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Warranty Reserves
 12 Months Ended
Apr. 30, 2021
Warranty Reserves  
Warranty Reserves

10.           Warranty Reserves

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Warranty reserve activity is summarized as follows:

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April 30,

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2021

    

2020

 

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(In thousands)

 

Beginning balance

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$

2,015

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$

1,704

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Warranty expense

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1,650

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2,258

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Changes in estimates related to pre-existing warranties

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—

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(189)

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Warranty costs settled

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(1,324)

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(1,758)

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Ending balance

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$

2,341

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$

2,015

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During the fiscal year ended April 30, 2019, the Company revised its estimates based on the results of additional engineering studies and recorded incremental warranty reserve charges totaling $491,000 related to the estimated costs to repair a component of certain small UAS that were delivered in prior periods. During the fiscal year ended April 30, 2020, the Company revised its estimates based on the results of additional engineering studies to $302,000. As of April 30, 2020 and 2019, the Company had no remaining warranty reserve related to the estimated costs to repair the impacted UAS and $251,000, respectively. During the fiscal year ended April 30, 2020, the Company incurred total costs related to this warranty of $288,000.