0000138900 00000 n Many products featured on this site were editorially chosen. 0000002942 00000 n This wake velocity can increase two or three times as the throttles are advanced and the airplane begins to taxi. There are four different categories, based on an aircraft's takeoff weight, the type of work being performed and the number of passengers it is configured to carry. MITRE is enhancing aviation's safety toolkit with an application designed to prevent pilots from taxiing onto a runway without permission, a scenario that poses an enormous collision risk. We normally accept these special taxi clearances without giving much thought to the safety considerations beyond the obvious one: that an airplane might be about to takeoff or land on a runway weve just been cleared to taxi onto. Proper effective scanning for other aircraft, surface vehicles, or other objects should be continuously exercised in all cases, At those airports where the U.S. Government operates the control tower and ATC has authorized noncompliance with the requirement for two-way radio communications while operating within the Class B, Class C, or Class D surface area, or at those airports where the U.S. Government does not operate the control tower and radio communications cannot be established, pilots must obtain a clearance by visual light signal prior to taxiing on a runway and prior to takeoff and landing, Leaning the mixture could be helpful to save fuel, avoid fouled spark plugs, and reduce emissions when using 100LL during long taxi's or long waits for takeoff, If leaning, always remember to move the mixture back to rich before takeoff, Taxi speed is not explicitly regulated; however, common sense must apply so as not to operate in a "careless or reckless manner" (, While on a ramp, you should not taxi any faster than one can walk, While on a taxiway, you should not taxi faster than one can jog, When entering a turn, be mindful of the stress you are placing on the landing gear as you turn, Care must be exercised when taxiing at night, in low visibility, or toward the sun to remain situational awareness as to where you are and what is around you, This means half the speed and twice the caution, Runways are generally flat surfaces however small changes in elevation will impact the speed at which the aircraft moves, You will require more power uphill and less downhill, Every turn you make will impact the amount of power required to some degree, It is unlikely however, that you'll need to adjust than around 100 RPM to overcome to effects of slope, Avoid taxiing over any noticable dips on the surface that could put undue stress on the landing gear, or damage wheel pants, if applicable, If taxiing in cold weather conditions such as snow, ice, or slush, avoid taxiing over contaminated surfaces, if possible, If slush or ice is suspected to have contaminated the landing gear, consider touch-and-go's to clear ice from frozen gear, Taxi slower when objects on the surface have the potential to be kicked up onto the aircraft, Taxi speed is especially important in cold weather operations the aircraft may not only lose traction, but could kick up slush or water onto wings and control surfaces, increasing weight and possibly inhibiting range of motion, Crosswinds can effect an aircraft, even when moving at slower speeds on the ground during taxi, Moderate to strong headwinds and/or a strong propeller slipstream makes the use of the elevator sometimes necessary to control pitch, Downwind taxiing will usually require less power and may require none, but do not ride the brakes, The upwind wing will tend to be lifted by the wind unless the aileron control is held in that direction, Weathervaning may occur as the wind effects a large portion of the aircrafts side [, This is more apparent in a tail wheel aircraft given the wheel is farther behind the center of gravity and comparatively farther from the main gear, The aileron and elevator should be positioned in such a way as to prevent undesirable effects on the aircraft, Remember the memory aid to: dive away and fly into the wind, The elevator must be neutral (for tricycle gear airplanes) or up (for tailwheel airplanes), Remember also that turns will require change the direction the wind is coming from relative to the aircraft, requiring a change in control positions, It will require a large amount of power to initially move the aircraft, As the aircraft starts to move, power must be retarded, possibly as far back as idle, to prevent continued acceleration, Steer with rudders, keeping your feet over, but not on, the breaks, Riding the brakes will reduce their lifespan and could render them less effective, Many high performance aircraft can produce enough thrust that riding the brakes may be necessary to keep the aircraft from speeding up; brake judiciously, Jet aircraft can be dangerous when exhaust is swept across an area, Reduce the power to idle in a turn, but remember an aircraft stopped in a turn takes a lot of power to get moving again, Pilots and aircraft operators should be constantly aware that during certain low visibility conditions the movement of aircraft and vehicles on airports may not be visible to the tower controller, This may prevent visual confirmation of an aircraft's adherence to taxi instructions, If pilots become disoriented, it is vitally important to notify the controller immediately, Pilots should proceed with extreme caution when taxiing toward the sun, When vision difficulties are encountered pilots should immediately inform the controller, Advisory Circular 120-57, Low Visibility Operations Surface Movement Guidance and Control System, commonly