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aircraft taxiing hazards and remedy

To prevent slush from contaminating control surfaces, taxi at low speeds and steer clear of prop and jet wash that can blow slush onto control surfaces. They aren't just limited to minimize distractions during taxi-out? contributed to the incident. All comments made here are public and may be republished by Flying. Because runway surfaces In response, we have issued some transportation-related measures and guidance. Several others reported that the lack of conspicuous taxiway markings and signs contributed to a runway transgression. shall require, nor may any flight crewmember perform, any duties during a The A/S32A-37 aircraft towing tractor is an inline, 6-cylinder, diesel-powered, liquid-cooled, 4-wheel drive vehicle used to move heavy aircraft. 0000253140 00000 n Many products featured on this site were editorially chosen. Pilots tend to taxi faster on runways than taxiways, exacerbating this problem. Contact Ground Control or CTAF, as appropriate: State your aircraft identification, location, type of operation planned (VFR or IFR), if IFR, the point of first intended landing, if VFR, the cardinal direction, and that you have the appropriate ATIS/AWOS/ASOS code: Consider setting the heading bug/course indicator to display the takeoff direction. A few ASRS reports indicate that 0000247639 00000 n The air traffic controller has given you a route to follow to your assigned runway . 1 / 32 Controlled movement of an airplane using its own power while on the ground. In fact, the worst accident in aviation history occurred due to a runway transgression Figure 3 illustrates some of the most commonly used helicopter operating signals. 0000152886 00000 n Human Error in Aviation and Legal Process, Stabilised Approach Awareness Toolkit for ATC, Flight Deck Procedures (A Guide for Controllers), FA50 / Vehicle, Moscow Vnukovo Russia, 2014, Start-up, Push-back and Taxi - A Guide for Controllers, Visual Aids Handbook UK CAA CAP 637 (2007), ACRP Report 148: LED Airfield Lighting System Operation and Maintenance, failing to stop at a taxiway holding point, failing to stay on the surface movement control radio frequency or ground frequency as appropriate. 0000040930 00000 n But stop and consider this: the likelihood of a collision with another truck moved rearward no ground personnel were [visible to] the cockpit [crewmembers]. done safely requires planning, coordination, and attention. For information on COVID-19 updates, please visit Canada.ca/coronavirus. 0000261155 00000 n This ensures redundancy while critical taxi frame works fine. Always taxi with your nosewheel on the centerline of the taxiway. Aircraft taxiing in snow Ground Operations Flight Operations Watch for snow banks; snow piled alongside taxiways may present a collision hazard. What markings are required for a piston engine powered airplane? 0000033519 00000 n Five hundred and eighty-three souls perished in runway when another runway may be in use, and rushing. problems are quite serious. While most occurrences on airport aprons and taxiways do not have consequences in terms of loss of life, they are often associated with aircraft damage, delays to passengers and avoidable financial costs. Whether you're using aircraft recovery dollies or towbarless tugs, it's important to use the right GSE (with the right towing capacity) for the job. When towing an aircraft, should you use the tow vehicle or aircraft brakes to stop the aircraft? 0000057526 00000 n 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. A technical crew was repositioning the aircraft in visual meteorological conditions during the occurrence. 0000248773 00000 n We welcome your comments on flyingmag.com. 0000249761 00000 n The filler openings must be marked with the fuel grade and the word "AVGAS". Think about what distance it may take to roll to a stop if you were forced to pull the power and adjust your speed so this could be accomplished in a reasonable distance. 0000049616 00000 n Towards a more sustainable ground traffic management. "non-holding side.". 0000249406 00000 n Turning props, rotors, prop or jet blast and inlet areas. 0000152748 00000 n Spray the aircraft with Type I fluid that is diluted and heated to nominally 60C (140F) at the nozzle. Read reports on Transportation Safety Board investigations into specific aviation safety issues. 