# AD 79-04-05: Regulator Diaphragm Stem Assembly - Type: Airworthiness directive - Status: Current - Products: Lycoming Engines AEIO-320-D1B, AEIO-320-E1A, AEIO-320-E1B, AEIO-320-E2A, AEIO-320-E2B, AEIO-360-A1A, AEIO-360-A1B, AEIO-360-A1B6, AEIO-360-A1C, AEIO-360-A1D, AEIO-360-A2A, AEIO-360-A2B and 206 more - Effective: September 26, 1979 - Superseded by: Nothing supersedes this AD - Product type: Engine - Amendment: 39-3570 - Registered aircraft: 23,938 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/5C3A370E31C4B8A486256E120047771F.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/79-04-05 ## The airworthiness directive 79-04-05 AVCO LYCOMING: Amendment 39-3418 as amended by Amendment 39-3570. Applies to all fuel injected Lycoming series engines equipped with the following Bendix Injector Models and Parts List Numbers: Model Parts List and Issue Serial Numbers RSA-5AB1 2524254-4 2524712-1 63758 thru 65862 63503 thru 66027 RSA-5AD1 2524054-4 62999 thru 66249 2524147-6 65988 thru 65997 2524171-4 64961 thru 65060 2524213-4 61032 thru 66290 2524291-4 63678 thru 65867 2524297-3 64428 thru 64432 2524307-3 64828 thru 66854 2524335-3 65721 thru 66920 2524359-3 62401 thru 65412 2524450-2 61392 thru 65987 2524550-1 64635 thru 65887 2524673-1 63643 thru 64265 2524682-1 65071 thru 65499 2524723-1 61928 thru 65231 2524469(B) 64915 thru 65338 RSA-10AD1 2524163-7 63742 thru 65720 2524175-3 63399 thru 66941 and to all Lycoming fuel injected engines irrespective of parts list number or serial number whose Bendix Injector Models RSA-5AD1, RSA-5AB1, and RSA-10AD1 have been overhauled by a Bendix Authorized Warrant Repair Station or by AVCO Lycoming between April 1, 1977, and August 14, 1978, and to all Lycoming fuel injected engines irrespective of parts list number or serial number, whose Bendix Models RSA-5AB1, RSA- 5AD1, and RSA-10AD1 fuel injectors have been overhauled after March 31, 1977, by repair stations other than the above in which the fuel diaphragm has been replaced with a new P/N 2529471 diaphragm assembly. Compliance required within the next 10 hours in service after the effective date of this AD, unless previously accomplished. To prevent an in-flight power loss due to the separation of the P/N 2529192 regulator diaphragm stem assembly, the P/N 2529471 regulator diaphragm assembly must be removed, inspected, and replaced if necessary, in accordance with the Accomplishment Instructions listed in Bendix Energy Controls Division Service Bulletin No. RS-57 Rev. 1 or FAAapproved equivalent. Equivalent methods of compliance must be approved by the Chief, Engineering and Manufacturing Branch, Federal Aviation Administration, Eastern Region. Upon submission of substantiating data by an owner or operator through an FAA Maintenance Inspector, the Chief, Engineering and Manufacturing Branch, FAA Eastern Region may adjust the compliance time specified in this AD. NOTE: AVCO Lycoming Service Bulletin No. 433A also pertains to this subject. Amendment 39-3418 was effective February 26, 1979. This Amendment 39-3570 is effective September 26, 1979. ## Affected data sheets (15) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS 1E10](https://openairdocs.org/tcds/1E10): Lycoming Engines; names 65 of 89 models: IO-360-C1D6, AEIO-360-B1G6, HIO-360-B1B, IO-360-B2F6, HIO-360-C1B, AEIO-360-A1B6, AIO-360-A1B, IO-360-B2E… - [TCDS 1E4](https://openairdocs.org/tcds/1E4): Lycoming Engines; names 53 of 81 models: IO-540-L1A5D, IO-540-M2A5D, IO-540-B1C5, IO-540-K1J5D, IO-540-G1A5, AEIO-540-D4B5, IO-540-K1B5D, IO-540-C1B5… - [TCDS 1E12](https://openairdocs.org/tcds/1E12): Lycoming Engines; names 28 of 32 models: AEIO-320-E1B, AIO-320-C1B, AIO-320-A1A, IO-320-B1C, IO-320-F1A, LIO-320-B1A, IO-320-B1D, AIO-320-A2B… - [TCDS E14EA](https://openairdocs.org/tcds/E14EA): Lycoming Engines; names 21 of 40 models: TIO-540-G1A, LTIO-540-N2BD, TIO-540-A1A, TIO-540-A2A, TIO-540-C1A, LTIO-540-F2BD, TIO-540-J2BD, TIO-540-A2C… - [TCDS 1E15](https://openairdocs.org/tcds/1E15): Textron Lycoming Subsidiary of Textron Inc.; names 11 of 12 models: IO-720-B1A, IO-720-D1CD, IO-720-A1A, IO-720-B1B, IO-720-D1BD, IO-720-C1BD, IO-720-A1BD, IO-720-A1B… - [TCDS 1E7](https://openairdocs.org/tcds/1E7): Lycoming Engines; names 8 of 8 models: