AD 71-21-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Kelowna Flightcraft R & D Ltd. | 340 | Airworthiness Directives; GENERAL DYNAMICS Models 340, 440 and C- 131E Airplanes |
| aircraft | Kelowna Flightcraft R & D Ltd. | 440 | Airworthiness Directives; GENERAL DYNAMICS Models 340, 440 and C- 131E Airplanes |
| aircraft | Kelowna Flightcraft R & D Ltd. | Military C-131E | Airworthiness Directives; GENERAL DYNAMICS Models 340, 440 and C- 131E Airplanes |
Unsafe Condition
Failure of lockpins retaining the piston upper bearing and possible subsequent loss of the piston assembly from the main landing gear.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect piston upper bearing retaining lockpins on main landing gears with single or unknown lockpin configurations within 300 hours' time in service from the AD's effective date (or within last 1200 hours if already done) and every 1500 hours thereafter. For gears with more than a single lockpin configuration, inspect within 1000 hours' time in service (or within last 2000 hours if already done) and every 3000 hours thereafter. Replace loose or damaged lockpins before further flight. Inspections intervals may be extended to 8000 hours with approved rework or adjusted by FAA upon request.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Effective October 28, 1971
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
GENERAL DYNAMICS Models 340, 440, and C-131E Airplanes, including those using turbopropeller power.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.