DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

[Docket No.          ; AD 54-21-01] 

Airworthiness Directives; AC Diaphram Type Fuel Pumps.

AGENCY:	Federal Aviation Administration (FAA), DOT. 

ACTION:	Final rule.  

DATES:	Effective November 30, 1954.

54-21-01  AC SPARK PLUG:

	Applies to All Aircraft Powered by Continental, Aircooled or Lycoming Engines Which Are Equipped With AC Diaphragm Type Fuel Pumps.
	Compliance required as soon as possible by not later than November 30, 1954.
	The occurence of severe fuel leakage in flight, caused by loosening of the AC fuel pump surge chambers, has revealed the existence of AC fuel pumps not adequately safetied to prevent loosening of the sediment bowl and the surge chamber.

	The following should be accomplished:

	1.	Inspect sediment bowl cap screw and surge chamber (if ther is one) for adequate safetying.
	2.	If not safetied, lockwiring or equivalent must be accomplished in accordance with good aircraft practice.  One acceptable method of safetying is described by Lycoming Service Bulletin No. 174.