# AD 69-24-03: Carburetors

- Type: Airworthiness directive
- Status: Current
- Products: Continental Motors A-65-1, A-65-12, A-65-12F, A-65-12FJ, A-65-12J, A-65-14, A-65-14F, A-65-14FJ, A-65-14J, A-65-3, A-65-6, A-65-6J and 312 more
- Effective: November 29, 1969
- Superseded by: Nothing supersedes this AD
- Product type: Appliance
- Amendment: 39-881
- Registered aircraft: 99,353 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/670FCCEB061EB0FA86256A330055C0A0.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/69-24-03

## The airworthiness directive

69-24-03 MARVEL-SCHEBLER: Amdt. 39-881. Applies to Marvel Schebler Models MA-3-A, MA-3-PA, MA-3-SPA, MA-4-SPA, MA-4-5, MA-5, MA-4-5-AA, MA-6AA, and HA-6 carburetors of the following listed part numbers and serial numbers installed on the Continental, Franklin and Lycoming model engines as specified below, to wit:

ENGINE MANUFACTURER & MODEL CARBURETOR MODEL CARBURETOR PART NUMBER CARBURETOR SERIAL NUMBERS CONTINENTAL

A-65 & A-75 Series MA-3-PA A-10-4233 P-22-460 thru P-22-464 O-200 Series MA-3-SPA A10-4115-1 AV-4-4094 O-200 Series MA-3-SPA A10-4894 BE-14-10218 thru BE-15-11672 C-85 Series MA-3-SPA A10-4240 AU-15-235 thru AU-15-244 C-90 Series MA-3-SPA A10-4252 Q-23-2422 thru Q-23-2436 C-145 Series MA-3-SPA A10-4895 BF-14-3598 thru BF-15-3655 O-470-K MA-4-5 A10-3965-12 H-3-6894 thru H-3-6896 O-470-R MA-4-5 A10-4893 BD-13-3946 thru BD-15-4660 FRANKLIN

4A-235 Series MA-3-SPA A10-4654 BN-3-112 thru BN-3-130 GA-335 Series MA-5 A10-4865 BC-14-530 thru BC-16-706 6V-350 Series MA-5 A10-4809 BA-14-203 thru BA-14-207 6A-350 Series MA-5 A10-4865 BC-14-530 thru BC-16-706 LYCOMING

O-235 Series MA-3-A A10-3103-1 Y-30-3132 thru Y-30-3275 O-235 Series MA-3-A A10-4953 BV-0-268 thru BV-0-538 O-235 Series MA-3-PA A10-4978-1 BQ-3-252 thru BQ-3-276 O-235 Series MA-3-PA A10-5050 BY-0-100 thru BY-1-291 O-290 Series MA-3-SPA A10-3346-1 B-35-342 thru B-36-359 O-320 Series MA-4-SPA A10-3678-32 A-25-14781 thru A-26-16246 O-320 Series MA-4-SPA A10-5009 BL-5-2632 thru BL-5-3435 O-360 Series MA-4-5 A10-3878 G-34-4651 thru G-36-5362 O-360 Series MA-4-5 A10-4164-1 K-27-6460 thru K-27-6602 O-360 Series MA-4-5 A10-5034 BU-0-283 thru BU-0-383 O-360 Series HA-6 A10-5045 BW-0-198 thru BW-4-550 VO-435 Series MA-4-5-AA A10-4025-12 Z-16-2304 thru Z-18-2434 TVO-435 Series MA-6-AA A10-4438-1 AH-19-3676 thru AH-21-4067 O-540 Series MA-4-5 A10-4404 R-24-6530 thru R-26-6916 O-540 Series MA-4-5 A10-4404-1 AO-20-3571 thru AO-23-3829 O-540 Series MA-4-5 A10-5042 BS-1-427 thru BS-1-588 O-540 Series MA-4-5 A10-5054 BZ-0-100 thru BZ-0-209 VO-540 Series MA-6-AA A10-4218-1 AK-17-1274 thru AK-19-1478 VO-540 Series MA-6-AA A10-4975 BK-2-125 thru BK-3-148

NOTE: The affected carburetors listed above were manufactured between December 5, 1968, and June 23, 1969. Approximately 25% of these carburetors have been inspected and cleaned by Marvel Schebler or the manufacturers of the engines or aircraft on which the carburetors are installed. Marvel Schebler Service Bulletin A1-69 lists the carburetors remaining to be inspected and covers the same subject matter as this AD. Any carburetor serial numbers included in this AD but not listed on Marvel Schebler Service Bulletin A1-69 comply with this AD, and require no further inspection or cleaning. A logbook entry of compliance and nameplate marking must be made on these unlisted carburetors. The "A" prefix to the part numbers listed above does not appear on the carburetor nameplate.

