# AD 73-13-04: Carburetor Bowl Drain Plug

- Type: Airworthiness directive
- Status: Current
- Products: Continental Motors O-470-J, O-470-K, O-470-L and O-470-R
- Effective: June 20, 1973
- Superseded by: Nothing supersedes this AD
- Product type: Engine
- Amendment: 39-1651
- Registered aircraft: 12,924 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/8065D2B114588DB28625682C006CEF09.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/73-13-04

## The airworthiness directive

73-13-04 TELEDYNE CONTINENTAL MOTORS: Amdt. 39-1651. Applies to the following Teledyne Continental Model engines:

O-470-J REMANUFACTURED: S/N's 46949 through 47000; 202001 through 202060. O-470-K REMANUFACTURED: S/N's 49210 through 49302. O-470-L REMANUFACTURED: S/N's 69352 through 69491. O-470-R NEW: S/N's 451001 through 451285. REMANUFACTURED: 98501 through 99000; and 2120001 through 212289.

Compliance required as indicated within the next five hours time in service after the effective date of this Airworthiness Directive. Unless already accomplished inspect the carburetor bowl 1/4" drain plug for security by applying 120 to 144 in. lbs. of torque. Caution should be exercised in order not to apply excessive torque. After proper torque has been applied, check for leakage or seepage. If seepage or leakage is present, remove drain plug and check for thread damage. Replace as necessary with airworthy parts. After accomplishment of the above, place an identifying yellow dot enamel or similar paint adjacent to the drain plug. This amendment is effective June 20, 1973, and was effective upon receipt for all recipients of the air mail letter dated May 25, 1973, which contained this amendment.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS E-273](https://openairdocs.org/tcds/E-273): Continental Aerospace Technologies, Inc.; names 4 of 21 models: O-470-R, O-470-L, O-470-K, O-470-J

## Registered aircraft it may apply to (OpenAirDocs)

Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment.

- Aircraft: 12,924 (0 by airframe model, 12,924 by engine model)
- Makers: Cessna 12,260, Beech 477, Bellanca 49, Stinson 15, Cessna Ector 14, Downer 14, Camair 7, Navion 7, Ryan 7, Taylorcraft 7

Models with the most aircraft:

- [Continental O-470 series](https://openairdocs.org/engine/continental-o-470-series): 12,779 aircraft (engine model)
- [Continental O-470R](https://openairdocs.org/engine/continental-o-470r): 107 aircraft (engine model)
- [Continental O-470-L](https://openairdocs.org/engine/continental-o-470-l): 19 aircraft (engine model)
- [Continental O-470-K](https://openairdocs.org/engine/continental-o-470-k): 13 aircraft (engine model)
- [Continental O-470-J](https://openairdocs.org/engine/continental-o-470-j): 6 aircraft (engine model)

All 5 models: https://openairdocs.org/ad/73-13-04/models.md
Every aircraft: https://openairdocs.org/ad/73-13-04/aircraft.md

Its text cites no advisory circulars or STCs.

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