known as LVOSMGCS (pronounced "LVO SMIGS") describes an adequate example of a low visibility taxi plan for any airport which has takeoff or landing operations in less than 1,200 feet runway visual range (RVR) visibility conditions. b. never tow the aircraft while any of its engines are operating. Type I fluids have a high glycol content and a low viscosity; however, they are always applied diluted and heated. Aircraft structural 7 ways to minimize aircraft towing damage - RTITB A technical crew was repositioning the aircraft in visual meteorological conditions during the occurrence. If this slush is not cleared prior to take-off, it may freeze in flight. would place the airport diagram chart where it could be easily referred to during Hazard identification is the process used to identify hazards.. ICAO Requirements. Deicing for Safe Taxiing. A great flight instructor of mine once told me, You can either have power in or use the brakes, but you cant do both because that just doesnt make any sense. He was right. Manual: "When approaching the holding In the cockpit, complexity and workload will increase. 0000041909 00000 n These include: inappropriate use of a restricted taxiway - some taxiways are restricted by wingspan. times greater than the chance of striking another aircraft in flight. Nevertheless, because of their high viscosity, Type II, III, & IV fluids may continue to adhere to some parts of the aircraft during rotation and take-off. on the side window frames. The student had left the flaps down after pre-flight and taxied to the runup area without retracting them. Towards a more sustainable ground traffic management. "non-holding side.". High noise levels that might cause hearing damage. Continue searching. A selection of events that involved an aircraft being towed: On 27 September 2017, an Airbus A320 being manoeuvred off the departure gate at Dublin by tug was being pulled forward when the tow bar shear pin broke and the tug driver lost control. In this article Keep a constant vigil on the state of your anti-icing protection during ground operations in active freezing precipitation. Checklists and nonessential communication should be withheld until the aircraft is stopped and the brakes set, If the pilot is unfamiliar with the airport or for any reason confusion exists as to the correct taxi routing, a request may be made for progressive taxi instructions which include step-by-step routing directions, Progressive instructions may also be issued if the controller deems it necessary due to traffic or field conditions (for example, construction or closed taxiways), The need for progressive taxi can be mitigated by proper preflight planning and having airport diagrams handy, The use of takeoffs-and-landings/taxi lights is an effective means of illuminating surface hazards during taxi movements at night and alerting all concerned of an aircraft's presence/position in flight, Lights may be turned off under certain conditions whereby safety is still the primary focus, Examples would be when taxiing toward or yielding too other aircraft or in a ramp setting with adequate ambient lighting, A low visibility taxi plan will exist giving the pilot additional instructions when the RVR is less than 1,200' and again in operations less than 600' RVR, Do not switch frequencies while taxiing, in case ground needs to contact you, Auto-switch tower when approaching the hold short to monitor traffic, If you have just cleared a runway and are looking to taxi, call with intentions as appropriate, Exit without delay at the first available taxiway or as instructed, Personnel must always be aware of the dangers associated with moving surfaces, Rotor wash created by the blades of a rotary-winged aircraft or thrust from the exhaust section of a fixed-winged aircraft may cause severe personnel injury, The proper safety equipment must always be worn when working on flight decks and flight lines, Aircraft with conventional landing gear (tailwheel/draggers) aircraft have special considerations that are unique to them, The center of gravity of a tailwheel aircraft is behind the cockpit which can cause instability during taxi, Make smooth inputs on the controls and be mindful that the center of gravity is not allowed to get to the side of the aircraft with enough momentum to carry it around, Once a ground loop has started there is no way to get out of it until it has run its course, In the interest of avoiding obstacles or staying on a paved surface however, differential breaking with the inside break will tighten the loop, While speed can be a contributing factor to ground loops, it is also necessary to maintain positive control, If the aircraft is taxiing too fast, and breaks are applied too firmly, the tail can raise causing the tailwheel to lose effectiveness while simultaneously causing the propeller to move closer to the ground, If the tail comes up high enough, the pilot may experience a propeller, or "prop" strike, Flight Personnel are utilized on many aircraft ramps to direct traffic in an orderly fashion in accordance with local procedures [, Flashing your landing/taxi lights at the marshaller will help signal when you are ready, especially at night, Likewise, don't blind them with the light, turn it off until clear of the marshaller, Night: Flashlight moved vertically up-and-down repeatedly, Night: Flashlight moved horizontally back-and-forth repeatedly, Day: One arm pointing up with the other pointing down, Night: Same signal as day, but with lights, Day: Point to engine OR indicate engine number with fingers while making horizontal circular motion above head with other, Day: Move arms outward