COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Embraer EMB-110 (Bandeirante) Series Aeroplanes
AD/EMB-110/24
Amdt 1
Applicability: All model EMB-110.
Control Wheel Spindle 1/92
Requirement: 1. Inspect Control Spindle as follows:
Remove control colume cover.
Measure diameter of forward thread of the spindle. If diameter is 3/4" no further action is necessary.
If diameter is 3/8" proceed with inspection:-
Remove spindle assembly and check vertical and conical wall thickness close to the aft ball bearing:
- Measure the depth of the large hole - this dimension should be 42mm approx.
b. Measure from the aft end to the aft bearing shoulder - this dimension should be 44 mm approx.
c. Calculate difference in dimension under (a) and (b).
d. Through the hole in the conical surface measure the wall thickness.
e. Crack detect all parts at the junction of the aft spindle in the region of the hole in the conical surface using the fluorescent magnetic particle method.
Condition 1.
If dimension calculated at (c) is equal or greater than 2.6 mm and the dimension at (d) is equal or greater than 2 mm and there is no crack indication, the spindle may be reinstalled and the aircraft returned to service.
Condition 2.
If dimensions determined (c) and (d) are below 2.6 mm and/or 2 mm respectively and there is no crack indication:-
Install a new spindle P/N 110-500-10-01-10-04. If not available it is permitted to reinstall P/N 4A-500-10-01-10-03 and repeat inspection by fluorescent magnetic particle method at intervals not exceeding 250 hours time in service until P/N 110-500-10-01-10-04 is available.
Condition 3.
If a crack is detected the spindle is unserviceable and must be discarded.
COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Install new spinddle P/N 110-500-10-01-10-04 if available or install a new spindle P/N 4A-500-10-01-10-03 and apply condition 1 or 2 as determined by inspection.
2. Replace spindles affected by repeat inspections as specified in Condition 2 of Requirement 1, with a spindle P/N 4A-500-10-01-10-03 provided it complies with Condition 1 of Requirement 1, or; replace with spindles P/N 111A-500-10-01-10- 01 or P/N 110-500-10-01-10-04.
Note 1: The terms aft end and forward end used in requirement 1 text have the following meaning:
Aft End - The end of the spindle with the greater diameter.
Forward End - The end of the spindle with the smaller threaded diameter.
Note 2: Embraer Alert SB 110-27-0070 and Brazil CTA AD 83-02-01 R3 refers.
Compliance: 1. Unless already accomplished; within 10 hours time in service after 12 January 1992, inspect in accordance with Requirement 1, until Requirement 2 is accomplished.
2. Prior to 29 February 1992.
The compliance of the previous issue of this Directive was: within 10 hours time in service after 15 February 1983 and thereafter as per requirement.
Background: The manufacturer has been notified of a structural failure of the control wheel spindle, which resulted in the detachment of the control wheel in flight. Amendment 1 is issued to align this Directive with a revision of the relevant country of origin AD which requires terminating action in lieu of inspections.
Overview
The Civil Aviation Regulations 1998, enacted by the Commonwealth of Australia, address the need for ensuring the safety of civil aviation through comprehensive regulations. This legislation, overseen by the Civil Aviation Safety Authority (CASA), aims to maintain high safety standards in the aviation sector, including the enforcement of airworthiness directives that ensure aircraft components meet specific safety requirements. One such directive, AD/EMB-110/24 Amendment 1, focuses on the inspection and replacement of control wheel spindles for Embraer EMB-110 (Bandeirante) series aeroplanes. This amendment was introduced to rectify a structural issue identified in the control wheel spindle that had caused detachment of the control wheel during flight. The policy objective is to enhance flight safety by ensuring the structural integrity of critical components, thereby preventing potential in-flight failures and ensuring the continued airworthiness of the aircraft.
Scope and Application
The Embraer EMB-110 Series Aeroplanes Airworthiness Directive (AD) applies to all models of EMB-110 aeroplanes. The AD specifies detailed inspection and replacement requirements for the control wheel spindle, which is crucial for the aircraft's control system. The directive mandates inspecting the diameter of the forward thread of the spindle and conducting further checks, including crack detection, to ensure the aircraft's airworthiness. Compliance with this AD is mandatory for aircraft operators and maintenance providers within the Australian Commonwealth, as it falls under the Civil Aviation Regulations 1998. The AD extends its applicability through subordinate instruments to ensure that all EMB-110 series aeroplanes adhere to the specified safety measures. There are no stated exclusions or exemptions within the directive, meaning all EMB-110 aeroplanes must comply with the outlined requirements.
Key Provisions
The Civil Aviation Regulations 1998, under PART 39 - 105 and the Civil Aviation Safety Authority Schedule of Airworthiness Directives, contains specific directives regarding the Embraer EMB-110 (Bandeirante) series aeroplanes, particularly in relation to the control wheel spindle. Section AD/EMB-110/24 Amendment 1 sets out the requirement to inspect the control spindle, detailing specific steps such as removing the control column cover and measuring the diameter of the spindle's forward thread. If the diameter is 3/4", no further action is needed. However, if the diameter is 3/8", more detailed inspections are mandated, including measuring the depth and distance of specific parts and conducting a crack detection using the fluorescent magnetic particle method. The regulation also provides conditions for when the spindle can be reinstalled, when it should be replaced with a new part, and when it must be discarded if any cracks are detected.
These regulations impose clear obligations on the parties involved, primarily focusing on ensuring the airworthiness and safety of the Embraer EMB-110 series aeroplanes. Operators and maintainers of these aircraft must comply with the specified inspection and maintenance requirements within set timeframes. Specifically, inspections must be conducted within 10 hours of time in service after 12 January 1992, until the specified replacement or reinstallation actions are taken. The directive also stipulates that certain compliance actions must be completed by 29 February 1992. These obligations are designed to prevent structural failures and ensure that any detected issues are addressed promptly and effectively.
Failure to comply with these airworthiness directives can result in severe consequences. The regulations outline that non-compliance with these specific requirements can lead to significant civil or criminal penalties. While the exact penalties are not detailed in the provided text, non-compliance with Civil Aviation Regulations in general can result in substantial fines, suspension or revocation of operating permits, and potential criminal charges for those responsible. The severity of the penalties underscores the importance of adhering to these safety directives to protect both the crew and passengers of the aircraft.