# AD 90-04-06 R1: Propeller Governor External Oil Line - Type: Airworthiness directive - Status: Current - Products: Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, 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AEIO-360-A1B, AEIO-360-A1B6, AEIO-360-A1C, AEIO-360-A1D, AEIO-360-A1E and 418 more - Effective: May 28, 1991 - Superseded by: Nothing supersedes this AD - Product type: Engine - Amendment: 39-6427 - Docket: 89-ANE-21 - Registered aircraft: 68,359 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/D17C07A9D76E6AAA8625684F006E5ADC.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/90-04-06-R1 ## The airworthiness directive 90-04-06 R1 TEXTRON LYCOMING: Amendment 39-6427 as revised by Amendment 39-6915. Docket No. 89-ANE-21. Applicability: All Textron Lycoming four cylinder piston engines equipped with a rear mounted propeller governor and external oil line, manufactured prior to January 1, 1990. Compliance: Required as indicated, unless already accomplished. To prevent oil line fracture and loss of engine oil, accomplish the following: (a) Within the next 25 hours time in service or whenever the propeller governor oil line is removed, whichever occurs first, accomplish the following: (1) Inspect the propeller governor external oil line for abrasions, cracks, and oil leaks along the length of the line and at the end attachment fittings. Inspect to determine that the two cushion type support clamps or clips are properly installed as shown in Figure 1 of Appendix 1 to this AD, and assure that sufficient clearances exist between the oil line and adjacent components.(2) If any leaks, chafing, or interference condition exists or if the two support clamps or clips are not properly installed, replace the governor oil line and its attachment end fittings with new parts even though the parts show no visible damage. Refer to Figure 1 in Appendix 1 to this AD, for parts identification, line routing, and location of support clamps or clips. The fittings in the engine case and governor must be replaced if they are damaged or are made of aluminum. (b) At the next engine overhaul or anytime the governor oil line is removed for any reason, whichever occurs first, but no later than May 1, 1992, remove any governor oil line assembly having integral aluminum connecting nuts and reinstall an oil line assembly with corresponding steel connecting nuts. Replace any engine case/governor aluminum fittings with corresponding steel fittings as shown in Figure 1 of Appendix 1 to this AD. NOTE: The attachment nuts are components of the governor oil line tube assembly and have been changed by Textron Lycoming from aluminum to steel without changing the oil line part number. Aluminum nuts may be identified by their blue colored anodized surface. The attachment nuts as well as the elbow/nipple end fittings may also be identified by using a magnet to differentiate aluminum from steel. (c) An optional method of compliance with paragraph (a)(2) and (b) is the installation of steel fittings and a fire resistant flexible hose assembly which meets the standards in FAA Technical Standard Order TSO- C53a Type D, and is installed in accordance with Appendix 2 of this AD. NOTE: Further guidance pertaining to installation can be obtained from FAA Advisory Circular 43.13-1A, Chapter 10, Maintenance Standards. (d) Aircraft may be ferried in accordance with the provisions of FAR 21.197 and 21.199 to a base where the AD can be accomplished. (e) Upon submission of substantiating data by an owner or operator through an FAA Inspector(maintenance, avionics, or operations, as appropriate), an