with thumbs pointed outward, Day: The direction of turn is indicated by that arm pointing downward while the other gestures to come closer, Day: Flagman holds hands in air to catch the pilot's attention, Day: With palms facing down, arms are moved up and down at side, Day: Move arms inward with thumbs pointed inward, Day: A cutting motion with a flat palm is made across neck, Day: Hand cupped behind ear as if listening, Day: Hand waved back and forth in an erasing motion in front of face, with palm turned forward, Night: Trace of letter N, given by external light, Fingers held vertically indicate 1 through 5, Fingers held horizontally indicate 6 through 9, Forgetting to remove a tie-down or chocks prior to attempting movement, Improper aileron deflection, particularly after turning, Taxiing with a power setting that requires controlling taxi speed with the brakes, To determine that the applicant exhibits satisfactory knowledge, risk management, and skills associated with safe taxi operations, including runway incursion avoidance, References: FAA-H-8083-2, FAA-H-8083-3, FAA-H-8083-25; POH/AFM; AC 91-73; Chart Supplements; AIM, The NTSB determines the probable cause(s) of this accident to be: The student pilot's failure to maintain a visual look out while transitioning from the active runway to a taxiway resulting in an on-ground collision with a taxiway sign, The NTSB determines the probable cause(s) of this accident to be: The pilot's failure to maintain clearance from a parked airplane during taxi operations at night, Taxiing is part of every flight, and it should be part of planning, ATC clearances or instructions pertaining to taxiing are predicated on known traffic and known physical airport conditions, Since "the pilot-in-command of an aircraft is directly responsible for, and is the final authority as to, the operation of that aircraft" the pilot should obtain clarification of any clearance or instruction which is not understood, Therefore, it is important that pilots clearly understand the clearance or instruction, Although an ATC clearance is issued for taxiing purposes, when operating in accordance with the CFRs, it is the responsibility of the pilot to avoid collision with other aircraft, In addition to conducting taxi operations as a maneuver, pilots must also be familiar and comply with all, Pay attention when in a movement area and be cognizant of expectation bias, that is having a belief you are prepared for what lies ahead and not pay attention to what is different, such as an atypical location for a runway hold position marking, When it comes to hand and arm signals, variations may exist, If any questions come up while taxiing, stop, and try to get clarification before proceeding, When taxiing and determining wind direction, make sure you account for the resultant wind, Consider the use of heading bugs to remember where the wind is coming from and/or to remember the assigned takeoff direction, Consider the use of a heading indicator course indicator to supplement, While it is best practice to always apply taxi corrections, regardless of wind velocity, it is imperative these corrections be used any time you can feel even the slightest movement in the yoke, During ground operations, jet blast, prop wash, and rotor wash (types of thrust stream turbulence) can cause damage and upsets if encountered at close range, Pilots should consider the effects of jet blast, prop wash, and rotor wash on aircraft, vehicles, maintenance equipment, and open structures (i.e., hangars) during ground operations, Additional resources are available through tools such as the FAA's, Remember when parking, to park in such a way to avoid inevitable jet blast (especially from larger aircraft), use tiedowns, and install control locks or covers as appropriate, Don't be afraid to practice if you need it, Different aircraft require different skills and even experienced pilots in, As pilots upgrade into larger aircraft, taxiing may be accomplished by the use of a tiller, vs. rudder pedals. be delivered at the gate instead of during taxi-out? You may be able to lift off the runway in ground effect but be unable to climb. The use of takeoffs-and-landings/taxi lights is an effective means of illuminating surface hazards during taxi movements at night and alerting all concerned of an aircraft's presence/position in flight . Investigation process: Transportation Safety Board, Investigations: Transportation Safety Board, Annual Report to Parliament 2016-17: Transportation Safety Board, Aviation occurrence statistics: Transportation Safety Board, Aviation occurrence and aircraft data (January 2004present): Transportation Safety Board, Air transportation safety concerns and advisories, Responses to aviation safety recommendations, transportation-related measures and guidance. This AC and its appendices provide guidance to airport operators about developing training programs for safe ground vehicle operations, personnel taxiing or towing an aircraft, and pedestrian control on the movement and safety areas of an airport. The possibility of fire, especially during engine starting. 