AD 73-13-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Continental Motors | O-470-J | TELEDYNE CONTINENTAL MOTORS Models O-470-J, O-470-K, O-470-L, and O-470-R Engines |
| engine | Continental Motors | O-470-K | TELEDYNE CONTINENTAL MOTORS Models O-470-J, O-470-K, O-470-L, and O-470-R Engines |
| engine | Continental Motors | O-470-L | TELEDYNE CONTINENTAL MOTORS Models O-470-J, O-470-K, O-470-L, and O-470-R Engines |
| engine | Continental Motors | O-470-R | TELEDYNE CONTINENTAL MOTORS Models O-470-J, O-470-K, O-470-L, and O-470-R Engines |
Unsafe Condition
The carburetor bowl 1/4" drain plug may become loose or damaged, leading to leakage or seepage.
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Required Actions
Inspect the carburetor bowl 1/4" drain plug for security by applying 120 to 144 in. lbs. of torque. Check for leakage or seepage after torque application. Replace drain plug and check for thread damage if leakage occurs, then apply an identifying yellow dot enamel or similar paint adjacent to the drain plug.
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Compliance Time
within the next five hours time in service after the effective date of this Airworthiness Directive
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Affected Aircraft
Teledyne Continental Motors Models O-470-J, O-470-K, O-470-L, and O-470-R Engines with specified serial ranges: O-470-J (REMANUFACTURED S/N 46949-47000, 202001-202060); O-470-K (REMANUFACTURED S/N 49210-49302); O-470-L (REMANUFACTURED S/N 69352-69491); O-470-R (NEW S/N 451001-451285; REMANUFACTURED S/N 98501-99000, 2120001-212289)
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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