74-22-04: Crankcase

FAA order 74-22-04 is an airworthiness directive in force since October 28, 1974. The FAA's subject line: Crankcase. It names the Continental 6-320 series engine: about 2 aircraft on the U.S. register today, 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: Continental Motors
Models: 6-285-B
Engine series: Continental 6-320 series 2 aircraft

Dates and paperwork

In force since: October 28, 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 (608 characters)

74-22-04	TELEDYNE CONTINENTAL MOTORS:  Amendment 39-1998.  Applies to TCM Model 6-285- B engines with engine serial numbers 700000 through 700095. 
	Compliance required within the next 25 hours time in service after the effective date of this AD unless already accomplished. 
	Inspect the crankcase main bearing oil supply passages in accordance with procedures outlined in Teledyne Continental Service Bulletin M74-21.  After compliance with this bulletin, if it is determined that an oil passage has been omitted the engine must be removed from service. 
	This amendment becomes effective October 28, 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/74-22-04.json · aircraft systems.