Commercial Fixed Wing
Maintenance Airframe; Maintenance Powerplant
Time Pressure; Situational Awareness; Human-Machine Interface; Distraction; Communication Breakdown; Workload
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Maintenance; Deviation / Discrepancy - Procedural Published Material / Policy
Aircraft Aircraft Damaged; General Maintenance Action
Aircraft; Environment - Non Weather Related; Human Factors; Procedure
I was the Crew Chief on Aircraft X the morning of Date. The incident occurred [at] approx XA:00. The aircraft was on jacks for a test and while being lowered the aircraft made contact with the aft stabilizer. I was in the OTS (Out Of Service) office when I was notified of the incident.The aft stabilizer was not lowered fast enough to accommodate the lowering of the aircraft.Remove the stabilizer before down jacking.
DATE XA:00 Hrs. OTS Hangar Bay 1 Aircraft X. After aircraft jacking operation for inspection; tail stand was used. The lowering of the tail jack stand was slower than the main wing jacks. The tail engaged the jack; the jack screw tension and aircraft weight prevented lowering disengagement. I yelled 'Stop'. The rest of the crew stopped after my call was confirmed. Then I heard the noise. Then I yelled 'Up' and the crew began lifting the airplane. I disengaged the jack at the tail and removed it entirely. We visually inspected and saw the wavy skin.I heard from other crew chiefs that the tail stand should not be under the airplane during lifting and lowering.
Technicians reported communications difficulties and failure to adhere to AMM procedures caused aircraft damage during down jacking after hangar maintenance.