Compliance: Required within the next 25 hours' time in service after the effective date of this AD, unless previously accomplished.

To prevent possible power losses due to blockage of carburetor metering passeges by thread lubricant or other foreign material, accomplish the following or an equivalent procedure approved by the Chief, Engineering and Manufacturing Branch, FAA, Central Region, or Chief, Engineering and Manufacturing Branch, FAA, Eastern Region:

Remove the carburetor bowl drain plug with the aircraft fuel valve in the "ON" position and allow the carburetor to flush for 20 to 30 seconds. The auxiliary pump, if installed, should be operating. After flushing, inspect the drain plug cavity and drain plug for thread lubricant or other foreign material and remove any such material noted. After cleaning, reflush 20 to 30 seconds, reinstall plug approximately one thread into cavity, apply Parker Seal Lube or equivalent on exposed threads and tighten.

NOTE: If practical, aircraft should be positioned so that bottom of bowl slopes toward drain opening during flushing and cleaning. Recommended torque for 1/8" pipe plug is 50-60 in. lbs., for 1/4" pipe plug is 120-144 in. lbs.

After completion of the above, impression stamp or engrave "A1" on a nameplate or apply approximately 1/4-inch diameter dot of yellow enamel or similar permanent material to nameplate.

This amendment becomes effective November 29, 1969.

## Affected data sheets (15) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS E-286](https://openairdocs.org/tcds/E-286): Lycoming Engines; names 61 of 72 models: O-360-C1C, O-360-C1A, O-360-E2AD, O-360-E2BD, O-360-B1A, O-360-A1A, O-360-A1H6, O-360-A1G6…
- [TCDS E-274](https://openairdocs.org/tcds/E-274): Lycoming Engines; names 60 of 60 models: O-320-H3BD, O-320-D2G, O-320-E2G, O-320-D3G, O-320-C2B, O-320-E2B, O-320-E2C, O-320-D2H…
- [TCDS E-295](https://openairdocs.org/tcds/E-295): Lycoming Engines; names 46 of 47 models: O-540-L3C5D, O-540-J2B5D, O-540-J1B5D, O-540-B2C5, O-540-B1D5, O-540-G2A5, O-540-H2A5, O-540-H1B5D…
- [TCDS E-223](https://openairdocs.org/tcds/E-223): Lycoming Engines; names 42 of 43 models: O-235-K2C, O-235-M3C, O-235-A, O-235-F2A, O-235-P2A, O-235-E1, O-235-J2B, O-235-C2B…
- [TCDS E-205](https://openairdocs.org/tcds/E-205): Continental Aerospace Technologies, Inc.; names 21 of 21 models: A-65-14F, A-65-8FJ, A-65-9F, A-65-14FJ, A-65-9J, A-65-12F, A-65-3, A-65-9…
- [TCDS E-304](https://openairdocs.org/tcds/E-304): Lycoming Engines; names 21 of 21 models: VO-540-B2G, VO-540-B2A, VO-540-B2D, VO-540-B1B3, VO-540-B1D, VO-540-B1C, VO-540-B1A, VO-540-A2A…
- [TCDS E-252](https://openairdocs.org/tcds/E-252): Continental Aerospace Technologies, Inc.; names 15 of 15 models: C90-8F, O-200-A, C90-12F, C90-12FP, O-200-C, C90-8FJ, C90-14FJ, C90-12FH…
- [TCDS E9EA](https://openairdocs.org/tcds/E9EA): Franklin Sp. z.o.o.; names 12 of 12 models: 6A-350-D1A, 6A-350-C1A, 6V-350-B, 6A-350-C2A, 6A-350-C1R, 6V-350-A, 6A-350-C1, 6A-350-C2…
- [TCDS 1E13](https://openairdocs.org/tcds/1E13): Lycoming Engines; names 10 of 11 models: TVO-435-D1B, TVO-435-A1A, TVO-435-E1A, TVO-435-C1A, TVO-435-B1B, TVO-435-B1A (O-435-25A), TVO-435-G1B, TVO-435-D1A…
- [TCDS E-213](https://openairdocs.org/tcds/E-213): Continental Aerospace Technologies, Inc.; names 9 of 9 models: A75-3, A75-9, A75-6J, A75-8, A75-9J, A75-6, A75-8J, A75-8FJ…
- [TCDS E-233](https://openairdocs.org/tcds/E-233): Continental Aerospace Technologies, Inc.; names 8 of 31 models: C85-14F, C85-12F, C85-8FHJ, C85-12J, C85-8FJ, C85-12FJ, C85-15, C85-15F
- [TCDS E-279](https://openairdocs.org/tcds/E-279): Lycoming Engines; names 7 of 7 models: VO-435-A1A (O-435-21), VO-435-A1F, VO-435-A1C (O-435-23; -23A; -23B; -23C), VO-435-A1E, VO-435-A1D (O-435-6A), VO-435-B1A, VO-435-A1B (O-435-6)
- [TCDS E6EA](https://openairdocs.org/tcds/E6EA): Franklin Sp. z.o.o.; names 6 of 6 models: 4A-235-B2, 4A-235-B31, 4A-235-B6, 4A-235-B3, 4A-235-B, 4A-235-B4
- [TCDS E-253](https://openairdocs.org/tcds/E-253): Continental Aerospace Technologies, Inc.; names 3 of 8 models: C145-2, C145-2H, C145-2HP
- [TCDS E-273](https://openairdocs.org/tcds/E-273): Continental Aerospace Technologies, Inc.; names 2 of 21 models: O-470-R, O-470-K

