73-05-01: Connecting Rod Bearing Assemblies
FAA order 73-05-01 is an airworthiness directive in force since July 9, 1974. The FAA's subject line: Connecting Rod Bearing Assemblies. It names the Lycoming VO-540-B1B3, Lycoming VO-540-C2A, Lycoming VO-540 series engines: about 119 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
- Models
- IVO-540-A1A, TIVO-540-A2A, TVO-540-A1A, VO-540-A1A, VO-540-A2A, VO-540-B1A, VO-540-B1B, VO-540-B1B3, VO-540-B1C, VO-540-B1D, VO-540-B1E, VO-540-B1F, VO-540-B1H3, VO-540-B2A, VO-540-B2C, VO-540-B2D, VO-540-B2E, VO-540-B2G, VO-540-C1A, VO-540-C1B, VO-540-C1C3, VO-540-C2A, VO-540-C2B, VO-540-C2C
- Engine series
- Lycoming VO-540-B1B3 3 aircraft
Lycoming VO-540-C2A 6 aircraft
Lycoming VO-540 series 110 aircraft
Dates and paperwork
- In force since
- July 9, 1974
- 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 (2,334 characters)
73-05-01 AVCO LYCOMING: Amendment 39-1595 as amended by Amendment 39-1843 is further amended by Amendment 39-1889. Applies to VO-540 Series engines beginning with S/N 101-43 thru 2299-43, IVO-540 series engines beginning with S/N 101-60 thru 150-60, TVO-540 Series engines beginning with S/N 101-53 thru 103-53 and TIVO-540 Series engines beginning with S/N 101-57 thru 163-57 and all similar series engines overhauled (also known as remanufactured) by Lycoming before January 2, 1974 except the following Serial Numbers: RL-376-43, RL-483-43, RL-693-43, RL-695-43, RL-1091-43, RL-1205-43, RL-1429-43, RL- 1753-43, RL-1960-43, RL-2017-43, RL-2032-43, RL-2125-43, RL-2139-43, RL-2244-43, RL-2245-43 and RL-2275-43.
Compliance required as indicated after the effective date of this AD, unless already accomplished or unless higher crush bearing P/N LW13212 has been installed in accordance with Lycoming Service Bulletins No. 303E or 303F.
To prevent failures of P/N 71947, P/N 73174, P/N75548 and P/N LW10776 connecting rod assemblies and P/N 77450 connecting rod assembly with P/N 75547 connecting rod bearing installed in accordance with Lycoming Service Bulletins No. 303B, 303C or 303D, accomplish the following:
a. Engines with connecting rod assemblies that have accumulated 400 hours or more in service since new or overhaul must have the connecting rod assemblies replaced with new connecting rod assembly, P/N LW13422 and new connecting rod bearing P/N LW13212, within the next 50 hours in service.
b. Engines that have connecting rod assemblies with less than 400 hours in service must have the connecting rod assemblies replaced with new connecting rod assembly, P/N LW13422 and new connecting rod bearing, P/N LW13212 prior to 450 hours in service.
c. Engines that have been modified in accordance with Lycoming Service Bulletins No. 303B, 303C or 303D must comply with items (a) or (b) above, except that the P/N 77450 connecting rod, free of any galling maybe reused with P/N LW12596 connecting rod bolts and identified as assembly number LW13422.
NOTE: Lycoming Service Bulletin No. 371A applies to this subject.
Amendment 39-1595 superseded AD 65-13-07 and became effective February 28, 1973.
Amendment 39-1843 was effective May 17, 1974.
This Amendment 39-1889 is effective July 9, 1974.
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/73-05-01.json · aircraft systems.