Title: Understanding Airbus A/THR RETARD Mode in Automatic Landings
Introduction
As a professional pilot operating Airbus aircraft, it is crucial to comprehend the intricacies of various flight modes to ensure a safe and efficient flight. One such mode that plays a pivotal role during automatic landings is the A/THR RETARD mode. In this article, we will delve into the details of how the A/THR RETARD mode functions and its significance in the final stages of landing.
Activation of A/THR RETARD Mode
The A/THR RETARD mode is specifically designed for employment during automatic landings. This mode comes into play when the aircraft descends to an altitude of approximately 30 feet Radio Altitude (RA). At this point, the A/THR RETARD mode automatically engages, initiating a sequence of actions to facilitate a smooth and controlled landing.
FMA Display and Thrust Setting
Once the A/THR RETARD mode is activated, the Flight Mode Annunciator (FMA) prominently displays THR IDLE, signaling the transition to the RETARD phase. Simultaneously, the Autothrust (A/THR) system takes charge of the thrust setting, adjusting it to idle to prepare for the landing. This automated process ensures that the aircraft is in an optimal configuration for a safe touchdown.
RETARD Callout and Manual Landing Distinction
A crucial aspect of the A/THR RETARD mode is the callout that triggers at 10 feet RA during an automatic landing. This callout serves as a reminder to the flight crew to set the thrust levers to the IDLE detent manually. The timely execution of this action is essential for a seamless transition from descent to the landing phase.
It's important to note that in the scenario of a manual landing, the RETARD callout occurs earlier, specifically at 20 feet RA. This distinction underscores the automation adjustments made during automatic landings, highlighting the nuanced differences in the operational procedures based on the chosen landing mode.
Conclusion
In conclusion, the A/THR RETARD mode in Airbus aircraft is a crucial component of the automatic landing system. Its activation at approximately 30 feet RA, the subsequent display of THR IDLE on the FMA, and the callout at 10 feet RA collectively contribute to a well-coordinated and controlled landing sequence. As professional pilots, understanding the nuances of this mode enhances our ability to operate these advanced aircraft safely and effectively, especially during critical phases of flight such as the landing.