIONALLY TESTED OK. FOREIGN SUBSTANCE WAS ANALYZED BY FOURIER TRANSFORM INFRARED SPECTROSCOPY AND IDENTIFIED AS LOW DENSITY POLYETHYLENE (I.E. PLASTIC BAG OR DUST COVER). RESIDUE ON FOREIGN SUBSTANCE WAS IDENTIFIED AS MIL-H-5606 HYDRAULIC FLUID. INVESTIGATION DISCLOSED SUBSTANCE COULD HAVE BEEN INTRODUCED INTO ACTUATOR DURING MANUFACTURE OR INTO HYDRAULIC SYSTEM DURING AIRCRAFT ASSEMBLY.

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

LANDING GEAR,NORMAL RETRACTION/EXTENSION ASSEMBLY..JAMMED

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

FLUID,HYDRAULIC..CONTAMINATION


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