AD/CESSNA 150/14 Amdt 1 - Pneumatic Stall Warning System

Overview

The Civil Aviation Regulations 1998, amended by the Civil Aviation (Airworthiness) Regulations 2008, introduced a series of measures to enhance aviation safety through the implementation of airworthiness directives. One such directive pertains to the Cessna 150, F150, 152, and F152 series aeroplanes, specifically addressing the pneumatic stall warning system. This legislative instrument was enacted to mitigate the risk of inoperative or inadequate stall warning systems, which could compromise flight safety by not adequately alerting pilots of approaching stall conditions. The Civil Aviation Safety Authority (CASA), acting under the authority of the Parliament of the Commonwealth of Australia, established these regulations with the policy objective of ensuring that aircraft maintain a high standard of airworthiness, thereby protecting passengers and crew. The specific amendment referenced in the legislative instrument, AD/CESSNA 150/14 Amendment 1, mandates a pre-flight check of the pneumatic stall warning system, ensuring its correct operation by applying a slight suction at the stall warning opening in the left wing. Additionally, it requires the installation of a placard reminding pilots to test the system before each flight. Compliance with these directives is crucial for maintaining the integrity of the stall warning system, with checks required before each flight and placard installation within 25 hours time in service after a specified date. This directive ensures that the aircraft meet the required safety standards, thereby enhancing overall aviation safety.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105, governs the airworthiness directives pertinent to various aircraft, including the Cessna 150, F150, 152, and F152 series aeroplanes. This legislative instrument mandates checks and modifications on pneumatic stall warning systems for specific models, ensuring operational safety and compliance with civil aviation standards. The directive applies to all Cessna models equipped with pneumatic stall warning systems that do not incorporate the specified horn reed assemblies and protective screens. The requirement for pilots to conduct a pre-flight test of the stall warning system and to display a specific placard within the cockpit is explicitly outlined. Furthermore, compliance with these provisions must be achieved within specified timeframes to maintain airworthiness. The regulation’s applicability is enforced by the Civil Aviation Safety Authority, extending its jurisdiction across the Commonwealth of Australia. Any modifications or updates to the applicable part numbers are incorporated through amendments to the legislative instrument, ensuring the directive remains current and effective.

Key Provisions

The main sections of this Civil Aviation Safety Authority (CASA) directive pertain to the pneumatic stall warning system of Cessna 150, F150, 152 & F152 series aeroplanes (Section 1). Specifically, these provisions apply to all models with a pneumatic stall warning system that does not include the horn reed assembly parts P/N 0413483-2, P/N 0713348-1 or subsequent, and protective screens over the horn bell and the stall warning system opening on the left wing. Section 1 of the directive requires operators to check the pneumatic stall warning system by applying a slight suction with the mouth at the stall warning opening in the left wing, ensuring the horn provides a clearly audible sound (Section 1(1)). It also mandates the installation of a placard stating "PRE-FLIGHT TEST THE PNEUMATIC STALL WARNING SYSTEM" in full view of the pilot (Section 1(2)). Compliance with these requirements must be achieved either by performing the specified checks before each flight or by making modifications to the aircraft as outlined (Section 1). The obligations imposed by this directive include regular pre-flight checks of the pneumatic stall warning system by the pilot, or making the specified modifications to the aircraft (Section 1). Operators must ensure that the stall warning system is operational and that the required placard is visible to the pilot. These obligations are critical to maintaining the safety and airworthiness of the aircraft, ensuring that the stall warning system functions as intended, and that pilots are adequately informed and reminded of the necessity to check this system pre-flight. Failure to comply with the requirements set out in this directive may result in civil or criminal consequences. While the specific penalties are not detailed in the text provided, non-compliance with CASA directives can lead to enforcement actions under the Civil Aviation Act 1988, including fines and potential grounding of the aircraft. The seriousness of such consequences underscores the importance of adhering to the specified requirements to maintain safety standards and regulatory compliance.