0000005441 00000 n Reports a Be certain you are using the correct fuel, properly ground the aircraft and refueling unit, and protect the aircraft surfaces from hose and nozzle damage. Adherence to these procedures has led to an accident free record for large aircraft commercial operations since the early 1990s. . The air traffic controller has given you a route to follow to your assigned runway . Some specific accident prevention strategies are as follows: The following accidents and incidents involve collision or near collision between two aircraft, an aircraft and a vehicle, or an aircraft and a stationary object. Always conduct a pre-takeoff check for frozen contaminants just prior to take-off. The FAA is urging pilots to exercise increased vigilance when issued such clearances. Small general aviation aircraft should never use thickened fluids - especially Type II & IV but also Type III in most cases - because their rotation speeds are not high enough to completely shear the fluid off the wing. Its normally the pilot who requested a quick turn from the FBO after jamming on the brakes to make the mid-field turn off. The first step in all thorough aircraft towing procedures is ensuring you're using the proper ground support equipment (GSE). Same rule goes for taxiing in as taxiing out. "For an A320 with 3 take-off per day from Paris Roissy . According to the Airmen's Information 0000012070 00000 n The AC now addresses aircraft being taxied . Hazard Identification | SKYbrary Aviation Safety 0000040930 00000 n pilot must then challenge him/her to be sure that the clearance was understood. What procedure should be followed prior to starting a large radial engine to detect and/or prevent a hydraulic lock in the cylinders? Since movement on an airport's surface involves coordination, While the movement of the aircraft is our primary concern, there remain some, Finally, while taxiing seems straight forward, it can also be an art, with, Once your engine has started you must be aware of what you're doing and keep a visual scan, your "flight" has begun, It may be required initially to tow the aircraft before engines are started to be safe, Steering is accomplished with rudder pedals and brakes, The pilot applies the rudder in the desired direction of turn and use the appropriate power or brake to control the taxi speed, To tighten the turn after full pedal deflection is reached, the brake may be applied as needed, When first beginning to taxi, conduct a check of braking effectiveness, Release the brakes, and add power as required to allow the airplane to begin moving forward, Reduce the power to idle and depress the top portion of one side, then the other, to confirm proper function and reaction of both brakes, Be mindful of the area around you (in front, behind, and to the sides), especially if you're in a congested ramp, Checking brakes individually is ideal, but checking them together, if required, will suffice, Apply pressure sufficiently enough to cause the airplane to abruptly dip, or to a full stop if desired, If unsatisfactory, bring the airplane to a stop and consider taxi maneuvers (such as a loop) to maintain position on the airfield, To verify steering, depress the rudder pedal in the direction of turn desired, Verify that the airplane responds properly to the rudder pedal input, Make sure to check the braking and steering for each position that may need to use them (i.e., both seats), More engine power may be required to start the airplane moving forward, or to start a turn, than is required to keep it moving in any given direction, When using additional power, the throttle should immediately be retarded once the airplane begins moving to prevent excessive acceleration, The rudder pedal should be held in the direction of the turn until just short of the point where the turn is to be stopped, Rudder pressure is then released or opposite pressure is applied as needed, When stopping the airplane, it is advisable to always stop with the nosewheel straight ahead to relieve any side load on the nosewheel and to make it easier to start moving ahead, During crosswind taxiing, even the nosewheel-type airplane has some tendency to weathervane, However, the weathervaning tendency is less than in tailwheel-type airplanes because the main wheels are located behind the airplane's center of gravity, and the nosewheel's ground friction helps to resist the tendency, The nosewheel linkage from the rudder pedals provides adequate steering control for safe and efficient ground handling, and normally, only rudder pressure is necessary to correct for a crosswind, Downwind taxiing usually requires less engine power after the initial ground roll is begun, since the wind is pushing the airplane forward, To avoid overheating the brakes and controlling the airplane's speed when taxiing downwind, the pilot must keep engine power to a minimum, Rather than continuously riding the brakes to control speed, it is appropriate to apply brakes only occasionally, Avoid resting toes on the brakes, resulting in unnecessarily dragging the brakes, Other than sharp turns at low speed, the throttle should always be at idle before the brakes are applied, When taxiing at appropriate speeds in no-wind conditions, the aileron and elevator control surfaces have minimal effect on directional control of the airplane, These controls should not be considered steering devices and should be held in a neutral position, The presence of moderate to strong winds and/or a strong propeller slipstream makes use of the aileron and elevator necessary to maintain control of the aircraft's roll/pitch while taxiing, This becomes apparent when considering the lifting action that may be created on the horizontal tail surfaces by either of those two factors, The elevator control in nosewheel-type airplanes should be held in the neutral position, while in tailwheel-type airplanes, it should be held in the full aft position to hold the tail down, When taxiing with a quartering tailwind, the elevator should be held in the DOWN position, and the upwind aileron, DOWN, Since the wind is striking the airplane from behind, these control positions reduce the tendency of the wind to