Aircraft Engine Malfunction Investigation

In Hong Kong, investigators examine Cathay Pacific flight 7802's engine issues. They retrieve the black box to analyze flight data, revealing that the thrust levers moved but fuel flow remained constant, indicating a metering valve malfunction. The valve, sent to Rolls-Royce for analysis, was found coated with a super absorbent polymer used in refueling trucks to prevent water contamination. This polymer, when in contact with water, forms a gel, which should remain in the filter but somehow ended up in the aircraft's fuel system.

What was the initial step taken by investigators in Hong Kong to understand the engine malfunction?

• Retrieving the black box flight data recorder

• Interviewing the pilots

• Inspecting the aircraft's exterior

• Consulting with Rolls-Royce engineers

What unusual observation did investigators make regarding the engine's fuel flow?

• Fuel flow was increasing rapidly

• Fuel flow was decreasing steadily

• Fuel flow was erratic and unpredictable

• Fuel flow remained constant despite thrust lever movement

What component was identified as unresponsive, leading to the engine issue?

• Main metering valve

• Fuel pump

• Engine turbine

• Throttle lever

Where was the main metering valve sent for further analysis?

• Airbus

• General Electric

• Rolls-Royce

• Boeing

What was discovered coating the walls of the metering valve?

• Metal shavings

• Oil residue

• A strange white substance

• A layer of rust

What did the x-ray analysis reveal about the white substance?

• It was a form of corrosion

• It was a type of lubricant

• It was a super absorbent polymer

• It was a type of metal alloy

What is the primary function of the super absorbent polymer found in the valve?

• To prevent water from entering aircraft fuel tanks

• To enhance fuel efficiency

• To lubricate engine components

• To increase engine power

Where is the super absorbent polymer supposed to remain during the refueling process?

• In the aircraft's fuel tank

• In the aircraft's fuel lines

• In the refueling truck's filter

• In the engine's combustion chamber

What was the unexpected outcome of the polymer's presence in the aircraft?

• It led to engine malfunction

• It caused the engine to overheat

• It had no effect on the engine

• It improved engine performance

What was the main mystery the investigators needed to solve?

• How the polymer reduced engine noise

• How the polymer ended up in the aircraft's fuel system

• How the polymer increased engine power

• How the polymer improved fuel efficiency