Commonwealth legislation

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

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Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

5/10 complexity

This Airworthiness Directive requires operators of Boeing 737-100/200/300/400/500 aircraft (line numbers 1–3002) to inspect main tank fuel boost pumps for certain General Electric (GEC) pumps, test pump output against set pressure limits, replace pumps that fail, and fit higher-threshold low‑pressure switches. It also prohibits dispatch with any main boost pump inoperative until the initial testing and corrective actions are done. The rules include staged deadlines and recurring tests until the switch replacement is completed.

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Current sections

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AIRWORTHINESS DIRECTIVE

View image in the official source

View image in the official source
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 a

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.

3. Replace all 4 low pressure switches installed downstream of the main fuel boost pumps with higher threshold low pressure switches in accordance with Boeing SB 737-28A1114 Revision 2.

Note : FAA AD 2000-04-02 Amendment 39-11584 refers.

Compliance: 1. Prior to the accumulation of 3,000 flight hours or within 1 year from the aircraft date of manufacture, or within 90 days from the effective date of this Directive whichever occurs first. Thereafter, retest at intervals not exceeding 6 months time in service until Requirement 3 has been complied with.

2. Prior to further flight after the effective date of this Directive.

3. Within 2 years time in service from the effective date of this Directive. This Airworthiness Directive becomes effective on 13 July 2000.

Source text

Sourced from the Federal Register of Legislation (legislation.gov.au), CC BY 4.0.

AIRWORTHINESS DIRECTIVE AIRWORTHINESS DIRECTIVE

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

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.

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.

3. Replace all 4 low pressure switches installed downstream of the main fuel boost pumps with higher threshold low pressure switches in accordance with Boeing SB 737-28A1114 Revision 2.

Note : FAA AD 2000-04-02 Amendment 39-11584 refers.

2. Prior to further flight after the effective date of this Directive.

3. Within 2 years time in service from the effective date of this Directive. This Airworthiness Directive becomes effective on 13 July 2000.