alternate method of compliance with the requirements of this AD or adjustments to the compliance times specified in this AD, may be approved by the Manager, New York Aircraft Certification Office, Engine and Propeller Directorate, Aircraft Certification Service, FAA, 181 South Franklin Avenue, Room 202, Valley Stream, New York 11581. This amendment revises Amendment 39-6427 (55 FR 3577, February 2, 1990) AD 90-04-06. This amendment (39-6915, AD 90-04-06 R1) becomes effective on May 28, 1991. AD 90-04-06 R1 APPENDIX 2 If -5 (5/16") fittings have been installed on some standard cylinder flange crankcase model engines, the propeller governor drive fitting and front crankcase fitting must be changed to the appropriate steel fitting to accommodate the new -6 (3/8") line. When re-installing new stainless steel tube assembly, appropriate -5 steel fittings must be re-installed. CAUTION IT IS MANDATORY THAT THIS FLEXIBLE HOSE BE REPLACED AT EACH OVERHAUL. When this engine modification is accomplished, Textron Lycoming recommends that a copy of the approved FAA Form 337 - plus the proper logbook entry become a permanent part of the aircraft records. Installation is as follows: a. Determine proper hose length as required for your particular installation. b. No sharp bends are permissible. Ascertain that no "kinks" exist while routing and clamping hose. c. Hose must not be routed near a heat source, such as any portion of the exhaust system. d. Hose is to be clamp supported to the engine (not to an airframe component) at a minimum of two locations. e. No clamping to cylinder head drain back tubes is allowed. f. After installation is complete, ensure that hose is not pinched. Make certain that engine motion during startup and shutdown does not pull or pinch the hose. ## Affected data sheets (32) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS 1E10](https://openairdocs.org/tcds/1E10): Lycoming Engines; names 74 of 89 models: IO-360-C1D6, AEIO-360-B1G6, HIO-360-B1B, IO-360-B2F6, HIO-360-C1B, AEIO-360-A1B6, HIO-360-E1BD, IO-360-K2A… - [TCDS E-286](https://openairdocs.org/tcds/E-286): Lycoming Engines; names 65 of 72 models: LO-360-A1H6, O-360-C1C, O-360-C1A, O-360-E2AD, LO-360-E1BD, O-360-E2BD, O-360-B1A, O-360-A1A… - [TCDS E-274](https://openairdocs.org/tcds/E-274): Lycoming Engines; names 58 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-223](https://openairdocs.org/tcds/E-223): Lycoming Engines; names 43 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-275](https://openairdocs.org/tcds/E-275): Lycoming Engines; names 33 of 33 models: GO-480-F3A6, IGO-480-A1B6, GO-480-C1B6, GO-480-G1J6, GO-480-C2C6, GO-480-F1A6, GO-480-G2F6, GO-480-B1C… - [TCDS 1E12](https://openairdocs.org/tcds/1E12): Lycoming Engines; names 32 of 32 models: AEIO-320-E1B, AEIO-320-D2B, AIO-320-C1B, AIO-320-A1A, IO-320-B1C, IO-320-C1B, IO-320-F1A, LIO-320-B1A… - [TCDS E-284](https://openairdocs.org/tcds/E-284): Lycoming Engines; names 23 of 23 models: GSO-480-B1B3, IGSO-480-A1A6 (O-480-3), IGSO-480-A1B6, GSO-480-B2H6, GSO-480-B1F6, GSO-480-B1E6, GSO-480-B1C6, IGSO-480-A1C6… - [TCDS E-228](https://openairdocs.org/tcds/E-228): Lycoming Engines; names 20 of 20 models: O-435-A, O-435-A2, O-435, GO-435-C2B1, O-435-C2 (O-435-13), O-435-K, GO-435-C2A, GO-435-C2E… - [TCDS 1E13](https://openairdocs.org/tcds/1E13): Lycoming Engines; names 11 of 11 models: TVO-435-D1B, TVO-435-A1A, TVO-435-E1A, O-435-25, TVO-435-C1A, TVO-435-B1B, TVO-435-B1A (O-435-25A), TVO-435-G1B… - [TCDS E-229](https://openairdocs.org/tcds/E-229): Lycoming Division AVCO Corporation; names 10 of 10 models: