AD 73-07-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Atlantic Coast Seaplanes LLC | G-21C | Airworthiness Directives; McKinnon Model G-21 Series Airplanes |
| aircraft | Atlantic Coast Seaplanes LLC | G-21D | Airworthiness Directives; McKinnon Model G-21 Series Airplanes |
| aircraft | Atlantic Coast Seaplanes LLC | G-21E | Airworthiness Directives; McKinnon Model G-21 Series Airplanes |
| aircraft | Atlantic Coast Seaplanes LLC | G-21G | Airworthiness Directives; McKinnon Model G-21 Series Airplanes |
Unsafe Condition
Failure of the elevator or rudder torque tubes due to cracks or corrosion could cause hazards in flight.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect torque tubes for cracks or corrosion and repair or replace as needed. For assemblies with over 6000 hours or 7 years, inspect support tubes for corrosion, remove and inspect bellcranks, arms, pedals for corrosion/cracking, discard specific torque tubes and install new ones, then reassemble and restart inspection program. Allow flight to repair location under FAR 21.197 if corroded but uncracked.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within one (1) month after the effective date of this AD, and at intervals not to exceed twelve (12) months from last inspection for applicable assemblies. For those with over 6000 hours or 7 years, within the next year.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Atlantic Coast Seaplanes LLC Model G-21C, G-21D, G-21E, G-21G with torque tube assemblies (Gruman Part Numbers 12755-1, 12756-1, 12757-1, 12758-1) and support tubes (Part Numbers 12725-1 and -2).
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.