AD/F100/50 Amdt 2 - Engine - Reverse Thrust Operations Limitations

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Legislation au F2006B09653 Not in force Legislative Instrument

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AIRWORTHINESS DIRECTIVE

On the effective date specified below, and for the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/F100/50 Amdt 1 and issues the following AD under subregulation 39.1 (1) of CASR 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.

 

Fokker F100 (F28 Mk 100) Series Aeroplanes

 

AD/F100/50

Amdt 2


Engine - Reverse Thrust Operations Limitations 13/2004

 

 

Applicability: All Fokker 100 (F28 Mk 100) Series aeroplanes with Rolls Royce Tay 650-15 engines installed.

 

Requirement: Amend the Fokker 100 Airplane Flight Manual, Part 1, Limitations Section, 2.06.01 opposite to page 2 and read as continuation of “THRUST REVERSER” paragraph, to include the following.

 

  1. For aircraft not embodying modification per Fokker SB F100-31-060 (N1 alerting system), or the N1 alerting system is inoperative.

 

  1. Use of reverse thrust above idle is prohibited in normal operations, except for approved powerback as described below in para 1.c. If it is used, then it must be recorded in the aircraft technical log.

 

b.        If reverse thrust above idle has been used, the instructions detailed in Section

3.A of Rolls Royce SB TAY-72-1447 Rev 5 must be accomplished before next flight unless it can be demonstrated by means of flight data recorder information that the engine has not been operated in the N1 speed range 57 to 75 percent for 7.5 seconds or more. Exchange the complete set of fan blades and the fan rotor if a cracked fan blade is found during the inspections.

 

c.         Powerback is prohibited unless specifically approved by Rolls Royce. Powerback shall not be used above 55 percent N1 speed. If powerback results in operation of the engine between 57 and 75 percent N1 speed, the instructions detailed in Section 3.B of the Rolls Royce SB TAY-72-1447 Rev 5 must be accomplished before next flight unless it can be shown by means of flight data recorder information that the engine has not been operated in the N1 speed range 57 to 75 percent for 7.5 seconds or more. Exchange the complete set of fan blades and the fan rotor if a cracked fan blade is found during the inspections.

 

2.         For aircraft embodying modification per Fokker SB F100-31-060 (N1 alerting system) and the alerting system is operative. Requirement 1 is applicable when the alerting system is inoperative.

 

  1. Use of reverse thrust in a stabilised condition between 57 and 75 percent N1 speed is prohibited.

 

b.        If reverse thrust is used between 57 and 75 percent N1 speed for greater than

7.5 seconds the N1 alerting system will instruct a fan blade inspection and the instructions detailed in Section 3.A of Rolls Royce SB TAY-72-1447 Rev 4 must be accomplished before next flight. Exchange the complete set of fan blades and the fan rotor if a cracked fan blade is found during the inspections.

 

c.         Powerback is prohibited unless specifically approved by Rolls Royce. Power back shall not be used above 55 percent N1 speed. If use of powerback results in operation of the engine between 57 and 75 percent N1 speed for greater than 7.5 seconds the N1 alerting system will instruct a fan blade inspection and the instructions detailed in Section 3.B of Rolls Royce SB TAY-72-1447 Rev 4 must be accomplished before next flight. Exchange the complete set of fan blades and the fan rotor if a cracked fan blade is found during the inspections.

 

Note: LBA AD 2002-090R1 EASA Approval No. 2004-9948 refers.

 

Compliance: Not later than 21 January 2005.

 

This Amendment becomes effective on 23 December 2004.

 

Background: This amendment reflects the latest revision of the requirement document that introduces changes to the inspection requirements for fan blades following exceedances as detailed in the requirements section of this Directive.

 

The latest failure of the LP Compressor resulted in penetration of the aircraft fuselage resulting in a fatality. This failure was caused by fan blade resonance when operated at speeds outside the limits specified in the requirements section.

 

The original issue of this AD became effective on 16 May 2002 and refers to CASA AD/TAY/1 for inspection requirements when the thrust reverser operating limits are exceeded. This amendment includes the fan inspection requirements detailed in Rolls Royce SB TAY-72-1447 Rev 4 and hence AD/TAY/1 is cancelled.

