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.
Boeing 767 Series Aeroplanes
AD/B767/164 Oil Filter Differential Pressure Switch 3/2002
Applicability: Model 767 series aeroplanes, as listed in Boeing Service Bulletin (SB) 767-79-0008 dated 11 August 1988 equipped with engine oil filter differential pressure switches on JT9D-7R4 engines and all Model 767 series aeroplanes with PW4000 engines equipped with engine oil filter differential pressure switches.
Requirement: 1. Replace the engine oil filter differential switch as follows:
- For Pratt & Whitney PW4000 engines - Replace switch part number (P/N) S332T004-23 with a new -23 switch.
b. For Pratt & Whitney JT9D-7R4 engines - Replace switch P/Ns S332T004- 2, -25 or -29 with a new -29 switch.
Incorporation of switches P/N 21-SN04-403 or 21-SN04-415 in accordance with SB 767-79-0020 dated 14 November 1996 or Revision 1 dated 18 June 1998, as applicable, or P/N S332T004-32 in accordance with either SB 769- 79-0013 Revision 3 dated 7 January 1999 or Revision 4 dated 19 December 2001 is considered an alternate method of compliance to this Directive and terminating action for the Requirement 1.b. repetitive inspections.
2. Pressure switches removed following the accumulation of 10,000 hours time in service (TIS) shall not be reinstalled on any aeroplane. (Reworking, modifying or overhauling a used switch does not zero time the switch.)
Note: FAA AD 91-09-15 Amdt 39-6974 refers.
Compliance: For Requirement 1 - Initially, if not previously accomplished, within 60 days after the effective date of this Directive or before the accumulation of 10,000 hours total TIS, whichever occurs first, and thereafter at intervals not to exceed 10,000 hours TIS. If the switch has been previously replaced, continue to replace the switch at intervals not to exceed 10,000 hours TIS from the last switch replacement.
For Requirement 2 - As of the effective date of this Directive.
This Airworthiness Directive becomes effective on 21 March 2002.
Boeing 767 Series Aeroplanes
AD/B767/164 (continued)
Background: The United States Federal Aviation Administration received reports of in-flight engine shutdowns due to either Engine Indicating and Crew Alerting System (EICAS) indication of oil filter bypass or loss of oil quantity due to a leak in the oil filter differential pressure switch. This Directive introduces measures to prevent false oil filter bypass indication or loss of oil quantity.
Eugene Paul Holzapfel
Delegate of the Civil Aviation Safety Authority 7 February 2002
The above AD is notified in the Commonwealth of Australia Gazette on 27 February 2002.
Overview
The Civil Aviation Safety Authority (CASA) issued Airworthiness Directive (AD) AD/B767/164 in 2002 to address safety concerns associated with engine oil filter differential pressure switches in Boeing 767 series aeroplanes. This AD was enacted under the Civil Aviation Act 1988 to rectify the unsafe conditions that could lead to in-flight engine shutdowns due to false oil filter bypass indications or oil leaks. The AD requires specific replacements of the engine oil filter differential pressure switches on Pratt & Whitney PW4000 and JT9D-7R4 engines, and prohibits the reinstallation of switches that have accumulated 10,000 hours of total time in service. The objective of the directive is to ensure the continued airworthiness of the affected aircraft by mitigating the risks identified by the United States Federal Aviation Administration.
Scope and Application
The Airworthiness Directive issued under the Civil Aviation Regulations 1998 by the Civil Aviation Safety Authority (CASA) applies specifically to Boeing 767 series aeroplanes equipped with certain engine oil filter differential pressure switches. This applies to aircraft with JT9D-7R4 engines and those with PW4000 engines, as detailed in Boeing Service Bulletin 767-79-0008. The directive mandates the replacement of specific parts of the oil filter differential pressure switches to address safety concerns, particularly to prevent in-flight engine shutdowns due to false oil filter bypass indications or oil quantity loss. The requirement includes replacing the switches at intervals not exceeding 10,000 hours of total time in service, and once removed, the switches should not be reinstalled. This directive became effective from 21 March 2002 and applies nationally within the Commonwealth of Australia. The directive also extends its application through subordinate instruments to ensure compliance with safety standards across the aviation industry.
Key Provisions
This Airworthiness Directive (AD) issued by the Civil Aviation Safety Authority (CASA) under subregulation 39.1(1) of the Civil Aviation Regulations 1998 applies to certain Boeing 767 series aeroplanes equipped with engine oil filter differential pressure switches on JT9D-7R4 engines or PW4000 engines. The AD mandates specific actions to address safety concerns regarding engine shutdowns caused by false oil filter bypass indications or oil quantity loss due to leaks in the oil filter differential pressure switch (sections 1 and 2). For Pratt & Whitney PW4000 engines, the AD requires replacing the switch part number S332T004-23 with a new -23 switch, while for Pratt & Whitney JT9D-7R4 engines, it requires replacing switch part numbers S332T004-2, -25, or -29 with a new -29 switch. Additionally, incorporating switches P/N 21-SN04-403 or 21-SN04-415, as per specified service bulletins, or P/N S332T004-32, also as per specified service bulletins, is considered an alternate method of compliance for JT9D-7R4 engines. Switches removed after accumulating 10,000 hours of total time in service (TIS) must not be reinstalled on any aeroplane, and reworking, modifying, or overhauling a used switch does not reset the TIS counter.
Operators of the affected Boeing 767 series aeroplanes must ensure compliance with the AD by replacing the specified oil filter differential pressure switches within 60 days of the AD's effective date or before accumulating 10,000 hours TIS, whichever occurs first, and subsequently at intervals not exceeding 10,000 hours TIS from the last switch replacement. Additionally, switches removed after accumulating 10,000 hours TIS must not be reinstalled on any aeroplane. Failure to comply with this AD could result in unsafe conditions that might lead to in-flight engine shutdowns, posing significant safety risks. Compliance with the AD is mandatory, and non-compliance could lead to enforcement actions by CASA.
The AD does not explicitly outline specific penalties for non-compliance; however, under the Civil Aviation Act 1988 and the Civil Aviation Regulations 1998, CASA has the authority to take enforcement actions, which may include fines, suspension, or revocation of certificates of airworthiness, operational permits, or licenses. The exact penalties may vary depending on the severity and circumstances of the non-compliance. Operators are advised to adhere strictly to the AD to ensure the continued airworthiness and safety of their Boeing 767 series aeroplanes.