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79-04-05: Regulator Diaphragm Stem Assembly

FAA order 79-04-05 is an airworthiness directive in force since September 26, 1979. The FAA's subject line: Regulator Diaphragm Stem Assembly. It names the Lycoming AEIO-320-D1B, Lycoming AEIO-320-E1B, Lycoming AEIO-320-E2B, Lycoming AEIO-320 series, Lycoming AEIO-360-A1A, Lycoming AEIO-360-A1B, Lycoming AEIO-360-A1B6, Lycoming AEIO-360-A1D, Lycoming AEIO-360-A2C, Lycoming AEIO-360-B1B, Lycoming AEIO-360-B1F, Lycoming AEIO-360-B1G6, Lycoming AEIO-360-B2F, Lycoming AEIO-360-B4A, Lycoming AEIO-360-H1A, Lycoming AEIO-360 series, Lycoming AEIO-540-D4A5, Lycoming AEIO-540-D4B5, Lycoming AEIO-540 series, Lycoming HIO-360-A1A, Lycoming HIO-360-B1A, Lycoming HIO-360-B1B, Lycoming HIO-360-C1A, Lycoming HIO-360-C1B, Lycoming HIO-360-D1A, Lycoming HIO-360-E1AD, Lycoming HIO-540-A1A, Lycoming IGO-480, Lycoming IGO-540-A1C, Lycoming IGO-540-B1A, Lycoming IGSO-480-A1E6, Lycoming IGSO-540-B1A, Lycoming IO-320-A1A, Lycoming IO-320-B1A, Lycoming IO-320-B1C, Lycoming IO-320-B2A, Lycoming IO-320-C1A, Lycoming IO-320-D1A, Lycoming IO-320-D1B, Lycoming IO-320-E1A, Lycoming IO-320-E1B, Lycoming IO-320-E2A, Lycoming IO-320-E2B, Lycoming IO-320 series, Lycoming IO-360-A1A, Lycoming IO-360-A1B, Lycoming IO-360-A1B6, Lycoming IO-360-A1B6D, Lycoming IO-360-A1D, Lycoming IO-360-A1D6, Lycoming IO-360-A2B, Lycoming IO-360-A3B6D, Lycoming IO-360-B1A, Lycoming IO-360-B1B, Lycoming IO-360-B1C, Lycoming IO-360-B1D, Lycoming IO-360-B1E, Lycoming IO-360-B1F, Lycoming IO-360-B1F6, Lycoming IO-360-B2E, Lycoming IO-360-B2F, Lycoming IO-360-B4A, Lycoming IO-360-C1A, Lycoming IO-360-C1C, Lycoming IO-360-C1C6, Lycoming IO-360-C1D6, Lycoming IO-360-C1E6, Lycoming IO-360-C1F, Lycoming IO-360-D1A, Lycoming IO-360-E1A, Lycoming IO-360-F1A, Lycoming IO-360 series, Lycoming IO-540-C1B5, Lycoming IO-540-C2C, Lycoming IO-540-C4B5, Lycoming IO-540-D4A5, Lycoming IO-540-D4B5, Lycoming IO-540-D4C5, Lycoming IO-540-E1A5, Lycoming IO-540-E1B5, Lycoming IO-540-G1A5, Lycoming IO-540-G1B5, Lycoming IO-540-G1C5, Lycoming IO-540-G1D5, Lycoming IO-540-J4A5, Lycoming IO-540-K1A5, Lycoming IO-540-K1A5D, Lycoming IO-540-K1B5, Lycoming IO-540-K1C5, Lycoming IO-540-K1E5, Lycoming IO-540-K1F5, Lycoming IO-540-K1G5, Lycoming IO-540-K1G5D, Lycoming IO-540-K1H5, Lycoming IO-540-K1J5, Lycoming IO-540-N1A5, Lycoming IO-540-P1A5, Lycoming IO-540-R1A5, Lycoming IO-540-S1A5, Lycoming IO-540 series, Lycoming IO-540-T4A5D, Lycoming IO-540-V4A5D, Lycoming IO-720, Lycoming IO-720-A1B, Lycoming IO-720-C1B, Lycoming IO-720-D1CD, Lycoming IVO-360-A1A, Lycoming LIO-320-C1A, Lycoming LIO-360-C1E6, Lycoming LTIO-540-F2BD, Lycoming LTIO-540-J2BD, Lycoming TIGO-541-E1A, Lycoming TIGO-541 series, Lycoming TIO-360 series, Lycoming TIO-540-A1A, Lycoming TIO-540-A2B, Lycoming TIO-540-A2C, Lycoming TIO-540-C1A, Lycoming TIO-540-F2BD, Lycoming TIO-540-J2BD, Lycoming TIO-540-K1AD, Lycoming TIO-540-R2AD, Lycoming TIO-540-S1AD, Lycoming TIO-540 series, Lycoming TIO-541-A1A, Lycoming TIO-541-E1C4, Lycoming TIO-541 series engines: about 25,681 aircraft on the U.S. register today across them, though an order usually covers particular versions or serial numbers rather than every one. System: engine.

