Independent Inspection and Maintenance Release at Night
At 22:40, a line station with one B1.1 certifying staff receives a narrow-body twinjet with a hydraulic system low-pressure indication. The AMT replaces the engine-driven pump. The maintenance manual requires an independent inspection of the pump drive coupling engagement and a torque check after installation; the operational check is satisfactory. The replacement pump is an approved alternate part number with a valid release document, but the spares paperwork is in a different language and the AMT cannot read the serial-number traceability. The shift ends in 40 minutes, the next B1 staff is not available until 06:00, and the operator wants a maintenance release to fly a passenger sector. The AMT has not performed an independent inspection before and asks whether he can sign the certificate of release to service himself after his operational check.
1. Can the AMT issue the maintenance release himself in this situation? Explain the privilege and inspection issues.
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No. A B1.1 certifying staff member may certify maintenance only within the scope of the authorization and only when all required inspections and checks have been completed. An independent inspection is not a formality that can be replaced by the installer's operational check. The person who performed the pump installation cannot also act as the independent inspector for the same task if the manual requires an independent check.
The part documentation is a second blocker. An approved alternate part number still needs a valid release document and traceable serial number. If the AMT cannot read or verify the paperwork, he cannot confirm that the part is eligible and traceable. Signing the release would certify both the installation and the documentation, which he has not verified. The operational check being satisfactory does not cure either defect.
2. What must be completed before a release can be issued?
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First, a qualified and authorized independent inspector must inspect the drive coupling engagement and torque check and sign the inspection record. Second, the pump documentation must be verified: part number eligibility, alternate-part approval, release document, serial number and traceability. If the language is the only issue, a qualified person who can read it may verify it, but the AMT must not guess. If traceability cannot be established, the pump should be quarantined and another fully documented unit fitted.
The work order should show the installation, the independent inspection, the torque values, the operational check and the part verification. The maintenance release can then be issued by authorized certifying staff. An incomplete inspection cannot be hidden by a satisfactory ground run.
3. What operational options and records are appropriate if the inspection cannot be completed before the shift ends?
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The aircraft should not be released for the passenger sector. The AMT should notify maintenance control and the operator, record the incomplete independent inspection and the part-documentation hold in the work order, and leave the aircraft in a controlled state. Options are to call in another authorized inspector, delay the flight until 06:00, or replace the pump with a fully documented unit that can be inspected before the shift ends.
A required independent inspection is not an MEL deferral item. A ferry or special flight may be possible only under the applicable approval process, not by an ordinary line release. The record should identify who performed the work, what remains open, and what part documentation is missing. This protects the next shift and prevents an undocumented pump from entering service.