What is COF on Boeing 737? (Mkr Coffee Maker)

Have you ever wondered how pilots and cabin crew members manage to stay awake during long flights? Well, the answer lies in the incredible technology found onboard Boeing 737 aircraft. One of the fascinating features of this aircraft is the MKR Coffee Maker, also known by its abbreviation COF. Let’s delve into what exactly the MKR Coffee Maker is and how it enhances the flying experience for both the crew and passengers.

Enhancing Inflight Comfort: The MKR Coffee Maker

The MKR Coffee Maker is a state-of-the-art coffee brewing system installed onboard Boeing 737 aircraft. It is specifically designed to provide a quick and efficient way to brew high-quality coffee at cruising altitudes. With the MKR Coffee Maker, passengers and crew members can enjoy the aroma and taste of freshly brewed coffee, regardless of the duration of their flight.

One of the key challenges faced in brewing coffee at high altitudes is the reduced air pressure, which affects the boiling point of water. At cruising altitudes, the boiling point of water is significantly lower than at sea level, making it difficult to brew coffee using traditional methods. However, the MKR Coffee Maker overcomes this challenge by utilizing advanced technology to ensure that coffee is brewed at the ideal temperature and pressure, guaranteeing a perfect cup of coffee every time.

The MKR Coffee Maker on Boeing 737 aircraft is equipped with a high-pressure water pump that ensures the water reaches the ideal brewing temperature despite the lower air pressure. This pump is capable of producing pressures up to 19 bars, which is similar to the pressure used in professional espresso machines found in coffee shops. This high-pressure system allows the coffee grounds to be extracted effectively, resulting in a rich and flavorful brew.

Unmatched Convenience and Safety

In addition to producing delicious coffee, the MKR Coffee Maker offers unmatched convenience and safety features. The coffee maker is installed in the galley and can be easily accessed by crew members. It is designed to withstand the rigorous conditions of flight, ensuring that it operates smoothly and safely throughout the journey.

The MKR Coffee Maker also includes a built-in water filtration system, which guarantees that the water used to brew coffee is free from impurities. This ensures a consistent taste and quality of coffee, providing a satisfying and enjoyable experience to passengers and crew members alike.

Moreover, the coffee maker is equipped with automatic safety features to prevent any accidents or mishaps. It has a built-in overpressure valve that releases excess pressure to maintain the safety of the system. This valve ensures that the internal components of the coffee maker are protected and that the brewing process is carried out smoothly without any risks.


The MKR Coffee Maker on Boeing 737 aircraft is a remarkable piece of technology that enhances the inflight experience for both crew members and passengers. Its advanced brewing system overcomes the challenges of brewing coffee at high altitudes, delivering a perfect cup of coffee with an enticing aroma and robust flavor. With its convenience and safety features, the MKR Coffee Maker ensures that the brewing process is seamless and enjoyable throughout the flight.

Next time you find yourself aboard a Boeing 737 aircraft, take a moment to appreciate the ingenuity behind the MKR Coffee Maker and savor a freshly brewed cup of coffee at 30,000 feet above the ground!

For More: What is WPT on Boeing 737? (Waypoint)