B737-800
Maintenance Powerplant; Maintenance Airframe
Human-Machine Interface; Troubleshooting; Situational Awareness; Communication Breakdown
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural FAR; Deviation / Discrepancy - Procedural Maintenance; Deviation / Discrepancy - Procedural Published Material / Policy
General Flight Cancelled / Delayed; General Maintenance Action
Human Factors; Aircraft; Incorrect / Not Installed / Unavailable Part; Procedure
Aircraft X arrived t the gate with the clamp missing on keel beam APU duct pressure seal. After further inspection; I found that the clamp had slipped off AND WAS NOT MISSING. The aircraft was taken out of service because of the lengthy time required to correct this issue. This can lead to potential pressurization issues and leaks. There have been several other aircraft seen with the same issue.
Technician reported aircraft arrived at station with the keel Beam APU pressure duct seal clamp not installed. The aircraft was taken out of service for maintenance action.