0000248407 00000 n When a piston comes up on its compression stroke, the incompressible liquid seizes it. Consult the procedures applicable to your aircraft and operation. In the cockpit, complexity and workload will increase. The deicing fluids and some of their characteristics are identified in the chart and the "Related Information" links on this page. basic as it may seem, a few ASRS reports indicate that some pilots have difficulty By enabling aircraft to turn off their engines during taxiing operations, the vehicle allows a reduction of noise emission and a reduction of fuel-burn and CO2 emissions up to 85% while improving air quality around airports as well. 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. 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. %PDF-1.6 % Taxiing is the movement of an aircraft on the ground, under its own power, in contrast to towing or pushback where the aircraft is moved by a tug, The aircraft usually moves on wheels, but the term also includes aircraft with skis or floats, An airplane uses taxiways to taxi from one place on an airport to another; for example, when moving from a startxref Complete the medical terms based on their meanings and the word parts given. (a) It is difficult to extinguish a fire on a crude oil . When applied hot, these fluids exhibit good deicing properties but provide very limited protection against refreezing in precipitation. Air carriers are urged to review Continue searching. In fact, more than a few aviation safety incidents or near misses have occurred simply while on the ground during a ground or taxiing procedure. This could affect the handling qualities of your aircraft. As previously stated, to ensure efficient and safe airport ground operations, separation between aircraft or between aircraft and vehicular traffic must be maintained and optimised. Les Instructions techniques pour la scurit du transport arien de marchandises dangereuses de l'Organisation de l'aviation civile internationale (IT de l'OACI), sont incorpores par renvoi dans le RTMD, ce qui fixe la rglementation pour le transport arien scuritaire de marchandises dangereuses tant l'chelle nationale qu . to dented wing tips and excursions through the grass, either. 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. b. never tow the aircraft while any of its engines are operating. Well-developed ground deicing/anti-icing methodologies and procedures have been established for the airlines. Definition. require aggressive braking by the aircraft which could result in personnel injuries. This ensures adequate lubrication on initial startup. In order to maintain a respectful environment, we ask that all comments be on-topic, respectful and spam-free. 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. Whenever these thickened fluids are applied, be sure to follow the manufacturer's recommended procedures for your aircraft, including procedures for operation of the engines and auxiliary power unit. For aircraft that aren't so equipped, a piece of masking tape in the window 0000041365 00000 n Runways are generally much wider than taxiways, and as a result seeing signs at their edge can be surprisingly difficult. to resolve complex problems it may be necessary to go back to basics. Pilots tend to taxi faster on runways than taxiways, exacerbating this problem. }OWaMJMqh2AqFQZ-`/g25\_ R{jxHL{. be delivered at the gate instead of during taxi-out? Click the card to flip Flashcards Learn Test Match Created by galaxystar7766 Terms in this set (32) Whats the definition of taxiing? If the signalman can see the pilots eyes, the pilot can see the signals. Light signals may be used when taxiing an airplane without a radio or when a radio becomes inoperative on a tower controlled airport. The following section provides detailed instructions on taxi signals and related taxi instructions. 0000012934 00000 n 0000026526 00000 n %PDF-1.4 % Only use Type II, III, & IV fluids with the approval of the aircraft manufacturer. 0000138386 00000 n Chapter 7 - Aircraft Structural Materials, Ch 017 - Aircraft Airworthiness Inspection, Ch 014 - Cabin Atmosphere Control Systems, Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer. are designed for takeoffs and landings, they are not marked for taxiing. that could be sucked into the prop or engine. Hazards Associated With Flying at Night Presented by Name Transport Canada, System Safety. The standard position for a signalman is slightly ahead of and in line with the aircrafts left wingtip. And as always, if you start to get an uneasy feeling about where you are or where youre supposed to go, ask the controller for clarification. of the aircraft. Critical phase of flight includes all ground operations https://studentpltnews-images.s3.us-east-2.amazonaws.com/wp-content/uploads/2018/05/05174018/702SP.jpg, https://flighttrainingcentral.com/wp-content/uploads/2022/01/FTC-logo-horizontal-fianl.png, Soft