DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

[Docket No.          ; AD 54-04-01] 

Airworthiness Directives; AC Spark Plug Model AC LA/87 Spark Plugs.

AGENCY:	Federal Aviation Administration (FAA), DOT. 

ACTION:	Final rule.  

DATES:	Effective March 1, 1954.

54-04-01   AC SPARK PLUG: 

	Applies to All Engines Equipped With AC LA-87 Spark Plugs, Except Pratt and Whitney R-1830 Engines of 1,200 HP or Less and Wright R-1820 Engines of 1,200 HP or Less. 

	Compliance required prior to March 1, 1954. 
	A.	In order to preclude possibilities of engine failure, when using ACLS-87 spark plugs in engines for which they are not approved, these spark plugs must be removed from all engines with the exceptions of the R-1820 having a T.O. rating of 1,200 h.p. or less and the R-1830 having a T.O. rating of 1,200 h.p. or less. 
	B.	On R-1820 and R-1830 engines of 1,200 h.p. or less, the LS-87 plug is limited to a maximum of 120 hours of service with no reconditioning permitted. Plugs having over 120 hours must be removed from service. 

This supersedes AD 49-26-02