IGSO-540-A1F, IGSO-540-B1A, IGSO-540-A1H, IGSO-540-A1C, IGSO-540-A1A, IGSO-540-B1C, IGSO-540-A1D, IGSO-540-A1E - [TCDS E-284](https://openairdocs.org/tcds/E-284): Lycoming Engines; names 7 of 23 models: IGSO-480-A1A6 (O-480-3), IGSO-480-A1B6, IGSO-480-A1C6, IGSO-480-A1F6, IGSO-480-A1E6, IGSO-480-A1G6, IGSO-480-A1D6 - [TCDS 1E11](https://openairdocs.org/tcds/1E11): Lycoming Engines; names 6 of 6 models: IGO-540-B1B, IGO-540-B1A, IGO-540-B1C, IGO-540-A1A, IGO-540-A1C, IGO-540-A1B - [TCDS E19EA](https://openairdocs.org/tcds/E19EA): Lycoming Engines; names 6 of 6 models: TIGO-541-C1A, TIGO-541-G1AD, TIGO-541-D1B, TIGO-541-E1A, TIGO-541-B1A, TIGO-541-D1A - [TCDS E10EA](https://openairdocs.org/tcds/E10EA): Lycoming Engines; names 5 of 5 models: TIO-541-E1A4, TIO-541-E1B4, TIO-541-E1C4, TIO-541-A1A, TIO-541-E1D4 - [TCDS E16EA](https://openairdocs.org/tcds/E16EA): Lycoming Engines; names 3 of 4 models: TIO-360-A1B, TIO-360-A1A, TIO-360-A3B6 - [TCDS E-275](https://openairdocs.org/tcds/E-275): Lycoming Engines; names 2 of 33 models: IGO-480-A1B6, IGO-480-A1A6 - [TCDS 1E1](https://openairdocs.org/tcds/1E1): Lycoming Engines; names 1 of 4 models: IVO-360-A1A - [TCDS 1E14](https://openairdocs.org/tcds/1E14): Lycoming Engines; names 1 of 2 models: TIVO-540-A2A - [TCDS E11EA](https://openairdocs.org/tcds/E11EA): Lycoming Engines; names 1 of 1 models: IVO-540-A1A ## 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: 23,938 (0 by airframe model, 23,938 by engine model) - Makers: Piper 9,585, Cessna 3,346, Mooney 2,226, Beech 773, Bellanca 689, Aviat 334, Rockwell International 315, Robinson Helicopter 300, American Champion 281, Maule 262 Models with the most aircraft: - [Lycoming I0360 series](https://openairdocs.org/engine/lycoming-i0360-series): 6,174 aircraft (engine model) - [Lycoming TI0-540 series](https://openairdocs.org/engine/lycoming-ti0-540-series): 4,886 aircraft (engine model) - [Lycoming IO-540 series](https://openairdocs.org/engine/lycoming-io-540-series): 4,219 aircraft (engine model) - [Lycoming IO-320 series](https://openairdocs.org/engine/lycoming-io-320-series): 1,707 aircraft (engine model) - [Lycoming IO-360-B4A](https://openairdocs.org/engine/lycoming-io-360-b4a): 985 aircraft (engine model) - [Lycoming AEIO-360 series](https://openairdocs.org/engine/lycoming-aeio-360-series): 882 aircraft (engine model) - [Lycoming IO-360-A1B6D](https://openairdocs.org/engine/lycoming-io-360-a1b6d): 844 aircraft (engine model) - [Lycoming AEIO-540 series](https://openairdocs.org/engine/lycoming-aeio-540-series): 433 aircraft (engine model) - [Lycoming HIO-360 series](https://openairdocs.org/engine/lycoming-hio-360-series): 336 aircraft (engine model) - [Lycoming TI0-541 series](https://openairdocs.org/engine/lycoming-ti0-541-series): 271 aircraft (engine model) - [Lycoming IO-540-D4A5](https://openairdocs.org/engine/lycoming-io-540-d4a5): 237 aircraft (engine model) - [Lycoming IO-360 series](https://openairdocs.org/engine/lycoming-io-360-series): 217 aircraft (engine model) - [Lycoming IO-360-A1A](https://openairdocs.org/engine/lycoming-io-360-a1a): 196 aircraft (engine model) - [Lycoming IO-360-A1D6](https://openairdocs.org/engine/lycoming-io-360-a1d6): 192 aircraft (engine model) - [Lycoming TIO-540 series](https://openairdocs.org/engine/lycoming-tio-540-series): 190 aircraft (engine model) - [Lycoming IO-540-C4B5](https://openairdocs.org/engine/lycoming-io-540-c4b5): 179 aircraft (engine model) - [Lycoming I0-360-B1E](https://openairdocs.org/engine/lycoming-i0-360-b1e): 141 aircraft (engine model) - [Lycoming IO-360-A1B6](https://openairdocs.org/engine/lycoming-io-360-a1b6): 141 aircraft (engine model) - [Lycoming IO-720 series](https://openairdocs.org/engine/lycoming-io-720-series): 120 aircraft (engine model) - [Lycoming IO-360-A3B6D](https://openairdocs.org/engine/lycoming-io-360-a3b6d): 74 aircraft (engine model) All 141 models: https://openairdocs.org/ad/79-04-05/models.md Every aircraft: https://openairdocs.org/ad/79-04-05/aircraft.md Its text cites no advisory circulars or STCs. ## NTSB investigations that cite this AD (1) From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. - [NTSB CHI80FEI42](https://openairdocs.org/ntsb/CHI80FEI42), Sep 10, 1980: Piper PA-24 (N9411P), Sandusky, OH, substantial damage --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.