to an increase in acquisition-related expenses of $6.5 million associated with the acquisitions of Arcturus UAV, ISG and Telerob, and an increase in intangible amortization expense of $2.8 million.
Other expense, net, for fiscal 2021 was $8.9 million, as compared to other income, net of $5.5 million for fiscal 2020. The increase in other expense, net was primarily due to a legal accrual related to our former EES business, a decrease in interest income due to a combination of a decrease in the average interest rates earned on our investment portfolio and a decrease in the average investment balances, and an increase in interest expense of $0.9 million resulting from the term debt issued concurrent with the acquisition of Arcturus UAV.
Provision for income taxes for fiscal 2021 was $0.5 million, as compared to $5.8 million for fiscal 2020. The decrease in provision for income taxes was primarily due to a decrease in income before income taxes and an increase in certain federal income tax credits.
Equity method investment loss, net of tax, for fiscal 2021 was $10.5 million, as compared to $5.5 million for fiscal 2020. Equity method investment loss, net of tax, for fiscal 2021 included a loss of $8.4 million for our proportionate share of the HAPSMobile Inc. joint venture’s impairment of its investment in Loon LLC.
Net income attributable to AeroVironment for fiscal 2021 was $23.3 million, as compared to $41.1 million for fiscal 2020. Fiscal 2021 included the impairment loss of $8.4 million related to HAPSMobile Inc.’s investment in Loon LLC and a $9.3 million legal accrual related to our former EES business.
Earnings per diluted share from continuing operations attributable to AeroVironment for fiscal 2021 was $0.96, as compared to $1.72 for fiscal 2020. Fiscal 2021 included the impairment loss of $8.4 million related to HAPSMobile Inc.’s investment in Loon LLC and $9.3 million related to a legal accrual related to our former EES business.
Non-GAAP earnings per diluted share from continuing operations was $2.10 for fiscal 2021, as compared to $1.84 for fiscal 2020.
BACKLOG
As of April 30, 2021, funded backlog (remaining performance obligations under firm orders for which funding is currently appropriated to us under a customer contract) was $211.8 million, as compared to $208.1 million as of April 30, 2020.
FISCAL 2022 — OUTLOOK FOR THE FULL YEAR
For fiscal year 2022 the Company continues to expect revenue of between $560 million and $580 million, net income of between $32 million and $37 million, adjusted EBITDA of between $105 million and $110 million, earnings per diluted share of between $1.31 and $1.51 and non-GAAP earnings per diluted share, which excludes acquisition-related expenses and amortization of intangible assets, of between $2.50 and $2.70.
The foregoing estimates are forward-looking and reflect management's view of current and future market conditions, subject to certain risks and uncertainties, and including certain assumptions with respect to our ability to efficiently and on a timely basis integrate our acquisitions, obtain and retain government contracts, changes in the timing and/or amount of government spending, changes in the demand for our products and services, activities of competitors, changes in the regulatory environment, and general economic and business conditions in the United States and elsewhere in the world. Investors are reminded that actual results may differ materially from these estimates.
CONFERENCE CALL AND PRESENTATION
In conjunction with this release, AeroVironment, Inc. will host a conference call today, Tuesday, June 29, 2021, at 1:30 pm Pacific Time that will be webcast live. Wahid Nawabi, president and chief executive officer,