# AD 2004-10-14: Crankshaft gear

- 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 633 more
- Effective: June 25, 2004
- Published: May 21, 2004, 69 FR 29210–29212
- Issued: May 12, 2004
- Issued as: Final rule
- Supersedes: [AD 91-14-22](https://openairdocs.org/ad/91-14-22)
- Superseded by: Nothing supersedes this AD
- Product type: Engine
- Amendment: 39-13644
- Docket: 89-ANE-10-AD
- Registered aircraft: 92,250 may be affected, by airframe or engine model (OpenAirDocs)
- Official PDF: https://openairdocs.org/files/sha256/95/29/9529c5517bdd333ccd1743a2025cfb7407f55c1e6917c740081cfdad5988abfd (from https://www.govinfo.gov/content/pkg/FR-2004-05-21/pdf/04-11406.pdf)
- Federal Register: https://www.federalregister.gov/documents/2004/05/21/04-11406/airworthiness-directives-lycoming-engines-formerly-textron-lycoming-direct-drive-reciprocating
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/9FA5E5F8683A0A4686256E9B004BC295.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/2004-10-14

## Summary

The FAA is adopting a new airworthiness directive (AD) that supersedes an existing AD, for Lycoming Engines (formerly Textron Lycoming), direct-drive reciprocating engines (except O-145, O-320H, O-360E, LO-360E, LTO-360E, O-435, and TIO-541 series engines). That AD currently requires inspection of the crankshaft gear installation and rework or replacement of the gears where necessary after a propeller strike, sudden stoppage, at overhaul, or whenever gear train repair is required. This AD requires the same actions but makes the correction that the existing gear retaining bolt and lockplate be removed from service and new hardware installed, and revises the definitions for sudden stoppage and propeller strike. This AD results from a change to the definition of a propeller strike or sudden stoppage. We are issuing this AD to prevent loosening or failure of the crankshaft gear retaining bolt, which may cause sudden engine failure.

## The airworthiness directive

Accordingly, under the authority delegated to me by the Administrator, the Federal Aviation Administration amends 14 CFR part 39 as follows:

1. The authority citation for part 39 continues to read as follows:

2. The FAA amends § 39.13 by removing Amendment 39-6916 (56 FR 33205, July 19, 1991), and by adding the following new airworthiness directive (AD):

2004-10-14 Lycoming Engines (formerly Textron Lycoming): Amendment 39-13644. Docket No. 89-ANE-10-AD. Supersedes AD 91-14-22, Amendment 39-6916.

### (a) Effective Date

  (a) This AD becomes effective June 25, 2004.

### (b) Affected ADs

  (b) This AD supersedes AD 91-14-22.

### (c) Applicability

  (c) This AD applies to Lycoming Engines (formerly Textron Lycoming), direct-drive reciprocating engines (except O-145, O-320H, O-360E, LO-360E, LTO-360E, O-435, and TIO-541 series engines).

### (d) Unsafe Condition

  (d) This AD results from a change to the definition of a propeller strike or sudden stoppage. The actions specified in this AD are intended to prevent loosening or failure of the crankshaft gear retaining bolt, which may cause sudden engine failure.

### (e) Compliance

  (e) Compliance with this AD is required as indicated before further flight if the engine has experienced a propeller strike as defined in paragraphs (i) and (j) of this AD, unless already done.

  (f) Inspect, and if necessary repair, the crankshaft counter bored recess, the alignment dowel, the bolt hole threads, and the crankshaft gear for wear, galling, corrosion, and fretting in accordance with steps 1 through 5 of Lycoming Mandatory Service Bulletin (MSB) No. 475C, dated January 30, 2003.

  (g) Remove the existing gear retaining bolt and lockplate from service, and install a new bolt and lockplate, in accordance with steps 6 and 7 of Lycoming MSB No. 475C, dated January 30, 2003.

### (h) Prohibition of Retaining Bolt and Lockplate

  (h) Do not install the gear retaining bolt and lockplate that were removed in paragraph (g) of this AD, into any engine.

### (i) Definition of Propeller Strike

    (i) For the purposes of this AD, a propeller strike is defined as follows:

  (1) Any incident, whether or not the engine is operating, that requires repair to the propeller other than minor dressing of the blades.

  (2) Any incident during engine operation in which the propeller impacts a solid object that causes a drop in revolutions per minute (RPM) and also requires structural repair of the propeller (incidents requiring only paint touch-up are not included). This is not restricted to propeller strikes against the ground.

