AD 94-04-11

final rule
Data completeness: 70%

Airworthiness Directives: Twin Commander Aircraft Corporation Models 500S and 690B Airplanes

AD Number
94-04-11
Status
final_rule
Effective Date
Product Category
aircraft
Docket
92-CE-26-AD
FR Citation
This information is not available.

Applicability

TypeManufacturerModelDetails
aircraft Twin Commander Aircraft LLC 500-S Airworthiness Directives: Twin Commander Aircraft Corporation Models 500S and 690B Airplanes
aircraft Twin Commander Aircraft LLC 690B Airworthiness Directives: Twin Commander Aircraft Corporation Models 500S and 690B Airplanes

Unsafe Condition

Cracks caused by stress corrosion in the wing front spar lower cap (spar cap) could lead to failure of the wing structure.

AI-generated summary from the source AD text. Verify against the official source before acting.

Required Actions

Remove a sample of the spar cap material for metallurgical examination. Depending on results, inspect or replace the spar cap using specified service bulletins or kits. Submit inspection results to FAA within 10 days after inspection or 15 days after AD effective date.

AI-generated summary from the source AD text. Verify against the official source before acting.

Compliance Time

within the next 50 hours time-in-service after the effective date of this AD, unless already accomplished

AI-generated summary from the source AD text. Verify against the official source before acting.

Affected Aircraft

Twin Commander Aircraft Corporation Models 500S (serial numbers 3314 through 3323) and 690B (serial numbers 11480 through 11566)

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.

View Official Source ↗ Find More ADs for Twin Commander Aircraft LLC 500-S

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