cladding. A method of protecting aluminum alloys from corrosion by rolling a coating of pure aluminum onto the surface of the alloy. Cladding is done in the rolling mill.
clamp-on ammeter (electrical measuring instrument). A hand-held ammeter for measuring the amount of alternating current flowing in a circuit without opening the circuit.
The jaws of the ammeter are opened and slipped over the current-carrying wire and then clamped shut. The magnetic field caused by the current flowing through the wire induces a voltage in the ammeter jaws, proportional to the amount of current flowing in the circuit.
clamshell device. A mechanism having two doors which open on opposite sides of the device in the same way the shell of a clam opens. See clamshell thrust reverser.
clamshell thrust reverser (turbojet engine component). A thrust reverser that fits in the exhaust system of a turbojet engine.
In normal operation, the clamshell doors form a part of the tail pipe, but when the reverser is deployed, the doors move into position to block the normal tail pipe and duct the exhaust gases around so they flow forward to oppose the forward movement of the aircraft.
claret red. A dark or grayish purplish red to dark purplish pink.
class (aircraft classification). 14 CFR Part 1:
“(1) As used with respect to the certification, ratings, privileges, and limitations of airmen, means a classification of aircraft within a category having similar operating characteristics. Examples include: single engine; multiengine; land; water; gyroplane; helicopter; airship; and free balloon; and
(2) As used with respect to the certification of aircraft, means a broad grouping of aircraft having similar characteristics of propulsion, flight, or landing. Examples include: airplane; rotorcraft; glider; balloon; landplane; and seaplane.”
Class A airspace. Generally, that airspace from 18,000 feet MSL up to and including FL 600, including the airspace overlying the waters within 12 nautical miles of the coast of the 48 contiguous States and Alaska; and designated international airspace beyond 12 nautical miles of the coast of the 48 contiguous States and Alaska within areas of domestic radio navigational signal or ATC radar coverage, and within which domestic procedures are applied.
class-A amplifier (electronic amplifier). An electronic amplifier whose output current flows at all times. The output of a class-A amplifier has the same waveform as the input, but the amplitude of the output is greater.
Class A fire. A fire involving solid combustible materials such as wood, paper, and cloth as its fuel.
Class B airspace. Generally, that airspace from the surface to 10,000 feet MSL surrounding the nation’s busiest airports in terms of IFR operations or passenger emplanements. The configuration of each Class B airspace is individually tailored and consists of a surface area and two or more layers (some Class B airspace areas resemble upside down wedding cakes), and is designed to contain all published instrument procedures once an aircraft enters the airspace. An ATC clearance is required for all aircraft to operate in the area, and all aircraft so cleared receive separation services within the airspace. The cloud clearance requirement for VFR operations is “clear of clouds.”
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