What it applies to as the FAA lists it

Kind of product: Engine
Makes: Lycoming Engines; Textron Lycoming, AVCO Corporation
Models: 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, AEIO-360-A2C, AEIO-360-B1B, AEIO-360-B1D, AEIO-360-B1F, AEIO-360-B1F6, AEIO-360-B1G6, AEIO-360-B2F, AEIO-360-B2F6, AEIO-360-B4A, AEIO-360-H1A, AEIO-540-D4A5, AEIO-540-D4B5, AEIO-540-D4C5, AIO-320-A1A, AIO-320-A1B, AIO-320-A2A, AIO-320-A2B, AIO-320-B1B, AIO-320-C1B, AIO-360-A1A, AIO-360-A1B, AIO-360-A2A, AIO-360-A2B, AIO-360-B1B, HIO-360-A1A, HIO-360-B1A, HIO-360-B1B, HIO-360-C1A, HIO-360-C1B, HIO-360-D1A, HIO-360-E1AD,...
Engine series: Lycoming AEIO-320-D1B 2 aircraft
Lycoming AEIO-320-E1B 6 aircraft
Lycoming AEIO-320-E2B 6 aircraft
Lycoming AEIO-320 series 74 aircraft
Lycoming AEIO-360-A1A 3 aircraft
Lycoming AEIO-360-A1B 1 aircraft
Lycoming AEIO-360-A1B6 11 aircraft
Lycoming AEIO-360-A1D 15 aircraft
Lycoming AEIO-360-A2C 1 aircraft
Lycoming AEIO-360-B1B 2 aircraft
Lycoming AEIO-360-B1F 4 aircraft
Lycoming AEIO-360-B1G6 22 aircraft
Lycoming AEIO-360-B2F 7 aircraft
Lycoming AEIO-360-B4A 5 aircraft
Lycoming AEIO-360-H1A 8 aircraft
Lycoming AEIO-360 series 883 aircraft
Lycoming AEIO-540-D4A5 55 aircraft
Lycoming AEIO-540-D4B5 3 aircraft
Lycoming AEIO-540 series 434 aircraft
Lycoming HIO-360-A1A 5 aircraft
Lycoming HIO-360-B1A 16 aircraft
Lycoming HIO-360-B1B 2 aircraft
Lycoming HIO-360-C1A 6 aircraft
Lycoming HIO-360-C1B 1 aircraft
Lycoming HIO-360-D1A 41 aircraft
Lycoming HIO-360-E1AD 9 aircraft
Lycoming HIO-540-A1A 2 aircraft
Lycoming IGO-480 1 aircraft
Lycoming IGO-540-A1C 1 aircraft
Lycoming IGO-540-B1A 9 aircraft
Lycoming IGSO-480-A1E6 1 aircraft
Lycoming IGSO-540-B1A 48 aircraft
Lycoming IO-320-A1A 2 aircraft
Lycoming IO-320-B1A 55 aircraft
Lycoming IO-320-B1C 2 aircraft
Lycoming IO-320-B2A 1 aircraft
Lycoming IO-320-C1A 7 aircraft
Lycoming IO-320-D1A 57 aircraft
Lycoming IO-320-D1B 6 aircraft
Lycoming IO-320-E1A 3 aircraft
Lycoming IO-320-E1B 3 aircraft
Lycoming IO-320-E2A 11 aircraft
Lycoming IO-320-E2B 4 aircraft
Lycoming IO-320 series 1,707 aircraft
Lycoming IO-360-A1A 195 aircraft
Lycoming IO-360-A1B 52 aircraft
Lycoming IO-360-A1B6 141 aircraft
Lycoming IO-360-A1B6D 844 aircraft
Lycoming IO-360-A1D 15 aircraft
Lycoming IO-360-A1D6 191 aircraft
Lycoming IO-360-A2B 2 aircraft
Lycoming IO-360-A3B6D 74 aircraft
Lycoming IO-360-B1A 49 aircraft
Lycoming IO-360-B1B 67 aircraft
Lycoming IO-360-B1C 6 aircraft
Lycoming IO-360-B1D 2 aircraft
Lycoming IO-360-B1E 184 aircraft
Lycoming IO-360-B1F 8 aircraft
Lycoming IO-360-B1F6 3 aircraft
Lycoming IO-360-B2E 3 aircraft
Lycoming IO-360-B2F 1 aircraft
Lycoming IO-360-B4A 969 aircraft