Field Takeoff HD Flight Maneuver Spotlight, Slow Flight HD Flight Maneuver Spotlight, Flight Start Helps Student Pilots Choose Their Path, Learn to Fly Month at Sportys begins Monday, May 1, Turns Around a Point Flight Maneuver Spotlight. All taxiing operations are performed in accordance with applicable local regulations. Same rule goes for taxiing in as taxiing out. Avgas contaminated by jet fuel must not be used in piston engines - the engine may be damaged or destroyed. Tug operators - Tug operators have the additional responsibility of moving aircraft on and off gates as well as positioning aircraft from one location on the airfield to another. What is the most generally used knot for tying down small aircraft? In fact, even experienced pilots may forget or become complacent about the remaining aspect of flying, that is, ground and taxiing procedures. Several pilots complained that cockpit Turning propellers and rotor blades. contribute to taxi distractions. Taxiways generally also have better signage and markings than runways, which can add to the confusion at an already confusing time. Sh/3R_\l/s`}$xzjh*d3>Y",^Y>@ TSdB$C-)ZetV % :`j@HTPrFL@we[e|TuJ!s|3Kv SJd>|GRHkHVd(MZkzI%(P6}Ylr IV]e MOgc5zCWBndn V. Continue cranking the engine to start it and suck the fire into the engine. This version represents a major rewrite. reduced aircraft clearance with ground equipment or obstacles. 0000248258 00000 n Which . situational awareness. Reproduction in whole or in part without permission is prohibited. Prior to starting a new engine or one that has been preserved for storage. Taxiways generally also have better signage and markings than runways, which can add to the confusion at an already. What markings are used for reciprocating engine-powered airplanes? Can I taxi to the end of the ramp without permission, or do I call before releasing the brakes? 0000152831 00000 n What procedure should be followed prior to starting a large radial engine to detect and/or prevent a hydraulic lock in the cylinders? Finally, it's suggested that the These include: inappropriate use of a restricted taxiway - some taxiways are restricted by wingspan. Ground deicing is typically accomplished in several ways. If the engine doesn't start and the fire continues to burn, discontinue the start attempt and extinguish the fire with a suitable fire extinguisher. Even something as routine as taxiing et@ dfcd1@ An idling airplane can produce a compact version of a Category 3 hurricane, introducing an engine wake approaching 120 mi/h (104 kn or 192 km/h) with temperatures of 100F (38C). We and our partners use cookies to Store and/or access information on a device. 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 . For general aviation, however, insufficient or improper ground deicing/anti-icing continues to cause several fatalities a year. Some taxi-related Describe the precautions that should be taken to protect life and property while starting and running an aircraft engine. Jet exhaust or propeller blast. a runway transgression occurred because the Captain did not hear the clearance poses its own set of potential safety-related problems. Same rule goes for taxiing in as taxiing out. Not so obvious is how handling may be affected by deicing fluids. Captain may not hear or comprehend "hold short" clearances. 0000005695 00000 n 0000061284 00000 n A jump seat rider observed: Another crew reported that they struck Oil seeps by the piston rings and accumulates in the combustion chamber of lower cylinders. On 21 August 2006, a Boeing 737-500 suffered a nose landing gear collapse during towing at the Newark Liberty International Airport. But as you probably know controllers will frequently instruct pilots to do just the opposite that is, use a runway as a taxiway. Speaker's Notes. six inches apart. Name at least three possible hazards that may be encountered during typical ground operations, such as during engine run-up or taxiing? 0000153136 00000 n 0000002743 00000 n 0000050029 00000 n aircraft-aircraft collisions or near collisions - collisions can result from: failure to follow taxiway centreline guidance, taxiing at speeds unsuited to the conditions or level of congestion, taxiway deviation whilst trying to manoeuvre to "squeeze" past another aircraft. distractions contributed to their runway transgression. 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. Reports a You're a solo pilot getting ready to take off from a busy airport. 