The exposition clause that contradicts the rule
You are a licensed aircraft maintenance engineer (AME) with airframe and powerplant ratings, working for a Part 145 maintenance organisation at a regional aerodrome. On Friday afternoon a Cessna 182 arrives for a magneto replacement. The engineer who removed the magneto has gone home sick, the work card is unsigned, and the engine timing check has not been recorded. The aircraft is booked on a parachute-drop flight at 0700 Saturday. Your maintenance controller tells you to issue the maintenance release anyway: "Our exposition, revision 7, clause 4.3.2 lets a controller release on a verbal report from the engineer who did the work, and AC 43-1 supports remote release. The CAA accepted the exposition, so the procedure must be legal." You have not seen the aircraft. The operator has had two recent ramp inspections and is anxious to fly. The controller is a senior person under the organisation's exposition and your direct supervisor.
1. Identify the sources of authority in play and explain whether the exposition clause makes the release legal.
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The hierarchy runs: Civil Aviation Act, then the Civil Aviation Rules made under it, then the organisation's exposition, then guidance material such as advisory circulars. A Part 145 exposition must be consistent with the rules; CAA acceptance of an exposition is not a waiver of a rule and does not convert an unlawful procedure into a lawful one. Advisory circulars explain an acceptable means of compliance - they are not law and cannot authorise a departure from a rule.
So the correct question is not "what does clause 4.3.2 say?" but "what does the rule require before a maintenance release may be issued?". Typically that is a person authorised under the rules and the organisation's system who has ensured the maintenance was completed in accordance with approved data, including any required functional or operational checks after a magneto change (timing, run-up, magneto drop check). A verbal report about work you have not seen, on an unsigned work card, does not meet that standard. If the rule genuinely permits release on the basis of another person's certification, the exposition must say how that is controlled; a bare verbal report usually will not.
2. What must be established and recorded before any maintenance release is signed in this case, and what do you do if the aircraft cannot be released?
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Before signing you need: (1) the work card completed and signed by the person who did the work, with the approved data referenced; (2) evidence the magneto was correctly installed - timing set to the engine data, harness security, and a satisfactory engine run and magneto drop check; (3) your own inspection of the installation, or supervision sufficient to satisfy the rule and the exposition; (4) any required duplicate inspection, especially where disturbance of engine controls or ignition could affect safety; (5) a logbook or maintenance record entry describing the work, the data used, the date, and the identity of the certifying person.
If those cannot be met before 0700, the aircraft is not airworthy and no maintenance release may be issued. The operator must be told plainly, in writing if possible, that the aircraft is unavailable, and the defect/status recorded. A special flight permit is not a fix for unfinished maintenance - it is for a specific flight (for example a ferry flight) with CAA approval and conditions, and would not be appropriate just to protect a booking. Record your refusal and the reasons in the organisation's system.
3. What should you do about the exposition clause and the pressure from the senior person, and what are the likely consequences?
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Do not sign. Tell the controller, factually and in writing, why the release cannot be made under the rule and ask for the work to be completed properly or for another appropriately authorised person who has actually seen the aircraft to certify it. Raise the exposition clause with the quality manager as a non-conformance: if the clause permits release without adequate evidence, it should be amended and the amendment submitted to the CAA through the organisation's exposition control process. A pattern of releases on verbal reports should be reviewed for the aircraft already released.
If the organisation insists on the practice, escalate to the senior person responsible for maintenance and, if it continues, to the CAA. Engineers are protected for reporting in good faith, but remaining silent while signing would make you personally responsible for a false certification - and licence action, not just employment consequences, can follow. Document the sequence of instructions and your responses; contemporaneous notes matter if the matter is later investigated. A ramp inspection that finds an unsigned work card and an unverified magneto installation would expose both the organisation and you.