- Industry: Aviation
- Number of terms: 16387
- Number of blossaries: 0
- Company Profile:
Aviation Supplies & Academics, Inc. (ASA) develops and markets aviation supplies, software, and books for pilots, flight instructors, flight engineers, airline professionals, air traffic controllers, flight attendants, aviation technicians and enthusiasts. Established in 1947, ASA also provides ...
A maintenance inspection that must be performed on a regular or recurring basis. Annual and 100-hour inspections are both periodic inspections.
Industry:Aviation
A maintenance manual issued by a manufacturer and approved by the FAA that describes, in detail, specific repairs that are approved for a particular aircraft structure.
Industry:Aviation
A maintenance procedure for an aircraft generator that restores residual magnetism to the field frame. DC generators get their field excitation current from the armature, and the field frame must retain a small amount of permanent magnetism to furnish the magnetic field to begin producing current in the armature. As soon as current begins to flow in the armature, it excites the field.
If the field frame loses its residual magnetism, it must be restored before the generator can produce current. This residual magnetism is restored by flashing the field. A battery is momentarily connected to the field coil so current flows through it in its normal direction for a few seconds. This current magnetizes the field frame.
Industry:Aviation
A maintenance procedure for discharging a battery that removes all the electrical energy from the battery before it is recharged.
When a battery is deep discharged, it is discharged at a specified rate until its voltage is down to a certain value, and then all the terminals of all the cells are connected with shorting straps and left shorted for a specified period of time.
Deep discharging puts all the cells in a battery in the same condition, ready to receive a new charge.
Industry:Aviation
A maintenance procedure in which a damaged component is restored to its original condition or at least to a condition that allows it to fulfill its design function.
Industry:Aviation
A maintenance procedure in which a turbine engine fuel control is adjusted. The idling speed and the high-end performance are adjusted to cause the engine to produce the required EGT or EPR at the RPM specified by the engine manufacturer.
Industry:Aviation
A maintenance procedure in which air is removed from the hydraulic fluid in an aircraft brake system. Air in the fluid will compress when the brakes are applied, and the brakes will feel spongy and will not be effective.
To bleed the brakes, a bleeder hose is installed in the brake cylinder, and fluid is pumped through the system until no trace of bubbles appears in the fluid.
Industry:Aviation
A maintenance procedure that corrects a magnetic compass for deviation error.
The aircraft is aligned on a compass rose, and the compensating magnets in the compass case are adjusted to get the compass to align with the direction marked on the rose. After the deviation error is minimized on all headings, a compass correction card is filled out and mounted on the instrument panel next to the compass.
Compass compensation is also called compass swinging.
Industry:Aviation
A maintenance procedure used with nickel-cadmium batteries to equalize all the cells. The battery is completely discharged, all of the cells are shorted, and the battery is allowed to stand in its shorted condition for a specified period of time. Then, the battery is recharged to 140% of its ampere hour capacity.
Industry:Aviation
A maintenance test performed by a technician to determine the condition of the fabric used to cover an aircraft. A special spring-loaded punch with a sharp point is pressed into the fabric, and the amount of force needed to cause the punch to make a specific size hole in the fabric is measured. The stronger the fabric, the more force is needed to make the hole.
A color-coded scale is used to indicate the condition of the fabric. Green means the fabric is good, yellow means that the strength of the fabric is questionable, and red means that the fabric is too dead to pass an airworthiness test. A fabric punch test is not an absolute indication of the strength of the fabric, but it is quick and accurate enough to determine the basic condition of the fabric.
Industry:Aviation