  (3) A sudden RPM drop while impacting water, tall grass, or similar yielding medium, where propeller damage is not normally incurred.

  (j) The preceding definitions include situations where an aircraft is stationary and the landing gear collapses causing one or more blades to be substantially bent, or where a hanger door (or other object) strikes the propeller blade. These cases should be handled as sudden stoppages because of potentially severe side loading on the crankshaft flange, front bearing, and seal.

### (k) Alternative Methods of Compliance

  (k) The Manager, New York Aircraft Certification Office, has the authority to approve alternative methods of compliance for this AD if requested using the procedures found in 14 CFR 39.19.

### (l) Material Incorporated by Reference

    (l) You must use Lycoming MSB No. 475C, dated January 30, 2003, to perform the inspections and repairs required by this AD. The Director of the Federal Register approved the incorporation by reference of this service bulletin in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. You can get a copy from Lycoming Engines, 652 Oliver Street, Williamsport, PA 17701, U.S.A; telephone (570) 323-6181; fax (570) 327-7101. You can review copies at the FAA, New England Region, Office of the Regional Counsel, 12 New England Executive Park, Burlington, MA; or at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, call 202-741-6030, or go to: http://www.archives.gov/federal_register/code_of_federal_regulations/ibr_locations.html.

### (m) Related Information

  (m) None.

## Rule preamble

### Dates

This AD becomes effective June 25, 2004. The Director of the Federal Register approved the incorporation by reference of certain publications listed in the regulations as of June 25, 2004.

### Addresses

You can get the service information identified in this AD from Lycoming Engines, 652 Oliver Street, Williamsport, PA 17701, U.S.A.; telephone (570) 323-6181; fax (570) 327-7101 or from the Lycoming Web site: www.lycoming.textron.com.main.jsp.

You may examine the AD docket at the FAA, New England Region, Office of the Regional Counsel, 12 New England Executive Park, Burlington, MA. You may examine the service information at the FAA, New England Region, Office of the Regional Counsel, 12 New England Executive Park, Burlington, MA; or at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, call 202-741-6030, or go to: http://www.archives.gov/federal_register/code_of_federal_regulations/ibr_locations.html.

### For further information contact

Norm Perenson, Aerospace Engineer, New York Aircraft Certification Office, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; telephone (516) 228-7337; fax (516) 794-5531.

### SUPPLEMENTARY INFORMATION

The FAA proposed to amend 14 CFR Part 39, by superseding an AD with a proposed airworthiness directive (AD). The proposed AD applies to Lycoming Engines direct-drive reciprocating engines (except O-145, O-320H, O-360E, LO-360E, LTO-360E, O-435, and TIO-541 series engines). We published the proposed AD in the Federal Register on March 25, 2003 (68 FR 14350). That action proposed to require inspection of the crankshaft gear installation and rework or replacement of the gears where necessary after a propeller strike, sudden stoppage, at overhaul, or whenever gear train repair is required. That action also proposed to revise the definitions for sudden stoppage and propeller strike.

### Comments

We provided the public the opportunity to participate in the development of this AD. We have considered the comments received.

### Provide a Trigger Level for Action

One commenter requests that the proposed AD should provide a trigger level to alert maintenance personnel of the need for action. The commenter states that this is required to avoid having maintenance personnel determine the need for action. Also, this would avoid miscommunication between the pilot and the maintenance personnel. The commenter also states that the proposed AD is too general for proper action in the field.

The FAA does not agree. Section 91.7(b) of the Code of Federal Regulations (14 CFR 91.7(b)) states: “The pilot in command of a civil aircraft is responsible for determining whether that aircraft is in condition for safe flight.” The pilot must advise the maintenance technician and inspector of the need to perform maintenance. It is also the responsibility of the maintenance technician and or inspector to advise the pilot when an unsafe condition is found during routine maintenance. The actions required by this AD, like many other situations in aviation, may require some judgment on the part of the pilot, maintenance technician, and or inspector, as well as good communication among all parties. Adding additional conditions will only require more judgment and more decisions by all parties involved.

### AD as Written Will Require Unneeded Inspections

One commenter states that the proposed AD would require unneeded inspections by “tying the hands” of knowledgeable mechanics. The commenter also states that the final determination regarding needed inspections should be made by the maintenance personnel in the field. The commenter further states that the mechanics are in the best position to evaluate the factors surrounding each incident, and to determine which engine components should be inspected.

