In the world of aviation
The sequence in which pilots start engines may seem trivial, but it holds significant importance in ensuring safety and efficiency. Specifically, in aircraft like the Airbus A320, pilots adhere to the practice of starting engine 2 before engine 1. This procedure is rooted in practical reasons that relate to hydraulic systems and airflow dynamics, which are crucial for the effective operation of the aircraft.
The Importance of Engine 2 in Hydraulic Systems
Starting engine 2 first plays a pivotal role in the activation of the aircraft’s hydraulic systems. In the Airbus A320, engine 2 is responsible for powering the yellow hydraulic pump. This pump is essential for operating the yellow hydraulic system, which controls critical components like the parking brakes. By ensuring that this hydraulic system is up and running prior to starting engine 1, pilots can enhance the aircraft’s pre-flight checks and ensure that all systems are ready to handle various operational requirements upon takeoff.
Benefits of Starting Engine 2 First:
- Enhances pre-flight checks
- Ensures readiness of hydraulic systems
- Addresses safety protocols related to braking and control
Common Practices in Engine Start Sequences
While the A320 has a designated starting sequence, it’s worth noting that practices can vary between different aircraft models. For instance, modern aircraft have evolved to allow flexibility in the engine starting sequence. Nevertheless, it remains common within the aviation community to start the right engine first, particularly in models like the Boeing 737.
| Aircraft Model | Engine Start Sequence |
|---|---|
| Airbus A320 | Engine 2 before Engine 1 |
| Boeing 737 | Engine 2 before Engine 1 |
The standard operating procedure, as set forth in the Boeing 737’s Flight Crew Operating Manual (FCOM), suggests starting engine 2 before engine 1. This sequence not only preserves tradition but also aligns with safety protocols that mitigate potential operational risks.
Airflow Dynamics and Engine Start
Another critical reason for starting engine 2 first pertains to airflow dynamics. When pilots start one engine at a time, it is strategic to start the right engine. The spinning propeller or fan of the running engine creates airflow, also known as prop wash, which assists in the starting of the second engine.
Key Points on Airflow Dynamics:
- Starting engine 2 after engine 1 benefits from the airflow (prop wash)
- Reduces the risk of engine failure during startup
- Ensures smooth ignition for the second engine
In conclusion, the practice of starting engine 2 first is a well-established protocol in aviation, particularly in aircraft such as the Airbus A320 and various Boeing models. It encompasses a blend of hydraulic system considerations, standard operating procedures, and aerodynamic advantages that contribute to safe and efficient flight operations. Understanding these procedures unveils the meticulous nature of aviation practices and the commitment to safety that is paramount in the industry.