AD 94-04-15

final rule
Data completeness: 70%

Airworthiness Directives: Twin Commander Aircraft Corporation Models 500, 560A, 560E, 680, 680E, and 720 Airplanes

AD Number
94-04-15
Status
final_rule
Effective Date
Product Category
aircraft
Docket
92-CE-57-AD
FR Citation
Federal Register: February 22, 1994 (Volume 59, Number 35)

Applicability

TypeManufacturerModelDetails
aircraft Twin Commander Aircraft LLC 500 Airworthiness Directives: Twin Commander Aircraft Corporation Models 500, 560A, 560E, 680, 680E, and 720 Airplanes
aircraft Twin Commander Aircraft LLC 560-A Airworthiness Directives: Twin Commander Aircraft Corporation Models 500, 560A, 560E, 680, 680E, and 720 Airplanes
aircraft Twin Commander Aircraft LLC 560-E Airworthiness Directives: Twin Commander Aircraft Corporation Models 500, 560A, 560E, 680, 680E, and 720 Airplanes
aircraft Twin Commander Aircraft LLC 680 Airworthiness Directives: Twin Commander Aircraft Corporation Models 500, 560A, 560E, 680, 680E, and 720 Airplanes
aircraft Twin Commander Aircraft LLC 680-E Airworthiness Directives: Twin Commander Aircraft Corporation Models 500, 560A, 560E, 680, 680E, and 720 Airplanes
aircraft Twin Commander Aircraft LLC 720 Airworthiness Directives: Twin Commander Aircraft Corporation Models 500, 560A, 560E, 680, 680E, and 720 Airplanes

Unsafe Condition

Failure of the wing structure caused by a cracked wing front spar lower cap at Wing Station (WS) 96 due to interference, fretting, or corrosion between the firewall flange and spar cap flange.

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

Required Actions

Inspect the wing front spar lower cap for corrosion or interference between the firewall flange and spar flange in accordance with Twin Commander SB No. 212. Clear any interference, repair corrosion damage, and replace any cracked spar cap prior to further flight.

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Compliance Time

within the next 50 hours time-in-service after the effective date of this AD

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Affected Aircraft

Twin Commander Aircraft Corporation Models 500 (serial numbers 618 through 750), 560A (231 though 450), 560E (433 through 750), 680 (242 through 658), 680E (623 through 750), and 720 (501 through 750) airplanes that have not had the spar cap replaced per specified procedures.

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

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