3 DC10-10 aircraft were dispatched and operated for numerous flts with the improper nose landing gea...

Attributes
ACN	421758
Time
Date	199811
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : zzz airport : zzz
State Reference	US
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	DC-10 10
Operating Under FAR Part	Part 121
Flight Phase	other
Flight Plan	None
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	DC-10 10
Operating Under FAR Part	Part 121
Flight Phase	other
Flight Plan	None
Person 1
Affiliation	company : air carrier
Function	other personnel other other personnel other
Qualification	other other : other
ASRS Report	421758
Person 2
Affiliation	company : air carrier
Function	other personnel other other personnel other
Qualification	other other : other
ASRS Report	421759
Events
Anomaly	aircraft equipment problem : critical non adherence : far non adherence : published procedure
Independent Detector	other other : unspecified
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Air Traffic Incident	other

Narrative:

The above idented aircraft had an incorrect part number lock link installed on them for numerous flts. The correct manufacturer's part number for DC10-10 aircraft is abcyxyx-west or abcyxyx-X. The links installed are as follows: aircraft pxp -- manufacturer's part number dxzzz-west serial number mxzy. Aircraft pzp manufacturer's part number dxzzz-west serial number mxzz. Aircraft pyp manufacturer's part number dxzzz-west serial number mxzy. The dxzzz link has a bore which is approximately 0.060 inches larger than the correct link and which results in excessive clearance with the mating parts. A possible failure mode of incorrect mating parts would be the collapse of the nose landing gear. Supplemental information from 421759: based on the understanding that lock link abcyxyx and dxzzz were interchangeable, I authorized a revision to eso to put dxzzz on both links. It has how been determined that these links are not interchangeable. Gear shop also added this air carrier number to the abcyxyx link when it was checked by the stores department. Manufacturer previously had indicated that the 2 links were interchangeable.

Original NASA ASRS Text

Title: 3 DC10-10 ACFT WERE DISPATCHED AND OPERATED FOR NUMEROUS FLTS WITH THE IMPROPER NOSE LNDG GEAR LOCK LINKS INSTALLED.

Narrative: THE ABOVE IDENTED ACFT HAD AN INCORRECT PART NUMBER LOCK LINK INSTALLED ON THEM FOR NUMEROUS FLTS. THE CORRECT MANUFACTURER'S PART NUMBER FOR DC10-10 ACFT IS ABCYXYX-W OR ABCYXYX-X. THE LINKS INSTALLED ARE AS FOLLOWS: ACFT PXP -- MANUFACTURER'S PART NUMBER DXZZZ-W SERIAL NUMBER MXZY. ACFT PZP MANUFACTURER'S PART NUMBER DXZZZ-W SERIAL NUMBER MXZZ. ACFT PYP MANUFACTURER'S PART NUMBER DXZZZ-W SERIAL NUMBER MXZY. THE DXZZZ LINK HAS A BORE WHICH IS APPROX 0.060 INCHES LARGER THAN THE CORRECT LINK AND WHICH RESULTS IN EXCESSIVE CLRNC WITH THE MATING PARTS. A POSSIBLE FAILURE MODE OF INCORRECT MATING PARTS WOULD BE THE COLLAPSE OF THE NOSE LNDG GEAR. SUPPLEMENTAL INFO FROM 421759: BASED ON THE UNDERSTANDING THAT LOCK LINK ABCYXYX AND DXZZZ WERE INTERCHANGEABLE, I AUTHORIZED A REVISION TO ESO TO PUT DXZZZ ON BOTH LINKS. IT HAS HOW BEEN DETERMINED THAT THESE LINKS ARE NOT INTERCHANGEABLE. GEAR SHOP ALSO ADDED THIS ACR NUMBER TO THE ABCYXYX LINK WHEN IT WAS CHKED BY THE STORES DEPT. MANUFACTURER PREVIOUSLY HAD INDICATED THAT THE 2 LINKS WERE INTERCHANGEABLE.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

3 DC10-10 aircraft were dispatched and operated for numerous flts with the improper nose landing gear lock links installed.