![]() Of importance is that the airspeed is NOT protected in certain modes. If CWS remains engaged, the aircraft will continue at this attitude. Pitch and roll follows the FD bars and speed is 240 KIAS with altitude set to flight level 20900. FMA displays CWS R & CWS P, vertical speed is 2650 and pitch mode is V/S after changing from TOGA thrust following climb out. LEFT: PFD with CWS engaged during climb following flaps retraction. Furthermore, CWS also allows for greater control of the aircraft when performing touch and goes and circuits at lower altitudes.ĬWS is often used during the climb to altitude with the autopilot being engaged at 10,000 feet. Being able to ‘feel’ the control surfaces through the yoke and column has obvious benefits that flying using the MCP cannot convey.ĬWS is also advantageous when flying in turbulent conditions (additional information below) as it results in smoother transitions than when the autopilot is used. As such, an obvious advantage of using CWS is that you do not have to continually apply positive pressure to the flight controls to maintain a set pitch or roll attitude.ĬWS enables you to fly the aircraft using the flight controls rather than turning the heading knob on the Mode Control Panel (MCP) or configuring other modes such as Level Change, Vertical Speed, VNAV, etc. The control pressures on the flight controls are in the order of 37 pounds push/pull value +- 3 pounds and continually applying this pressure for a protracted period of time can be tiring. Follow the manually flown procedure but instead of disengaging the autopilot, engage CWS.’ĬWS is a similar system to the ‘Fly By Wire’ system utilised by Airbus. ‘Control Wheel Steering (CWS) may be used to reduce pilot workload. The Flight Crew Training Manual (FCTM) states: When control pressure is released, the autopilot holds the existing attitude until CWS is disengaged, or the autopilot is engaged. The control pressure is similar to that required for manual flight. Each of the four press to engage buttons has a green annunciator which illuminates when the mode is engaged. The CMD and CWS buttons are located on the First Officer side of the MCP. LEFT: B737 Mode Control Panel (MCP) showing location of CWS buttons on Collins MCP. When engaged, CWS maneuvers the aircraft in response to control pressures applied to the control wheel or column. Broadly speaking, it is a sub-set of the autopilot system which can used on either System A or B. ![]() Please consider sending a few dollars ( Thank You.)ĬWS is an acronym for Control Wheel Steering. All funds donated will be used to offset the cost of server and website hosting. ![]() Maintaining this website costs a considerable sum of money each year. The definition of the acronym OEM is Original Equipment Manufacturer ( aka real aicraft part). I use the words 'modules & panels' and 'CDU & FMC' interchangeably. ![]() Do not complain if you do not like what you read. All reviews and content are 'frank and fearless' - I tell it as I see it. Note: I have NO affiliation with ANY manufacturer or reseller. I hope there are not too many spelling and grammatical mistakes.Īrticles are updated from time to time as procedures and information change. Writing for a cross section of readers from differing cultures and languages with varying degrees of technical ability, can at times be challenging. The purpose of FLAPS-2-APPROACH is two-fold: To document the construction of a Boeing 737 flight simulator, and to act as a platform to share aviation-related articles pertaining to the Boeing 737 thereby, providing a source of inspiration and reference to like-minded individuals. ![]()
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