An airplane engineer performing maintenance on a Berlin-bound flight at Amsterdam's Airport Schiphol appeared to be applying duct tape to the engine, according to a concerned passenger on Tuesday.

The passenger, who recorded the incident, claimed the pilot delayed the flight due to a "minimal technical fix" before the repairman was called in, The Sun reported. The passenger filmed the engineer climbing onto the engine and removing what appeared to be old duct tape, then replacing it with a new strip.

"[During] the flight, the duct tape got slightly loose and rolled backward due to the speed," the person who recorded the video wrote online. "It really seems that the tape was there for mechanical reasons and not just for the looks, also, it seemed that the flight did not take place at full height."

The passenger said the pilot inspected the engineer’s work mid-flight.

''The pilot checked the fix, via switching on the lights, while the machine was in the air," the passenger wrote. "Whilst disembarking the plane, the turbine that still was moving due to strong winds made a ticking noise.''

A spokesperson for EasyJet, in a statement, said that high-speed metallic tape is in accordance with plane regulations and is often used to make minor repairs until permanent repairs can be made.

"EasyJet occasionally uses this high speed metallic tape, which is always used in accordance with the approved aircraft manuals and repair processes, and in no way compromises the safety of the aircraft. The safety and well-being of passengers and crew is always EasyJet’s priority," the statement read.

High-speed metallic tape is described as durable, able to expand and endure extreme temperatures for long periods of time during flight. It is commonly used on air crafts and race cars and is resistant to water, fire and UV light.