On December 3, 1987, a Boeing 727-243 (registration N571PE) was involved in an aviation accident near Houston, TX. No fatalities were reported. Investigators recorded the probable cause as: IMPROPER DRILLING OF THE CROSS HOLE IN THE SLAT TRACK BEARING BOLT, WHICH LED TO ITS FAILURE FROM FATIGUE CRACKING. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive; 8 related events involving the same aircraft type or operator are linked below.
During approach, the number six leading edge slat assembly failed, causing the inboard section to hang down and bend aft. The pilot landed safely. Analysis revealed corrosion, spalling, and drilling damage.
Incident Description
During the approach to landing, the number six leading edge slat assembly failed. The inboard section of the slat hung down and bent aft. The pilot successfully landed the aircraft without further incident.
Post-Incident Examination
Metallurgical analysis of components revealed that a slat track roller bearing contained evidence of corrosion and spalling. Additionally, the slat track bearing bolt that had been installed through the aforementioned bearing exhibited heavy circumferential gouges on the surface of a cross-drilled hole at the areas of fatigue initiation. There was also evidence of tearing typical of damage produced during drilling with a dull drill bit.
Maintenance History
The airplane had completed a major structural maintenance check 48 flight hours and 28 cycles prior to the incident.
What happened in the 3 Dec 1987 Boeing 727-243 accident near Houston, TX?
During approach, the number six leading edge slat assembly failed, causing the inboard section to hang down and bend aft. The pilot landed safely. Analysis revealed corrosion, spalling, and drilling damage.
Were there any fatalities in the 3 Dec 1987 Boeing 727-243 accident?
No fatalities were recorded in this accident.
What aircraft was involved and where did it happen?
The accident on 3 Dec 1987 involved a Boeing 727-243, registration N571PE, at Houston, TX.
What was the probable cause of the accident?
IMPROPER DRILLING OF THE CROSS HOLE IN THE SLAT TRACK BEARING BOLT, WHICH LED TO ITS FAILURE FROM FATIGUE CRACKING.
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