The FAA does not agree. The wording in this AD is designed to assist the mechanics when deciding on what action to take in a given situation. Based on Lycoming's engine design knowledge and worldwide service experience, certain situations are known to have caused engine problems. This AD is not designed to “tie the hands of the mechanic”. The AD is intended to help the pilot in command and maintenance personnel make the best possible maintenance decision.

### Correction to the Compliance

As a correction to the compliance, we added paragraphs to require the existing gear retaining bolt and lockplate be removed from service and a new bolt and lockplate be installed, and to prohibit installation of the removed hardware into any engine. This correction places the AD in agreement with the referenced SB.

### Conclusion

We have carefully reviewed the available data, including the comments received, and determined that air safety and the public interest require adopting the AD with the changes described previously. We have determined that these changes will neither increase the economic burden on any operator nor increase the scope of the AD. The assigned paragraph letters in the regulatory section have been changed from what appeared in the proposal, as we are continuing our introduction of plain language into our documents.

### Regulatory Findings

We have determined that this AD will not have federalism implications under Executive Order 13132. This AD will not have a substantial direct effect on the States, on the relationship between the national government and the States, or on the distribution of power and responsibilities among the various levels of government.

For the reasons discussed above, I certify that this AD:

  (1) Is not a “significant regulatory action” under Executive Order 12866;

  (2) Is not a “significant rule” under DOT Regulatory Policies and Procedures (44 FR 11034, February 26, 1979); and

  (3) Will not have a significant economic impact, positive or negative, on a substantial number of small entities under the criteria of the Regulatory Flexibility Act.

We prepared a summary of the costs to comply with this AD and placed it in the AD Docket. You may get a copy of this summary by sending a request to us at the address listed under ADDRESSES. Include “AD Docket No. 89-ANE-10-AD” in your request.

## Affected data sheets (44) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 1E10](https://openairdocs.org/tcds/1E10): Lycoming Engines; names 85 of 89 models: IO-360-C1D6, AEIO-360-B1G6, HIO-360-B1B, IO-360-B2F6, HIO-360-C1B, AEIO-360-B1H, AEIO-360-A1B6, HIO-360-G1A…
- [TCDS 1E4](https://openairdocs.org/tcds/1E4): Lycoming Engines; names 79 of 81 models: IO-540-L1A5D, IO-540-L1C5, IO-540-M2A5D, AEIO-540-L1B5, IO-540-A1A5, IO-540-W1A5, IO-540-AA1B5, IO-540-B1C5…
- [TCDS E-286](https://openairdocs.org/tcds/E-286): Lycoming Engines; names 62 of 72 models: LO-360-A1H6, O-360-C1C, O-360-C1A, O-360-B1A, O-360-A1A, O-360-A1H6, O-360-A1G6, O-360-G1A6…
- [TCDS E-274](https://openairdocs.org/tcds/E-274): Lycoming Engines; names 54 of 60 models: O-320-D2G, O-320-E2G, O-320-D3G, O-320-C2B, O-320-E2B, O-320-E2C, O-320-D2H, O-320-B3B…
- [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 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 E14EA](https://openairdocs.org/tcds/E14EA): Lycoming Engines; names 40 of 40 models: TIO-540-G1A, LTIO-540-N2BD, TIO-540-A1A, TIO-540-AF1B, TIO-540-T2AD, TIO-540-A2A, TIO-540-C1A, TIO-540-V2AD…
- [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-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 1E15](https://openairdocs.org/tcds/1E15): Textron Lycoming Subsidiary of Textron Inc.; names 12 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 E-228](https://openairdocs.org/tcds/E-228): Lycoming Engines; names 11 of 20 models: GO-435-C2B1, GO-435-C2A, GO-435-C2E, GO-435-C2 (O-435-17), GO-435-C2B, GO-435-C2D, GO-435, GO-435-C2C…
- [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-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 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-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 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 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 E-256](https://openairdocs.org/tcds/E-256): Textron Lycoming AVCO Corporation; names 4 of 4 models: GSO-580-C, GSO-580, GSO-580-B, GSO-580-D
- [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 E26EA](https://openairdocs.org/tcds/E26EA): Lycoming Engines; names 4 of 6 models: TO-360-C1A6D, TO-360-A1A6D, LTO-360-A1A6D, TO-360-F1A6D
- [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 E-285](https://openairdocs.org/tcds/E-285): Lycoming Engines; names 3 of 3 models: SO-580-A1B, SO-580-A1A, VSO-580-A1A
- [TCDS TC 210](https://openairdocs.org/tcds/TC%20210): Textron Lycoming AVCO Corporation; names 3 of 8 models: GO-145-C3, GO-145-C1, GO-145-C2
- [TCDS 1E14](https://openairdocs.org/tcds/1E14): Lycoming Engines; names 2 of 2 models: TIVO-540-A2A, TVO-540-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 E00004NY](https://openairdocs.org/tcds/E00004NY): Lycoming Engines; names 2 of 3 models: IO-580-B1A, IO-580-A1A
- [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 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 E11EA](https://openairdocs.org/tcds/E11EA): Lycoming Engines; names 1 of 1 models: IVO-540-A1A
- [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: 92,250 (0 by airframe model, 92,250 by engine model)
- Makers: Piper 36,448, Cessna 20,603, Mooney 3,860, Robinson Helicopter 2,538, Beech 1,951, Textron 1,939, Bellanca 1,806, Grumman American Avn. 1,527, Aviat 1,056, American Champion 904

