Aircraft engine maintenance provisions: accrued liability and revenue expenditure treatment for mandatory overhaul and inspection costs.

Maintenance obligations for aircraft engines under the Aircraft Act, 1934 and Aircraft Rules, 1937 can give rise to an accrued liability where periodic overhaul and hot section inspection are mandatory, reasonably estimable, and crystallised during the year, so the provision is not contingent merely because payment is deferred. Expenditure incurred to preserve and maintain an existing engine, without creating a new asset or enduring advantage, is revenue in nature even if the repairs extend useful life. On that basis, the provision for overhaul and inspection was deductible and the disallowance was unsustainable.

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Issues: (i) Whether the provision made for overhauling and hot section inspection of the aircraft engine was an allowable deduction as a liability that had accrued during the year, or a contingent liability; (ii) Whether the expenditure for overhauling and hot section inspection was capital expenditure or revenue expenditure.

Issue (i): Whether the provision made for overhauling and hot section inspection of the aircraft engine was an allowable deduction as a liability that had accrued during the year, or a contingent liability.

Analysis: The liability arose from the mandatory maintenance requirements under the Aircraft Act, 1934 and the Aircraft Rules, 1937, under which aircraft components had to be periodically inspected and overhauled after prescribed flying hours. On the facts, the assessee was obliged to incur the expenditure, the liability was capable of reasonable estimation, and it had crystallised during the year even though actual discharge took place later. A liability which is certain in principle and measurable with reasonable accuracy is not contingent merely because payment is deferred.

Conclusion: The provision was not a contingent liability and the deduction was allowable in principle.

Issue (ii): Whether the expenditure for overhauling and hot section inspection was capital expenditure or revenue expenditure.

Analysis: The expenditure was incurred only to preserve and maintain an existing aircraft engine and did not bring into existence a new asset or a new enduring advantage. The nature of the outlay was therefore maintenance-oriented and fell within the category of revenue expenditure, notwithstanding that the repair activity may have extended the useful life of the engine.

Conclusion: The expenditure was revenue expenditure and not capital expenditure.

Final Conclusion: The assessee was entitled to the deduction claimed on account of provision for aircraft engine overhauling and hot section inspection, and the disallowance was unsustainable.

Ratio Decidendi: Where a statutory or contractual obligation to incur maintenance expenditure has arisen with reasonable certainty and the outlay is for preserving an existing asset without creating a new asset or enduring advantage, the liability is not contingent and the expenditure is revenue in nature.

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