get under the tail and the wing and to nose the airplane over, When taxiing with a quartering headwind, the wing on the upwind side (the side that the wind is coming from) tends to be lifted by the wind unless the aileron control is held in that direction (upwind aileron UP), Moving the aileron into the UP position reduces the effect of the wind striking that wing, thus reducing the lifting action, This control movement also causes the downwind aileron to be placed in the DOWN position, thus a small amount of lift and drag on the downwind wing, further reducing the tendency of the upwind wing to rise, Clearances are required prior to moving an aircraft or vehicle onto the movement area during the hours an, The movement area is normally described in local bulletins issued by the airport manager or air, These bulletins may be found in FSSs, fixed base operators offices, air carrier offices, and operations offices, A clearance must be obtained prior to taxiing on a runway, taking off, or landing during the hours an Airport Traffic Control Tower is in operation, When assigned a takeoff runway, ATC will first specify the runway, issue taxi instructions, and state any hold short instructions or runway crossing clearances if the taxi route will cross a runway, This does not authorize the aircraft to "enter" or "cross" the assigned departure runway at any point, In order to preclude misunderstandings in radio communications, ATC will not use the word "cleared" in conjunction with authorization for aircraft to taxi, ATC will issue an explicit clearance for all runway crossings, If a pilot is expected to hold short of a runway approach/departure (Runway XX APPCH/Runway XX DEP) hold area or ILS holding position (see FIG 2-3-15, Taxiways Located in Runway Approach Area), ATC will issue instructions, ARTCC clearances are relayed to pilots by airport traffic controllers in the following manner, Normally, an ATC IFR clearance is relayed to a pilot by the ground controller. Paraphrasing FAR 121.542: "No certificate holder Wildlife hazards during approach and landing should be treated like any other flight safety hazardif any doubt exists concerning safety, delay your landing until conditions are right. What does the number 100 signify in 100LL aviation gasoline? %PDF-1.6 % Controllers - The ground controller is responsible for the safe and efficient movement of aircraft and vehicle traffic on the taxiways and aprons. Safe ground and taxiing procedures - Golf Hotel Whiskey Aviation accidents and investigations - Transport Canada Jet inlets while engines are operating. If a pilot fails to verbalize the clearance, the other 0000248922 00000 n decrease the threat of runway transgressions? While it's good to perform a brake check as part of your initial taxi, try your best to keep ahead of the airplane and use your brakes sparingly on the taxiway. 0000011457 00000 n Manage Settings Table 1 contains the standard taxi light signals used by control towers to control and expedite the taxiing of aircraft. No persons were injured and minor aircraft damage occurred. PDF AC 00-65 CHG 1 Final3 - Federal Aviation Administration shall require, nor may any flight crewmember perform, any duties during a contributed to the incident. Simulation results indicate that total taxiing time is reduced by 243s after optimization and no taxiing conflict occurs. 0000101315 00000 n Become throughly trained. that he became distracted when a Flight Attendant entered the cockpit to give Maximum danger comes when two aircraft are present on the same active runway at the same time, despite any late awareness of this circumstance on the part of either the controller(s . runway when another runway may be in use, and rushing. adequate separation from other aircraft at uncontrolled airports.". 0000152491 00000 n On occasion, however, minimum separation, particularly aircraft/vehicle separation is compromised. Do I call ground before starting the engine? salute from the ground crew. A couple of ASRS reports illustrate This prevention is dependant upon appropriate training and testing, compliance with clearances, published procedures and right-of-way rules, maintaining situational awareness and adapting speed of movement to suit the weather and surface conditions. Type IV fluids are designed for aircraft with take-off rotation speeds of 100-110 knots or more, and may be applied when substantial time is anticipated between deicing and take-off. The standard position for a signalman is slightly ahead of and in line with the aircrafts left wingtip. For anti-icing applications, this fluid may be applied undiluted. taxi. distractions contributed to their runway transgression. According to the FAA's Office of Safety Analysis, 0000041365 00000 n can be taken before leaving the ramp. inflammation of a tear gland: _______________________ itis. Examples include distractions xref Read reports on Transportation Safety Board investigations into specific aviation safety issues. Watch for obscured surface markings; snow and slush can obscure pavement markings and create a runway incursion hazard or cause you to taxi off the taxiway and onto a soft embankment. Taxi - Nasa Controlled movement of an airplane using its own power while on the ground. 0000002565 00000 n Use by a larger aircraft could compromise obstacle clearance, failure to follow taxi lane guidance - deviation from the lane guidance whilst manoeuvring in proximity to light stands, gates or stationary equipment can result in collision, jet blast -inappropriate thrust settings or following too closely can result in aircraft damage due to.
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