The 12-Year Engine Rule: South Africa Finally Moves from Calendar Time to Engine Condition
For years, South African general aviation has been caught in an awkward regulatory debate over the so-called 12-year engine rule.
An engine could have relatively low utilisation, a sound maintenance history and no obvious indication of an impending failure, yet the passage of twelve years could trigger a major maintenance requirement. For private aircraft owners, particularly those operating aircraft for relatively few hours each year, the financial consequences could be severe.
That situation has now changed.
The publication of the Thirty-Sixth Amendment to the Civil Aviation Regulations in Government Gazette No. 55226 on 21 August 2026 provides a regulatory basis for a Condition Monitoring Programme (CMP) under Parts 91 and 43. The change provides an alternative pathway for eligible privately operated, type-certificated piston aircraft to continue operating on condition, subject to the requirements of the programme.
It is best described as a move from calendar-driven maintenance towards condition-based continuing airworthiness.
And that is an important distinction.
An engine does not become safe simply because it is twelve years old.
Nor does it become unsafe simply because it is twelve years old.
The job of the maintenance system is to determine its condition, manage its risks and provide objective evidence that it remains airworthy.
That is ultimately what good aircraft maintenance management should be about.
