AD 67-11-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Revo, Incorporated | Colonial C-1 | Airworthiness Directives; Colonial Aeronautics Models Colonial C-1, Colonial C-2, Lake LA-4P, Lake LA-4A, Lake LA-4 |
| aircraft | Revo, Incorporated | Colonial C-2 | Airworthiness Directives; Colonial Aeronautics Models Colonial C-1, Colonial C-2, Lake LA-4P, Lake LA-4A, Lake LA-4 |
| aircraft | Revo, Incorporated | Lake LA-4 | Airworthiness Directives; Colonial Aeronautics Models Colonial C-1, Colonial C-2, Lake LA-4P, Lake LA-4A, Lake LA-4 |
| aircraft | Revo, Incorporated | Lake LA-4A | Airworthiness Directives; Colonial Aeronautics Models Colonial C-1, Colonial C-2, Lake LA-4P, Lake LA-4A, Lake LA-4 |
| aircraft | Revo, Incorporated | Lake LA-4P | Airworthiness Directives; Colonial Aeronautics Models Colonial C-1, Colonial C-2, Lake LA-4P, Lake LA-4A, Lake LA-4 |
Unsafe Condition
Failure of the fuel pressure gauge instrument line could allow unrestricted fuel to enter the cabin compartment.
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Required Actions
Braze a 3/16" diameter x 3/8" aluminum alloy rod into the 9 o'clock position of the AN 824-4D fitting and drill with a #60 drill. Install the 'T' assembly in the fuel pressure gauge instrument line above the firewall with the orifice end at 6 o'clock, and cap the open end with an AN929-D4 cap. For Colonial C-1 models, remove the AN 894D6-4 reducer, tap a 3/16-24NF thread, insert a threaded 3/16" aluminum rod with Loctite sealant, and drill the rod with a #60 drill.
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Compliance Time
within 25 hours' time in service after April 5, 1967
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Affected Aircraft
Colonial Aeronautics models Colonial C-1 (S/N 1 through 14, 16 through 20, 22 through 25), Colonial C-2 (S/N 115, 126 through 143), Lake LA-4P (S/N 121), Lake LA-4A (S/N 244 and 245), Lake LA-4 (S/N 246 through 356)
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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