O-290-D2, O-290-D, O-290-B, O-290-A, O-290-CP, O-290-AP, O-290-D2A, O-290-C… - [TCDS TC 210](https://openairdocs.org/tcds/TC%20210): Textron Lycoming AVCO Corporation; names 8 of 8 models: GO-145-C3, O-145-B2, O-145-B1, O-145-C2, GO-145-C1, GO-145-C2, O-145-B3, O-145-C1 - [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 E26EA](https://openairdocs.org/tcds/E26EA): Lycoming Engines; names 6 of 6 models: TO-360-C1A6D, TO-360-A1A6D, LTO-360-A1A6D, LTO-360-E1A6D, TO-360-F1A6D, TO-360-E1A6D - [TCDS E-202](https://openairdocs.org/tcds/E-202): Textron Lycoming AVCO Corporation; names 5 of 5 models: R-680-E2, R-680-E1, R-680-E3A, R-680-E3B, R-680-E3 - [TCDS 1E1](https://openairdocs.org/tcds/1E1): Lycoming Engines; names 4 of 4 models: IVO-360-A1A, VO-360-A1A, VO-360-B1A, VO-360-A1B - [TCDS E16EA](https://openairdocs.org/tcds/E16EA): Lycoming Engines; names 4 of 4 models: TIO-360-A1B, TIO-360-A1A, TIO-360-C1A6D, TIO-360-A3B6 - [TCDS ATC 81](https://openairdocs.org/tcds/ATC%2081): Textron Lycoming AVCO Corporation; names 3 of 3 models: R-680-BA, R-680-B2, R-680-2 - [TCDS E-277](https://openairdocs.org/tcds/E-277): Lycoming Engines; names 3 of 3 models: O-340-A2A, O-340-B1A, O-340-A1A - [TCDS ATC 110](https://openairdocs.org/tcds/ATC%20110): Textron Lycoming AVCO Corporation; names 2 of 2 models: R-680-B5, R-680-5 - [TCDS ATC 111](https://openairdocs.org/tcds/ATC%20111): Textron Lycoming AVCO Corporation; names 2 of 2 models: R-680-B6, R-680-6 - [TCDS E-276](https://openairdocs.org/tcds/E-276): Lycoming Engines; names 2 of 2 models: GSO-435-B2, GSO-435-B - [TCDS TC 108](https://openairdocs.org/tcds/TC%20108): Textron Lycoming AVCO Corporation; names 2 of 2 models: R-680-4, R-680-B4 Series - [TCDS TC 199](https://openairdocs.org/tcds/TC%20199): Textron Lycoming AVCO Corporation; names 2 of 2 models: O-145-A1, O-145-A2 - [TCDS TC 227](https://openairdocs.org/tcds/TC%20227): Textron Lycoming AVCO Corporation; names 2 of 2 models: O-350-A, O-350 - [TCDS ATC 182](https://openairdocs.org/tcds/ATC%20182): Textron Lycoming AVCO Corporation; names 1 of 1 models: R-530-D1 - [TCDS ATC 183](https://openairdocs.org/tcds/ATC%20183): Textron Lycoming AVCO Corporation; names 1 of 1 models: R-530-D2 - [TCDS ATC 42 Textron Lycoming](https://openairdocs.org/tcds/ATC%2042%20Textron%20Lycoming): Textron Lycoming AVCO Corporation; names 1 of 1 models: R-680 - [TCDS TC 172](https://openairdocs.org/tcds/TC%20172): Textron Lycoming AVCO Corporation; names 1 of 1 models: R-680-D5 - [TCDS TC 173](https://openairdocs.org/tcds/TC%20173): Textron Lycoming AVCO Corporation; names 1 of 1 models: R-680-D6 - [TCDS TC 475](https://openairdocs.org/tcds/TC%20475): Textron Lycoming AVCO Corporation; names 1 of 1 models: P220 - [TCDS TC 5E-12](https://openairdocs.org/tcds/TC%205E-12): Textron Lycoming AVCO Corporation; names 1 of 1 models: Military O-435-2-M1 - [TCDS TC 729](https://openairdocs.org/tcds/TC%20729): Textron Lycoming AVCO Corporation; names 1 of 1 models: F220 ## 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: 68,359 (0 by airframe model, 68,359 by engine model) - Makers: Piper 26,943, Cessna 15,000, Mooney 3,644, Beech 1,888, Bellanca 1,676, Grumman American Avn. 1,526, Champion 830, American Champion 758, Aviat 615, Robinson Helicopter 580 Models with the most aircraft: - [Lycoming 0-320 series](https://openairdocs.org/engine/lycoming-0-320-series): 27,061 aircraft (engine model) - [Lycoming O&VO-360 series](https://openairdocs.org/engine/lycoming-o-vo-360-series): 11,930 aircraft (engine model) - [Lycoming I0360 series](https://openairdocs.org/engine/lycoming-i0360-series): 6,173 aircraft (engine