The Ferry Permit That Outran the Airworthiness Certificate
A small charter operator holds a Cayman-registered Beech 1900C. Its Certificate of Airworthiness (C of A) lapsed on 3 March. The aircraft has been sitting at a remote airstrip since then after an engine change that was recorded in the logbook but never entered on the maintenance release. The operator wants to fly it 400 nm to its main base for a check, with two pilots and no passengers, on 19 March. The national civil aviation authority of the operator's principal place of business has issued a one-time ferry flight authorisation valid for 48 hours, subject to the aircraft being inspected by a licensed engineer before departure. The engineer signs off the engine installation but notes a corroded fuel line that he considers within limits. The flight is planned at FL180 through a neighbouring State's FIR. The operator argues that because the flight is non-revenue and the C of A is only suspended, no special permission beyond the ferry authorisation is needed.
1. Under the Chicago Convention framework, is the operator's position that no further permission is needed correct? Identify the specific articles and obligations that apply to the flight into the neighbouring State's airspace.
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The operator's position is wrong on two counts.
First, a lapsed C of A is not a C of A. Article 31 of the Chicago Convention requires every aircraft engaged in international navigation to be provided with a C of A, and Article 29 requires the certificate to be carried on board. A ferry authorisation from the State of Registry is a domestic permission; it does not substitute for the certificate for the purposes of Article 31. The correct mechanism is a special flight permit or equivalent issued under the State of Registry's airworthiness code, which some States accept as a valid substitute for a limited purpose. The operator should confirm with the registry authority that the ferry authorisation is framed as such.
Second, Article 5 (non-scheduled flights) allows aircraft of other Contracting States to fly over or land for non-traffic purposes without prior permission, but only where the flight is not for hire or reward and the State flown over retains the right to require prior authorisation. A 400 nm transit at FL180 is overflight for non-traffic purposes, so Article 5 may cover it - but many States have filed differences requiring prior permission for all flights, and the operator must check the neighbouring State's AIP and any Article 38 difference.
Third, Article 32 requires flight crew to hold licences issued or rendered valid by the State of Registry. The two pilots must hold valid Cayman-issued licences with the appropriate type rating, and the State of Registry must have rendered them valid for the flight.
Finally, Article 33 obliges the neighbouring State to recognise the C of A only if it was issued or rendered valid by the State of Registry and equals or exceeds the minimum standards. A ferry permit that is not a recognised airworthiness document may be rejected at the boundary, and the State flown over may require the flight to land or turn back. The correct course is to obtain written overflight permission and confirmation that the registry State treats the ferry authorisation as an Article 31 substitute before departure.
2. The engineer's sign-off notes a corroded fuel line 'within limits'. How should the pilot in command treat this, and what does the operator's maintenance release gap mean for the legality of the flight?
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The pilot in command is the final authority under Article 1 and Annex 2, but authority does not transfer airworthiness responsibility. The corroded fuel line is a known defect recorded at the point of dispatch. Annex 6, Part I requires the operator to ensure the aircraft is airworthy before flight and that defects are assessed under an approved maintenance control system. A defect the engineer has documented but not rectified must either be shown to be within the approved maintenance data (with the reference cited) or deferred under an approved deferral procedure with a defined rectification interval. 'Within limits' without a cited reference is not a deferral.
The maintenance release gap is more serious. Annex 6 requires a maintenance release to be completed before flight, recording the work done and certifying that the aircraft is airworthy. The engine change was logged but not released, which means the aircraft has been operating outside the approved maintenance system since the change. For the ferry flight, the release must be completed by an appropriately approved person before departure, and the ferry authorisation should name the engineer's scope of approval.
The pilot should refuse departure until: (a) the fuel line is either rectified or deferred under a documented approved procedure; (b) the maintenance release is completed for the engine change; and (c) the ferry authorisation explicitly covers the transit. If the operator pressures the pilot to depart, the pilot's refusal is protected, and the operator is exposed to enforcement action under the national regulations implementing Annex 6.