Normal operating sounds, Hummm Whoosh

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Normal operating sounds.

Newer refrigerators sound different from older refrigerators. Modern refrigerators have more features and use newer technology.

Do you hear what I hear? These sounds are normal.

HUMMM...

WHOOSH...

■The new high efficiency compressor may run faster

	and longer than your old refrigerator and you may	■ You may hear the fans spinning at high speeds.
	hear a high-pitched hum or pulsating sound while	This happens when the refrigerator is first plugged
	it is operating.	in, when the doors are opened frequently or when
	■ You may hear a whooshing sound when the doors	a large amount of food is added to the refrigerator
	■ You may hear a whooshing sound when the doors	or freezer compartments. The fans are helping to
	close. This is due to pressure equalizing within	or freezer compartments. The fans are helping to
	close. This is due to pressure equalizing within	maintain the correct temperatures.
	the refrigerator.	maintain the correct temperatures.
	the refrigerator.	■ If either door is open for over 3 minutes, you may
		■ If either door is open for over 3 minutes, you may
		hear the fans come on in order to cool the light
		bulbs.
		■ The fans change speeds in order to provide optimal
		cooling and energy savings.

CLICKS, POPS,

WATER SOUNDS

CRACKS and CHIRPS

■You may hear cracking or popping sounds when the

	refrigerator is first plugged in. This happens as the	■ The flow of refrigerant through the freezer cooling
	refrigerator cools to the correct temperature.
		coils may make a gurgling noise like boiling water.
	■ The compressor may cause a clicking or chirping
		■ Water dropping on the defrost heater can cause a
	sound when attempting to restart (this could take
		sizzling, popping or buzzing sound during the
	up to 5 minutes).
		defrost cycle.
	■ The electronic control board may cause a clicking
		■ A water dripping noise may occur during the defrost
	sound when relays activate to control refrigerator
		cycle as ice melts from the evaporator and flows into
	components.
		the drain pan.
	■ Expansion and contraction of cooling coils during
		■ Closing the door may cause a gurgling sound due to
	and after defrost can cause a cracking or popping
		pressure equalization.
	sound.

■After an icemaking cycle, you may hear the ice cubes

	dropping into the ice bucket.	For additional information on normal
	dropping into the ice bucket.	icemaker and dispenser operating sounds,
		icemaker and dispenser operating sounds,
		see the About the automatic icemaker
		and About the ice and water dispenser
		sections.

48, 42 specifications

The GE 42 and GE 48 are two state-of-the-art aircraft engines produced by General Electric, renowned within the aerospace sector for their advanced technologies and high-efficiency performance. These engines, designed primarily for commercial and military aviation, exemplify GE's commitment to innovation in the world of jet propulsion.

One of the distinguishing features of the GE 42 is its high bypass ratio, which allows for reduced fuel consumption and lower emissions during operation. This characteristic directly contributes to the engine's environmental efficiency, making it a favorite among airlines looking to minimize their carbon footprint while maximizing fuel economy. The GE 42 is equipped with advanced composite fan blades and fan cases, which contribute to its robust performance while maintaining a lightweight structure.

On the other hand, the GE 48 boasts similar high bypass ratio features but comes with slightly enhanced performance metrics suitable for larger aircraft. The GE 48 utilizes cutting-edge digital technologies, including predictive maintenance systems, enabling real-time monitoring of engine performance. This capability allows operators to make informed decisions about maintenance schedules and operational efficiency.

Both engines employ the latest in additive manufacturing, allowing for complex parts to be produced with a high degree of precision and reduced waste. This not only enhances performance but also lowers production costs, ensuring that GE remains competitive in the market. Additionally, both the GE 42 and GE 48 feature improved aerodynamics, with specially designed turbine blades that optimize airflow, thereby boosting overall efficiency.

The durability of these engines is another notable highlight. They are designed to withstand extreme operational conditions, ensuring reliability whether used for long-haul flights or military missions. Engine life extends through advanced materials that can endure high temperatures and stresses, making them suitable for various applications.

In conclusion, the GE 42 and GE 48 stand out in the aviation industry for their innovative technologies and characteristics. Their high bypass ratios, use of advanced materials, digital monitoring systems, and aerodynamic designs make them exemplary choices for modern aviation needs, catering to both commercial and military sectors while focusing on sustainability and performance. As aviation technology continues to evolve, these engines remain at the forefront, embodying the future of flight.