model) - [Lycoming 0-235 series](https://openairdocs.org/engine/lycoming-0-235-series): 6,133 aircraft (engine model) - [Lycoming 0-290 series](https://openairdocs.org/engine/lycoming-0-290-series): 2,126 aircraft (engine model) - [Lycoming IO-320 series](https://openairdocs.org/engine/lycoming-io-320-series): 1,707 aircraft (engine model) - [Lycoming O-360 series](https://openairdocs.org/engine/lycoming-o-360-series): 1,023 aircraft (engine model) - [Lycoming IO-360-B4A](https://openairdocs.org/engine/lycoming-io-360-b4a): 985 aircraft (engine model) - [Lycoming 0-360-A1D](https://openairdocs.org/engine/lycoming-0-360-a1d): 968 aircraft (engine model) - [Lycoming AEIO-360 series](https://openairdocs.org/engine/lycoming-aeio-360-series): 881 aircraft (engine model) - [Lycoming IO-360-A1B6D](https://openairdocs.org/engine/lycoming-io-360-a1b6d): 844 aircraft (engine model) - [Lycoming O-360-A1A](https://openairdocs.org/engine/lycoming-o-360-a1a): 601 aircraft (engine model) - [Lycoming 0-145B series](https://openairdocs.org/engine/lycoming-0-145b-series): 538 aircraft (engine model) - [Lycoming O-360-A4M](https://openairdocs.org/engine/lycoming-o-360-a4m): 418 aircraft (engine model) - [Lycoming HIO-360 series](https://openairdocs.org/engine/lycoming-hio-360-series): 336 aircraft (engine model) - [Lycoming O-320-E2D](https://openairdocs.org/engine/lycoming-o-320-e2d): 258 aircraft (engine model) - [Lycoming O-320 series](https://openairdocs.org/engine/lycoming-o-320-series): 256 aircraft (engine model) - [Lycoming GO-480 series](https://openairdocs.org/engine/lycoming-go-480-series): 246 aircraft (engine model) - [Lycoming R680E series](https://openairdocs.org/engine/lycoming-r680e-series): 225 aircraft (engine model) - [Lycoming R680](https://openairdocs.org/engine/lycoming-r680): 218 aircraft (engine model) All 265 models: https://openairdocs.org/ad/90-04-06-R1/models.md Every aircraft: https://openairdocs.org/ad/90-04-06-R1/aircraft.md ## Related documents - [AC 43.13-1B CHG 1 Ed Update](https://openairdocs.org/ac/43.13-1): Acceptable Methods, Techniques, and Practices—Aircraft Inspection and Repair. Cited as AC 43.13-1A in the AD's requirements ## NTSB investigations that cite this AD (4) From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. - [NTSB CEN14LA081](https://openairdocs.org/ntsb/CEN14LA081), Dec 10, 2013: Rockwell International 112 (N1203J), Hammond, LA, substantial damage. Probable cause: The total loss of engine power due to oil starvation because of a fractured governor oil line, which resulted from the improper installation of the governor oil line assembly during the last oil line… - [NTSB ATL95FA087](https://openairdocs.org/ntsb/ATL95FA087), Apr 18, 1995: Duke, Clarence E. Lancair 360 (N360BJ), Hampton, GA, destroyed, 1 fatal. Probable cause: The loss of engine power for undetermined reasons. A factor in the accident was the pilot's lack of recent flying experience. - [NTSB FTW94LA130](https://openairdocs.org/ntsb/FTW94LA130), Apr 18, 1994: Beech 95 (N3051), Greeley, CO, substantial damage. Probable cause: A FAILURE OF THE RIGHT ENGINE PROPELLER GOVERNOR OIL LINE WHICH WAS THE INCORRECT LINE AND IMPROPERLY INSTALLED BY MAINTENANCE PERSONNEL. - [NTSB FTW90FA077](https://openairdocs.org/ntsb/FTW90FA077), Mar 4, 1990: Piper PA-24-180 (N5354P), Fabens, TX, destroyed, 2 fatal. Probable cause: THE PILOT'S FAILURE TO MAINTAIN ADEQUATE AIRSPEED DURING A TAKEOFF WITH LESS THAN FULL POWER RESULTING IN A STALL. CONTRIBUTING FACTORS WERE THE PILOT'S FAILURE TO LEAN THE MIXTURE TO COMPENSATE FOR… --- 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.