ASN Wikibase Occurrence # 221708
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| Date: | Monday 18 June 2018 |
| Time: | 12:30 |
| Type: |  Cessna TR182 |
| Owner/operator: | Private |
| Registration: | N756SW |
| MSN: | R18201148 |
| Year of manufacture: | 1979 |
| Total airframe hrs: | 3661 hours |
| Engine model: | Lycoming O-540-L3C5D |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Beloit, KS -
 United States of America
|
| Phase: | Approach |
| Nature: | Private |
| Departure airport: | Beloit, KS (K61) |
| Beloit, KS (K61) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The private pilot was practicing takeoffs and landings in the airport traffic pattern when the left main landing gear (MLG) failed to extend. He cycled the gear, but the left MLG still would not extend. He then attempted to manually extend the gear without success. The pilot subsequently executed an emergency landing on the turf runway.
During recovery of the airplane, one of the left brake caliper’s back plate bolts was found backed out. Scrape marks were present on the fuselage skin, consistent with contact from the extended back plate bolt. The MLG extension/retraction system and the emergency extension system both performed normally during postaccident examination.
An annual inspection had been completed 6 days before the accident, and the airplane had accumulated a total of 3.2 hours since then. The mechanic that performed the inspection reported that the brake calipers were removed at that time and that the bolts had not been secured with safety wire after they were re-installed.
Given the evidence, it is likely that the mechanic did not properly torque the left brake caliper back plate bolt after he re-installed it during the annual inspection, which allowed it to back out and led to the subsequent failure of the left MLG to extend. Although safety wire would have prevented the bolt from backing out, the airframe manufacturer’s service manual was not consistent about whether to use safety wire. Regardless, the bolt would not have backed out if it had been tightened within the specified torque.
Probable Cause: The mechanic’s failure to properly torque one of the left brake caliper’s back plate attachment bolts while re-installing it during the annual inspection, which resulted in the left main landing gear not extending before landing.
Accident investigation:
 |
|
Sources:
NTSB
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 10-Feb-2019 10:49 | ASN Update Bot | Added |
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