Maintenance Release Signed by an Unauthorized Person
During a base maintenance check at a Part 145 organization, a licensed engineer completes a landing gear inspection and signs the maintenance release. The engineer holds an airframe and engine licence but the task requires a specific type rating endorsement that he does not hold for this aircraft type. The organization's quality manager discovers the gap during a records audit three weeks later. In the interim the aircraft completed nine revenue flights. The organization proposes to resolve the matter by having a correctly endorsed engineer review the work package retrospectively and sign a new release with the original date. The customer airline asks whether the nine flights were legal.
1. Analyze whether the nine flights were operated with a valid maintenance release.
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The validity of the maintenance release depends on the signatory's authorization for the task. If the engineer lacked the required type endorsement, he was not authorized to certify that task, and the release is defective regardless of whether the work itself was performed correctly. The nine flights therefore took place without a valid certification of the maintenance, which is a serious finding even if no defect existed.
The correct analysis separates the technical condition of the aircraft from the documentary certification. The aircraft may have been physically airworthy, but the regulatory basis for release to service was absent. The airline should treat the period as one requiring a formal assessment, and the authority should be informed through the occurrence reporting channel if the applicable rules require it.
2. Evaluate the organization's proposal to have an endorsed engineer sign a new release with the original date.
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The proposal is improper. A maintenance release is a contemporaneous certification by the person who performed or directly supervised and inspected the work. Backdating a release signed by someone who did not perform the work misrepresents the record and defeats the purpose of the certification. It converts a competence gap into a records falsification.
The proper route is a retrospective inspection and, where necessary, re-certification of the actual work by an authorized person, with the current date and an explicit notation of the circumstances. The organization should also assess whether the work itself meets the standard, since the original signatory's competence for this task is now in question. The corrective action should address how the task was assigned without a valid endorsement, not merely who signs the paper.
3. Recommend the human factors and authorization controls the organization should adopt to prevent recurrence.
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The organization should start with the assignment step. The planning or production control function should check licence and type endorsement against the task card before work is issued, so an unauthorized engineer cannot be assigned the task in the first place. A simple matrix linking task codes to required endorsements, maintained by the quality function, would have caught this case.
Second, the organization should examine why the engineer accepted the assignment. Possible contributors include schedule pressure, ambiguity about which tasks require the endorsement, and a culture in which raising a competence gap is uncomfortable. The quality manager should review the audit findings for similar near-misses and consider a non-punitive reporting route for authorization doubts. Third, the records audit should be frequent enough to detect a gap before nine flights occur; a three-week detection lag suggests the audit interval or sampling is inadequate for release documents.