NTSB Identification: DEN85IA250.
The docket is stored on NTSB microfiche number 29936.
Nonscheduled 14 CFR PORTS OF CALL TRAVEL CLUB
Incident occurred Sunday, September 29, 1985 in DENVER, CO
Aircraft: BOEING 727-100, registration: N721PC
Injuries: 71 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.

DURING GEAR EXTN FOR LNDG, THE FLT CREW NOTED A 'LOUD & VERY NOTICEABLE JOLTING OF THE ACFT.' SHORTLY THEREAFTER, THEY ALSO NOTICED THAT A PORTION OF THE RIGHT MAIN GEAR HAD PUNCTURED THE UPPER SURFACE OF THE RGT WING. THE CREW THEN DECLARED AN EMERGENCY & MADE AN UNEVENTFUL LNDG. AN INVESTIGATION REVEALED THE RGT MAIN GEAR ACTUATOR SUPPORT LINK, PN 65-19657-5, HAD BECOME CORRODED & FAILED. THE OUTBOARD END OF THE MAIN GEAR ACTUATOR BEAM THEN PUNCTURED THE UPPER WING PANEL. ALSO A HYDRAULIC LINE WAS SEVERED, WHICH DISABLED THE 'A' HYDRAULIC SYS. MAINTENANCE RECORDS FROM THE PREVIOUS ACFT OWNER ERRONEOUSLY INDICATED THAT IN 1971, THE FAILED PART HAD BEEN REPLACED WITH A NEWER LINK ASSEMBLY, PN 19657-11, WHICH DID NOT REQUIRE AN INSPECTION. CONSEQUENTLY, THE REQUIRED INSPECTIONS SPECIFIED IN AD 68-17-01, REGARDING THE FAILED LINK, HAD NOT BEEN COMPLIED WITH BY THE NEW OWNER. BOEING HAD ISSUED A SVC BULLETIN (727-32-306) WHICH RECOMMENDED THAT LINK ASSEMBLIES WITH PN 19657-5 (AS WELL AS -4, -8 & -13) BE REMOVED FROM SVC & DISCARDED.

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

MAINTENANCE,RECORDKEEPING..IMPROPER..OTHER MAINTENANCE PERSONNEL

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

LANDING GEAR,NORMAL RETRACTION/EXTENSION ASSEMBLY..CORRODED

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

MAINTENANCE,COMPLIANCE WITH AD..NOT PERFORMED

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

LANDING GEAR,NORMAL RETRACTION/EXTENSION ASSEMBLY..FAILURE,PARTIAL


Contributing Factors

MAINTENANCE,SERVICE BULLETIN/LETTER..NOT FOLLOWED..OTHER MAINTENANCE PERSONNEL

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