0000050056 00000 n I was alerted to this unwritten rule when a Senior CFI wanted to give a student departing for a long cross country a hard time. can help flight crews make that taxi operation safer: Any pilot knows the danger of a midair Driving infractions should be investigated and additional training provided where appropriate. The SAE in conjunction with the FAA, Transport Canada, airlines, aircraft manufacturers, and producers of deicing fluids develop and publish specific procedures for aircraft ground deicing. 0000249961 00000 n hbbd```b``" R} Slide 1. Also, ensure that the prop or jet blast doesn't blow into hangars or other airplanes, and have a fire guard nearby. lines from the side with the continuous lines a pilot should not cross the holding 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. Aviation enforcement and processes, corporate and non-corporate offenders. The consent submitted will only be used for data processing originating from this website. The sample may have a cloudy or hazy appearance or a solid slug of water. 2175 0 obj <>stream Accident and investigation details, maps, information for media. 0000152491 00000 n loading flight management computers. Taxiing Technique Taxiing in a crosswind requires additional control inputs to keep the airplane's tires well planted and, in a strong crosswind, to prevent a wing or the tail of the airplane from being lifted by the wind. we hope to offer a few practical suggestions towards eliminating future taxi-related include distractions, blocked radio transmissions, a mindset to taxi to a particular 0000002942 00000 n Sometimes 0000101490 00000 n The aircraft may be treated with deicing/anti-icing fluids, placed in a heated hangar then sprayed with anti-icing fluid, or deiced via mechanical means with brooms, rubber scrapers, or forced air. Can checklists be rewritten Continue with Recommended Cookies. The AC now addresses aircraft being taxied . clearance is issued, the Captain and First Officer should repeat the hold short Therefore What are some of the possible outcomes of using a lower grade avgas than the specified grade? My own rule of thumb: if in doubt, over-communicate. For anti-icing applications, this fluid may be applied undiluted. is still off-frequency talking to the pushback crew on the interphone. This will affect the promulgation of procedures and the required qualification for those occupying the flight crew seats on the aircraft during the manoeuvre. pilots should be particularly alert when taxiing on runways. And its nothing to be ashamed of because its common and taxiing is not natural. to a runway transgression. Table 1 contains the standard taxi light signals used by control towers to control and expedite the taxiing of aircraft. pilots to call station operations to report "on the ground" after Have a qualified person in the cockpit, check the brakes, call "SWITCH OFF" before moving the prop, and make sure you have a solid footing. 0000042021 00000 n 0000012043 00000 n 0000249260 00000 n IF: You detect ice on your aircraft during the preflight inspection. 0000148135 00000 n Read recommendations for advancing aviation safety resulting from Transportation Safety Board investigations. (2) with main or nose gear having two flat tires on one axle. Hydraulic lock in radial engines. Read recommendations for advancing aviation safety resulting from Transportation Safety Board investigations. as: Another air carrier pilot reported Stay up to date with the latest articles and selections from our archives. The first step in all thorough aircraft towing procedures is ensuring you're using the proper ground support equipment (GSE). Off the centerline Always taxi with your nosewheel on the centerline of the taxiway. This is a critical safety issue and a legal requirement. And as [This led] to the assumption by the Captain that deicing had been completed." Taxiing in snow, slush, or ice presents several hazards. 0000248526 00000 n Taxiing Aircraft As a general rule, only rated pilots and qualified airframe and powerplant (A&P) technicians are authorized to start, run up, and taxi aircraft. The student had left the flaps down after pre-flight and taxied to the runup area without retracting them. Its normally the pilot who requested a quick turn from the FBO after jamming on the brakes to make the mid-field turn off. Become throughly trained. a deicing truck after beginning a premature taxi. What are the indications of water in aircraft fuel after draining a sample from the fuel sumps? While a national effort is underway to reduce runway transgressions, Reporting accidents and unsafe acts or conditions, information for first responders. of the two hundred twenty-four runway transgressions reported in 1991, forty-one An airport is a complex interface between the air and the ground environments, where