ASN Wikibase Occurrence # 357587
This information is added by users of ASN. Neither ASN nor the Flight Safety Foundation are responsible for the completeness or correctness of this information.
If you feel this information is incomplete or incorrect, you can submit corrected information.
| Date: | Wednesday 3 April 1996 |
| Time: | 14:38 LT |
| Type: |  ATR 42-300 |
| Owner/operator: | Simmons Airlines |
| Registration: | N421MQ |
| MSN: | 014 |
| Total airframe hrs: | 18976 hours |
| Engine model: | P&W PW120 |
| Fatalities: | Fatalities: 0 / Occupants: 36 |
| Aircraft damage: | Minor |
| Category: | Serious incident |
| Location: | Traverse City, MI -
 United States of America
|
| Phase: | Landing |
| Nature: | Unknown |
| Departure airport: | Chicago, IL (KORD) |
| (KTVC) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
During landing rollout, the left main landing gear collapsed, and the aircraft skidded to a stop. Examination of the landing gear revealed that the barrel lugs (used to attach the swinging lever to the main landing gear barrel) had failed. The fracture of the outboard lower lug exhibited clam shell marks typical of a fatigue crack. The fatigue crack emanated from a corrosion pit in the bore of the lug. The four bushings for the lower lugs of the barrel (replaced during overhaul) did not have the proper interference fit. The bushings did not have the proper applications of corrosion preventative applied to the surface of the bushings. Primer paint had not been applied during overhaul, and Mastinox was used instead of the wet primer that the manufacturer's procedures specified. During the course of the investigation, nine landing gears (with various numbers of total cycles since overhaul or manufacture) were inspected. The inspections revealed torn or missing rubber sealant used on bushing flanges, corrosion in the lug bores, and corrosion on the lug faces.
Probable Cause: improper use of procedures by maintenance personnel at an overhaul facility during overhaul of the landing gear, allowing corrosion to occur on the barrel lugs of the landing gear, which subsequently led to fatigue cracking of the lugs and eventual collapse of the gear.
Accident investigation:
 |
|
Sources:
NTSB CHI96IA125
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 13-Mar-2024 19:34 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
The Aviation Safety Network is an exclusive service provided by:
Quick Links:
| ASN Home | Send Correction / Feedback |
| FSF Home | Disclaimer | Copyright |
| Contact Us | Privacy Policy |
| Press / Media |
CONNECT WITH US:
©2024 Flight Safety Foundation