Lycoming IO-360-C1A 7 aircraft
Lycoming IO-360-C1C 45 aircraft
Lycoming IO-360-C1C6 64 aircraft
Lycoming IO-360-C1D6 14 aircraft
Lycoming IO-360-C1E6 43 aircraft
Lycoming IO-360-C1F 2 aircraft
Lycoming IO-360-D1A 4 aircraft
Lycoming IO-360-E1A 3 aircraft
Lycoming IO-360-F1A 3 aircraft
Lycoming IO-360 series 8,560 aircraft
Lycoming IO-540-C1B5 9 aircraft
Lycoming IO-540-C2C 1 aircraft
Lycoming IO-540-C4B5 179 aircraft
Lycoming IO-540-D4A5 236 aircraft
Lycoming IO-540-D4B5 13 aircraft
Lycoming IO-540-D4C5 1 aircraft
Lycoming IO-540-E1A5 4 aircraft
Lycoming IO-540-E1B5 4 aircraft
Lycoming IO-540-G1A5 7 aircraft
Lycoming IO-540-G1B5 3 aircraft
Lycoming IO-540-G1C5 3 aircraft
Lycoming IO-540-G1D5 26 aircraft
Lycoming IO-540-J4A5 9 aircraft
Lycoming IO-540-K1A5 44 aircraft
Lycoming IO-540-K1A5D 3 aircraft
Lycoming IO-540-K1B5 17 aircraft
Lycoming IO-540-K1C5 1 aircraft
Lycoming IO-540-K1E5 5 aircraft
Lycoming IO-540-K1F5 2 aircraft
Lycoming IO-540-K1G5 48 aircraft
Lycoming IO-540-K1G5D 52 aircraft
Lycoming IO-540-K1H5 2 aircraft
Lycoming IO-540-K1J5 10 aircraft
Lycoming IO-540-N1A5 7 aircraft
Lycoming IO-540-P1A5 4 aircraft
Lycoming IO-540-R1A5 1 aircraft
Lycoming IO-540-S1A5 10 aircraft
Lycoming IO-540 series 4,218 aircraft
Lycoming IO-540-T4A5D 4 aircraft
Lycoming IO-540-V4A5D 39 aircraft
Lycoming IO-720 119 aircraft
Lycoming IO-720-A1B 8 aircraft
Lycoming IO-720-C1B 1 aircraft
Lycoming IO-720-D1CD 1 aircraft
Lycoming IVO-360-A1A 2 aircraft
Lycoming LIO-320-C1A 1 aircraft
Lycoming LIO-360-C1E6 6 aircraft
Lycoming LTIO-540-F2BD 1 aircraft
Lycoming LTIO-540-J2BD 5 aircraft
Lycoming TIGO-541-E1A 1 aircraft
Lycoming TIGO-541 series 37 aircraft
Lycoming TIO-360 series 15 aircraft
Lycoming TIO-540-A1A 5 aircraft
Lycoming TIO-540-A2B 4 aircraft
Lycoming TIO-540-A2C 6 aircraft
Lycoming TIO-540-C1A 9 aircraft
Lycoming TIO-540-F2BD 4 aircraft
Lycoming TIO-540-J2BD 24 aircraft
Lycoming TIO-540-K1AD 1 aircraft
Lycoming TIO-540-R2AD 1 aircraft
Lycoming TIO-540-S1AD 13 aircraft
Lycoming TIO-540 series 5,079 aircraft
Lycoming TIO-541-A1A 1 aircraft
Lycoming TIO-541-E1C4 9 aircraft
Lycoming TIO-541 series 273 aircraft

Dates and paperwork

In force since: September 26, 1979
Docket: Unknown
Status: Current
The FAA's document: Read the order on the FAA's site

The order itself the regulatory text, as published

Show the full text (2,522 characters)

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.

Source: FAA Dynamic Regulatory System, airworthiness directives. The FAA's document is the authority; the register counts are this site's, from the FAA register of October 5, 2026. Connections as data: /graph/directive/79-04-05.json · aircraft systems.