Maintenance Airframe; Maintenance Powerplant
Situational Awareness; Communication Breakdown
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy
General Maintenance Action
Aircraft; Chart Or Publication; Procedure; Human Factors; Company Policy
Supervisor failed to warn and inform mechanics assigned to aircraft that work was going to be performed. Failing to follow Job Card XXX4003; Step 7; A; (1) WARNING [notice]. The Supervisor was performing Job Card XXX4003; upgrade to CAT-2 scheduled Certification Check and turned on hydraulics without informing the mechanics working the airplane that this was going to happen; or that flight controls were going to move. Failure to notify personnel working the aircraft of potential movement of flight surfaces and other areas. Supervisor proceeded with Job Card and mechanics stayed away from any potential moving parts. [Recommend] following safety precautions outlined in the Maintenance Procedures and Job Card.
An Aircraft Maintenance Technician (AMT) reports that a Supervisor failed to warn and inform Maintenance personnel when he turned on a B737-400 aircraft's Hydraulic System and moved flight controls. Supervisor did not follow the 'Warning' notice in their Job Card prior to performing a scheduled CAT-2 upgrade Certification Check.