## 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: 99,353 (0 by airframe model, 99,353 by engine model)
- Makers: Cessna 38,796, Piper 28,974, Aeronca 3,546, Beech 1,782, Mooney 1,727, Taylorcraft 1,706, Grumman American Avn. 1,514, Luscombe 1,360, Champion 1,336, Robinson Helicopter 1,194

Models with the most aircraft:

- [Lycoming 0-320 series](https://openairdocs.org/engine/lycoming-0-320-series): 27,057 aircraft (engine model)
- [Continental O-470 series](https://openairdocs.org/engine/continental-o-470-series): 12,779 aircraft (engine model)
- [Lycoming O&VO-360 series](https://openairdocs.org/engine/lycoming-o-vo-360-series): 11,931 aircraft (engine model)
- [Continental 0-200 series](https://openairdocs.org/engine/continental-0-200-series): 8,790 aircraft (engine model)
- [Continental A&C65 series](https://openairdocs.org/engine/continental-a-c65-series): 7,967 aircraft (engine model)
- [Lycoming 0-235 series](https://openairdocs.org/engine/lycoming-0-235-series): 6,133 aircraft (engine model)
- [Lycoming 0-540 series](https://openairdocs.org/engine/lycoming-0-540-series): 5,228 aircraft (engine model)
- [Continental C85 series](https://openairdocs.org/engine/continental-c85-series): 4,671 aircraft (engine model)
- [Continental C90 series](https://openairdocs.org/engine/continental-c90-series): 2,149 aircraft (engine model)
- [Continental C145 series](https://openairdocs.org/engine/continental-c145-series): 1,828 aircraft (engine model)
- [Continental A&C75 series](https://openairdocs.org/engine/continental-a-c75-series): 1,504 aircraft (engine model)
- [Lycoming O-360 series](https://openairdocs.org/engine/lycoming-o-360-series): 1,023 aircraft (engine model)
- [Lycoming 0-360-A1D](https://openairdocs.org/engine/lycoming-0-360-a1d): 968 aircraft (engine model)
- [Lycoming O-360-A1A](https://openairdocs.org/engine/lycoming-o-360-a1a): 601 aircraft (engine model)
- [Lycoming O-360-A4M](https://openairdocs.org/engine/lycoming-o-360-a4m): 418 aircraft (engine model)
- [Continental O-200 series](https://openairdocs.org/engine/continental-o-200-series): 329 aircraft (engine model)
- [Lycoming O-360-A1P](https://openairdocs.org/engine/lycoming-o-360-a1p): 302 aircraft (engine model)
- [Lycoming O-540-F1B5](https://openairdocs.org/engine/lycoming-o-540-f1b5): 299 aircraft (engine model)
- [Continental O-200A](https://openairdocs.org/engine/continental-o-200a): 295 aircraft (engine model)
- [Lycoming O-320-E2D](https://openairdocs.org/engine/lycoming-o-320-e2d): 258 aircraft (engine model)

All 204 models: https://openairdocs.org/ad/69-24-03/models.md
Every aircraft: https://openairdocs.org/ad/69-24-03/aircraft.md

Its text cites no advisory circulars or STCs.

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