Models with the most aircraft:

- [Lycoming 0-320 series](https://openairdocs.org/engine/lycoming-0-320-series): 27,057 aircraft (engine model)
- [Lycoming O&VO-360 series](https://openairdocs.org/engine/lycoming-o-vo-360-series): 11,931 aircraft (engine model)
- [Lycoming I0360 series](https://openairdocs.org/engine/lycoming-i0360-series): 6,174 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)
- [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-360-L2A](https://openairdocs.org/engine/lycoming-io-360-l2a): 2,644 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 IO-540-AE1A5](https://openairdocs.org/engine/lycoming-io-540-ae1a5): 1,040 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): 882 aircraft (engine model)
- [Lycoming IO-360-A1B6D](https://openairdocs.org/engine/lycoming-io-360-a1b6d): 844 aircraft (engine model)
- [Lycoming IO-540-AB1A5](https://openairdocs.org/engine/lycoming-io-540-ab1a5): 773 aircraft (engine model)
- [Lycoming TIO-540-AJ1A](https://openairdocs.org/engine/lycoming-tio-540-aj1a): 720 aircraft (engine model)
- [Lycoming O-360-A1A](https://openairdocs.org/engine/lycoming-o-360-a1a): 601 aircraft (engine model)
- [Lycoming TIO-540-AK1A](https://openairdocs.org/engine/lycoming-tio-540-ak1a): 508 aircraft (engine model)

All 394 models: https://openairdocs.org/ad/2004-10-14/models.md
Every aircraft: https://openairdocs.org/ad/2004-10-14/aircraft.md

## Related documents

- [AD 91-14-22](https://openairdocs.org/ad/91-14-22) (historical): Crankshaft Gear Retaining Bolt · Textron Lycoming, AVCO --All engine models. Effective Aug 19, 1991. Replaced by this AD
- [Proposed rule 89-ANE-10-AD](https://openairdocs.org/proposed/89-ANE-10-AD): Notice of proposed rulemaking (NPRM), published Mar 25, 2003

Its text cites no advisory circulars or STCs.

## NTSB investigations that cite this AD (5)

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 ERA23LA037](https://openairdocs.org/ntsb/ERA23LA037), Oct 23, 2022: Piper PA-28-235 (N8580N), Spartanburg, SC, substantial damage. Probable cause: A partial separation of the crankshaft gear/bolt, which resulted in a total loss of engine power.
- [NTSB ERA21FA133](https://openairdocs.org/ntsb/ERA21FA133), Feb 20, 2021: Piper PA32RT (N10KV), Vinemont, AL, destroyed, 2 fatal. Probable cause: A loss of engine power for reasons that could not be determined.
- [NTSB ERA18LA190](https://openairdocs.org/ntsb/ERA18LA190), Jul 11, 2018: Glasair SH2 (N352GL), Passadumkeag, ME, substantial damage. Probable cause: A total loss of engine power due to a fatigue fracture of the crankshaft.
- [NTSB CEN14LA449](https://openairdocs.org/ntsb/CEN14LA449), Aug 22, 2014: Piper PA 28-161 (N8440N), New Orleans, LA, substantial damage. Probable cause: The in-flight fatigue failure of the crankshaft gear retaining bolt, which resulted in a total loss of engine power. Contributing to the accident were the pilot/owner’s failure to maintain the…
- [NTSB ATL06LA027](https://openairdocs.org/ntsb/ATL06LA027), Dec 27, 2005: Piper PA32-300 (N2887M), Maiden, NC, substantial damage. Probable cause: The total loss of engine power due to the failure of the No. 5 main bearing due to overheating for undetermined reasons.

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