 

Amendment 1 of this Airworthiness Directive became effective on 8 August 2002.


James Coyne

Delegate of the Civil Aviation Safety Authority 9 November 2004

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


The above AD is notified in the Commonwealth of Australia Gazette on 1 December 2004.

Overview

The Civil Aviation Safety Authority Act 1998, enacted by the Australian Parliament, addresses the need for comprehensive aviation safety regulations to ensure the highest standards of airworthiness and safety in Australian airspace. This Act empowers the Civil Aviation Safety Authority (CASA) to issue airworthiness directives, including the amendment in question here, to address specific safety concerns that may arise with particular aircraft models. This particular Airworthiness Directive, AD/F100/50 Amdt 2, was introduced to address the risk of fan blade failure in Fokker 100 (F28 Mk 100) Series aeroplanes with Rolls Royce Tay 650-15 engines, following an incident where a failure resulted in a fatality. The directive mandates specific operational limitations and inspection protocols to mitigate the risk of similar incidents in the future, reflecting CASA's commitment to ensuring the ongoing safety of aircraft operating within Australia.

Scope and Application

The Airworthiness Directive (AD) AD/F100/50 Amdt 2 issued under subregulation 39.1 (1) of the Civil Aviation Safety Regulations 1998 applies to all Fokker 100 (F28 Mk 100) Series aeroplanes equipped with Rolls Royce Tay 650-15 engines. This legislative instrument mandates specific actions to rectify identified unsafe conditions related to the use of reverse thrust operations on these aircraft. The directive requires amendments to the Fokker 100 Airplane Flight Manual, specifically altering the thrust reverser limitations to address risks associated with operating the engines outside specified N1 speed ranges. The requirements differ slightly depending on whether the aircraft has an operational N1 alerting system. For aircraft without an operative N1 alerting system or where the system is inoperative, the use of reverse thrust above idle is strictly prohibited except for approved powerback operations, with specific procedures to be followed if reverse thrust is used. For aircraft with an operative N1 alerting system, similar restrictions apply but are enforced by the system itself, which mandates inspections and procedures if certain speed thresholds are exceeded. The directive mandates compliance by 21 January 2005, effective from 23 December 2004, and incorporates revisions to inspection requirements following documented failures that led to severe consequences, including a fatality.

Key Provisions

The main sections of the Airworthiness Directive (AD) AD/F100/50 Amdt 2 are the applicability, requirement, and compliance sections (1-3). Section 1 specifies that the AD applies to all Fokker 100 (F28 Mk 100) Series aeroplanes with Rolls Royce Tay 650-15 engines installed. Section 2 outlines the requirements, which include amending the Fokker 100 Airplane Flight Manual, Part 1, Limitations Section, 2.06.01 opposite to page 2, to include the new instructions regarding reverse thrust operations. Section 3 details the compliance timeline, which requires compliance not later than 21 January 2005. The AD imposes several obligations on the parties governed by it. Firstly, operators of the affected Fokker 100 aeroplanes must amend their flight manuals as specified in the requirements section. For aircraft not equipped with the N1 alerting system or where the system is inoperative, they must prohibit the use of reverse thrust above idle in normal operations unless it is for approved powerback. In such cases, the use of reverse thrust must be recorded in the aircraft technical log. Secondly, if reverse thrust is used, certain procedures must be followed before the next flight. Thirdly, powerback is prohibited unless specifically approved by Rolls Royce, and if it is used, the N1 speed must not exceed 55 percent. There are no specific offences, penalties, or civil/criminal consequences mentioned in the AD for non-compliance. However, failure to comply with airworthiness directives can lead to significant consequences, including the potential for aircraft to be grounded, which could result in financial losses and reputational damage for operators. Additionally, non-compliance could lead to investigations by the Civil Aviation Safety Authority (CASA) and enforcement actions under the Civil Aviation Act 1988 and Civil Aviation Regulations 1988. The penalties for non-compliance with these regulations can include substantial fines and, in severe cases, criminal charges.

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Sourced from the Federal Register of Legislation at 26 August 2026. For the latest information on Australian Government law please go to https://www.legislation.gov.au.