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Why should airlines consider their battery service before re-entry into service?

Much of the rulebook for proper aircraft battery maintenance and wear-and-tear was developed on the basis of operational flight hours. However, after months where thousands of operational aircraft sit idle in storage, are we in uncharted territory? And what does that mean for battery serviceability and the traditional aircraft battery maintenance procedures?

Just a few months ago, you would have been hard-pressed to find someone that could foresee a future where nearly the entire global fleet would be parked for an indeterminate amount of time. Yet, here we are in that reality, and it has created some challenges for how operators and airlines should consider the maintenance of specific parts of their aircraft.

Aircraft batteries are one such part. Unlike many other aircraft parts where operational hours incur wear and tear, batteries are arguably more vulnerable where they are merely sitting idle. And in this article, we will be looking at some of the factors that airlines should consider regarding how often they should perform aircraft battery maintenance or replace their aircraft batteries.

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The life of an aircraft battery

Anyone that has forgotten to plug in their mobile phone at night, only to wake and find it dead, can understand the concept of battery self-discharge. While aircraft batteries are decidedly different, the rules of entropy and diminished-charge still apply. The rate of self-discharge is dependent on the type of battery, state of charge, charging current, ambient temperature and other factors. 

In regards to aircraft batteries, OEMs have rigorously researched these factors to determine presidents for determining a battery's serviceable life while in storage. SAFT recently released a bulletin addressing the battery storage recommendations of their batteries, which takes in the factors mentioned above of humidity, temperature and length of storage time.

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To dive deeper into this subject, we spoke with David Bigley, our Heathrow facility workshop manager, and he had this to say regarding the importance of considering the routine maintenance of an aircraft's battery:

"Typically, an aircraft battery is given a 90-day serviceable life, and within those 90 days, it can be fitted to an airframe. Beyond that 90 days, it has to go through a top charge in order to be operationally viable."

Now, this 90-day threshold can vary depending on the advice of the battery provider. However, it may be essential to consider that we are currently experiencing an unprecedented lack of aircraft service.

"It could be that current battery serviceability recommendations are based on new battery performance, it really depends on the battery provider," David Bigley goes on to explain. "However, there are some aircraft out there operating with aircraft batteries that are over a decade old. While still in operational condition, it's probably best to err on the conservative side when it comes to the maintenance of these aircraft batteries. 

In the period we are currently in, we are consistently getting a proportionally higher volume of discharged batteries. We believe that operators must be diligent about their aircraft battery maintenance during this time, we could see a lot of airlines trying to start their aircraft and nothing happens–because the batteries are below capacity."

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Battery age and type

Including whether you have stored old or new aircraft batteries, there is also another factor that needs to be considered. What type of aircraft battery is it? 

All batteries are subject to laws of entropy and will begin to self-discharge as they sit idle, whether Ni-Cd (nickel-cadmium), Li-ion (Lithium-ion), or lead-acid, but differ considerably in replacement cost. Li-ion can run almost five times the price of a Ni-Cad, with Ni-Cad still factoring in the thousands of dollars.

"95% of civilian platforms are running Ni-Cad," explained David Bigley. "The only Li-ions that we deal with are the A350 and the Boeing 787. Ni-Cad tends to be more robust, whereas Li-ion has greater power output. Regardless, both are subject to losing their changer as they sit.

The main takeaway that airlines should consider is this: Before they go back into service, aircraft batteries always need to be maintained and re-certified. And since none of us knows how long this lockdown will last, if airlines maintain their current batteries properly during this period, then they will have to buy less new ones when the aircraft can once again re-enter service."

Our final thoughts

We are currently in an unprecedented situation, where aircraft and their batteries are sitting idle for a much longer time than they were intended to. While factors regarding how often to recharge, repair or replace those batteries are subject to factors such as age, type, and OEM recommendations, it is important to remember that we still have no indication on just how long the majority of aircraft will be grounded for. While you could play off the guidelines specific to your aircraft's battery, it may be more advisable to err on the side of cautious and have your aircraft batteries routinely checked and serviced so as to prolong their life through this lockdown period.

You can follow this link here to learn more about the about our specific battery services, or you can go directly to our Satair Market to procure the batteries that you need to get your aircraft back in the air.

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About this blog

This blog is driven by Satair Marketing & Communication with input from both internal and external contributors.