AD/BEECH 50/33 - Interior Door Handles

Overview

The Civil Aviation Regulations 1998, specifically Part 39 - 105, includes a legislative instrument that addresses safety concerns related to the interior door handles of Beechcraft 50 (Twin Bonanza) Series Aeroplanes. This directive, known as AD/BEECH 50/33, was introduced to mitigate the risk of unintended door openings during flight, which could potentially lead to loss of control. The Civil Aviation Safety Authority issued this directive in response to multiple reports received by the Federal Aviation Administration regarding the utility and cabin door handles opening without the lock release button being depressed. The policy objective is to ensure that these door handles function correctly to maintain the safety and control of the aircraft. The directive became effective on 6 November 1997, requiring compliance within 50 hours’ time in service or at the next door handle removal, whichever comes first.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105, apply to Beechcraft 50 (Twin Bonanza) Series Aeroplanes, including all models 50, B50, and C50, regardless of their serial numbers. This legislative instrument mandates checks on the cabin side door handle and the utility door handle from the interior of the aircraft to ensure proper locking mechanisms. The directive requires operators to verify that the door handles function correctly by rotating them clockwise without depressing the lock release button, and if they open the door without this action, the lock must be corrected as per the Accomplishment Instructions in Raytheon Service Bulletin 2693. The directive becomes effective on 6 November 1997 and compliance is mandatory unless the required actions have already been completed, within 50 hours’ time in service after the directive date or at the next door handle removal after 6 November 1997, whichever occurs first, and thereafter whenever a utility or cabin interior door handle is removed. This directive aims to prevent the unintentional opening of cabin and utility doors from the interior, which could potentially lead to loss of control due to pilot distraction.

Key Provisions

The Civil Aviation Regulations 1998, particularly Part 39 - 105, mandate specific safety measures for Beechcraft 50 (Twin Bonanza) Series aeroplanes through an Airworthiness Directive (AD/BEECH 50/33). This directive, effective from 6 November 1997, focuses on ensuring that the cabin side door handle and the utility door handle function correctly to prevent unintentional opening from the interior of the aircraft. Operators must inspect these handles (Section 12/97) and, if necessary, correct the locking mechanism by following the instructions outlined in Raytheon Service Bulletin 2693. If the door handle opens the door without the lock release button being depressed, operators must remove and reinstall the handle as specified. If the handle is functioning correctly, no further action is required. The obligations imposed by this legislation require operators of Beechcraft 50 models, including 50, B50, and C50 series, to conduct the specified checks and corrections. The directive applies to all serial numbers of these models. The checks and any necessary corrective actions must be performed within 50 hours of time in service after 6 November 1997 or at the next removal of a door handle after that date, whichever comes first. Additionally, these checks must be repeated whenever a utility or cabin interior door handle is removed. Failure to comply with the AD/BEECH 50/33 can result in significant safety risks, such as the unintentional opening of cabin doors, which could lead to a loss of control. Such non-compliance is considered a breach of the Civil Aviation Regulations. Penalties for breaches of these regulations can include enforcement actions, fines, and potentially grounding of the aircraft until compliance is verified. The seriousness of the potential consequences underscores the importance of adhering to the specified safety measures to maintain airworthiness and ensure the safety of all onboard.