AD 78-26-10 R1
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Great Lakes Aircraft Company, LLC (John Duncan) | 2T-1A-1 | Airworthiness Directives; Great Lakes Model 2T-1A-1 and 2T-1A-2 Airplanes |
| aircraft | Great Lakes Aircraft Company, LLC (John Duncan) | 2T-1A-2 | Airworthiness Directives; Great Lakes Model 2T-1A-1 and 2T-1A-2 Airplanes |
Unsafe Condition
Contamination of cockpit heater air with carbon monoxide due to cracks in the support plates of the heat exchanger at both ends between the five tube cluster.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Within 25 hours time-in-service after the effective date, determine if the airplane has P/N 50146 heater system; if equipped, install a walk around inspection in the Flight Manual, and inspect support plates for cracks every 25 hours time-in-service. If cracks found, replace heat exchanger or comply with Paragraph B. Paragraph B requires removing the heater system, installing specified parts, blocking valves and openings, and removing AFM revision if installed.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 25 hours time-in-service after the effective date of this AD, and within each 25 hours time-in-service thereafter for recurring inspections.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Great Lakes Model 2T-1A-1 and 2T-1A-2 airplanes equipped with P/N 50146 cockpit heater system.
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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