AD/B737/143 - Fuel Low Pressure Switches and Boost Pumps (Cth)

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES

Boeing 737 Series Aeroplanes

AIRWORTHINESS DIRECTIVE

For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.

AD/B737/143 Fuel Low Pressure Switches and Boost Pumps 7/2000

Applicability: Model 737-100, -200, -300, -400 and -500 series aeroplanes line number 1 through 3002 inclusive.

Requirement: 1. Inspect main tank fuel boost pumps to determine if one or more pumps were manufactured by General Electric Company (GEC) of the United Kingdom. If GEC pumps are fitted test each pump in accordance with instructions in Boeing Alert Service Bulletin 737-28A1114 Revision 2 dated January 28, 1999. If the fuel boost pump output pressure is less that 23 pounds per square inch gauge (psig) as measured at the inlet to the engine fuel pump; or less than 36 psig as measured at the fuel boost pump low pressure switch, replace the fuel boost pump with a new or serviceable fuel pump in accordance with the Alert SB.

2. No aircraft shall be dispatched with any main fuel boost pump inoperative unless initial testing and any follow on corrective action in accordance with Requirement 1 have been complied with.