access must be controlled and separation between aircraft or between aircraft and vehicular traffic must be maintained and optimised. Whilst all events do not result in collision with an aircraft, the majority of taxiway occurrences involve vehicle operators deviating from a surface movement controller clearance. Description. inflammation of a tear gland: _______________________ itis. 0000247480 00000 n Recall that holding lines lie perpendicular the Airmen's Information Manual states that when clearing a runway after landing, And is it really necessary to require Each year accidents, incidents, and runway incursions occur involving aircraft, pedestrians, ground vehicle drivers, and personnel taxiing or towing aircraft at airports. If this slush is not cleared prior to take-off, it may freeze in flight. salute from the ground crew. Copyright 2023 Flying Media. When taxi instructions are received from the controller, pilots should always read back: Any instruction to hold short of a specific runway or line up and wait, Controllers are required to request a read-back of runway hold short assignment when it is not received from the pilot/vehicle, The control tower also issues bulletins describing areas where they cannot provide service due to non-visibility or other reasons, This is usually done through ATIS/AWOS remarks, Begin taxi, monitoring ground frequency until into the run-up area, Exit the runway without delay, at the first available taxiway, or as instructed, All parts of the aircraft must be across the hold short line to be considered off the runway, When issuing taxi instructions to any point other than an assigned takeoff runway, ATC will specify the point to taxi to, issue taxi instructions, and state any hold short instructions or runway crossing clearances if the taxi route will cross a runway, ATC is required to obtain a read-back from the pilot of all runway hold short instructions, An essential requirement in conducting safe taxi operations is where the pilot maintains situational awareness, Depending on the airport, parking, ramp, and taxiways may or may not be controlled, The pilot should make themselves familiar with the parking, ramp, and taxi environment, Especially at unfamiliar airports, review, and have available the, If routing is expected to be complex, consider listening to ground control, if able, on, The pilot must be vigilant of the entire area around the airplane to ensure that the airplane clears all obstructions, If, at any time, there is doubt about a safe clearance from an object, the pilot should stop the airplane and check the clearance, It may be necessary to have the airplane towed or physically moved by a ground crew, When taxiing, the pilot's eyes should be looking outside the airplane scanning from side to side while looking both near and far to assess routing and potential conflicts, especially at intersections, It is helpful to use internal callouts to accomplish this task: ", The primary requirements for safe taxiing are positive control, the ability to recognize any potential hazards in time to avoid them, and the ability to stop or turn where and when desired, without undue reliance on the brakes, The pilot should accurately place the aircraft centered on the taxiway at all times, Some taxiways have above ground taxi lights and signage that could impact the airplane or propellers if the pilot does not exercise accurate control, When taxiing, the pilot must slow down before attempting a turn, Sharp high-speed turns place undesirable side loads on the landing gear and may result in tire damage or an uncontrollable swerve or a ground loop, Swerves are most likely to occur when turning from a downwind heading toward an upwind heading, In moderate to high-wind conditions, the airplane may weathervane increasing the swerving tendency, Good operating practice dictates that pilots acknowledge all runway crossing, hold short, or takeoff clearances unless there is some misunderstanding, at which time the pilot should query the controller until the clearance is understood, NOTE: Air traffic controllers are required to obtain from the pilot a read-back of all runway hold short instructions, Also, without clearance to cross a runway, you should never cross a red sign-think of it as a stop sign, Pilots operating a single pilot aircraft should monitor only assigned ATC communications after being cleared onto the active runway for departure. All taxiing operations are performed in accordance with applicable local regulations. %%EOF 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.

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aircraft taxiing hazards and remedy