AD 70-12-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Kelowna Flightcraft R & D Ltd. | 340 | Airworthiness Directives; GENERAL DYNAMICS Models 340 and 440 Series Airplanes |
| aircraft | Kelowna Flightcraft R & D Ltd. | 440 | Airworthiness Directives; GENERAL DYNAMICS Models 340 and 440 Series Airplanes |
Unsafe Condition
Cracking in the upper flange radius area of MLG beam webs P/N 340-1650551-7, -8, -53 and -54 due to fatigue.
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Required Actions
Visually inspect MLG beam webs using dye penetrant inspection per General Dynamics SB 57-3 or equivalent. If cracks exceed seven inches total length or extend beyond two inches from trunnion fitting, replace beam web. For cracks under 2.75 inches in chordwise direction, either stop drill and reinspect every 50 hours or replace. Cracks between 2.75-7 inches must be either replaced, stop drilled with reinforcement, or repaired per SB 57-3, then reinspected every 500 hours.
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Compliance Time
Within the next 50 hours time in service after the effective date, unless already accomplished within the last 450 hours time in service. Subsequent inspections at intervals not to exceed 500 hours time in service, or 50 hours time in service if cracks were found.
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Affected Aircraft
GENERAL DYNAMICS Models 340 and 440 Series airplanes including those modified with STC SA4-1100 or STC SA1096WE.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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