Maintenance Planning and Control part 3 & 4

Reference Lines

show the user the coordinates on the general configuration drawings of an aircraft from a predetermined origin to assist in locating equipment, assemblies, access doors, and panels.

Reference Lines

represent the distance in inches of the line from the origin.

origin

The ________ is a point located forward of the aircraft nose, slightly below the ground level and along the centerline. It is at the intersection of the FS datum line (FS 0.0), the aircraft centerline (BL 0.0), and the WL datum line (WL 0.0).

Fuselage Station (FS) lines

_________ are vertical reference lines, as viewed from the side of the aircraft. They show the distance from the datum line (FS 0.0) to a reference line.

Buttock Lines (BL)

__________ are vertical reference lines, as viewed from the front of the aircraft from which measurements left or right can be made. They are parallel to the aircraft centerline when viewed from the top. They show the distance from the aircraft centerline (BL 0.0) to a reference line.

Waterlines (WL)

_________ are horizontal reference lines, as viewed from the side or the front of the aircraft, usually located at the ground, cabin floor, or some other easily referenced location They show the distance above or below the datum line (WL 0.0) to a reference line.

Boom Station (BS) lines

_________ are reference lines perpendicular to the tail boom centerline when viewed from the side. They show the distance from the tail boom origin (BS 0.0) to a reference line. BS lines are all located aft of the tail boom origin and are all positive values.

Aileron Station (AS)

________ is measured outboard from, and parallel to, the inboard edge of the aileron, perpendicular to the rear beam of the wing

Flap station (KS)

________ is measured perpendicular to the rear beam of the wing and parallel to, and outboard from, the inboard edge of the flap.

Nacelle station (NC or Nac. Sta.)

________ is measured either forward of or behind the front spar of the wing and perpendicular to a designated water line

Zone or Zonal Station

________ is another method used to facilitate the location of aircraft components on air transport aircraft.

Access and Inspection Panel

Knowing where a particular structure or component is located on an aircraft needs to be combined with gaining access to that area to perform the required inspections or maintenance.

Time-in-Service (Flight Time)

The measured time that starts the moment aircraft leaves the ground and continues until it touches the ground at the next point of landing.

Operating Time

Actual flight time or calendar time that must be recorded in the Historical Service Records (HSR) or in the helicopter logs. The operating time is specified as Time-in-Service (Flight Time) and/or Calendar Time.

Cycle

equivalent to one start.

Functional Check

A quantitative check to determine if one or more functions of an item performs within specified limits.

Operational Check

A task to determine that an item is fulfilling its intended purpose. It does not require quantitative tolerances. This is a failure finding task.

Inspection

A non-destructive examination of a part, component, or system to verify its conformity to a specific standard.

Detailed Inspection

An intensive examination of a specific item, installation, or assembly to detect damage, failure, or irregularity. Available lighting is normally supplemented with a direct source of good lighting at an intensity deemed appropriate. Inspection aids such as mirrors, magnifying lenses, etc. may be necessary. Surface cleaning and elaborate access procedures may be required.

General Visual Inspection

__________ of an interior or exterior area, installation, or assembly to detect obvious damage, failure, or irregularity. This level of inspection is made from within touching distance, unless otherwise specified. A mirror may be necessary to enhance visual access to all exposed surfaces in the inspection area.

Special Detailed Inspection

An intensive examination of a specific item, installation, or assembly to detect damage, failure, or irregularity. The examination is likely to make extensive use of specialized inspection techniques and/or equipment. Intricate cleaning and substantial access or disassembly procedures may be required.

Zonal Inspection

A collective term comprising selected general visual inspections and visual checks that is applied to each zone, defined by access and area, to check system and power plant installations and structure for security and general condition.

Non-scheduled Inspection

An inspection that is not part of a schedule.

Scheduled Inspection

by interval, either calendar or time interval.

Pre-flight Inspection

prior to the first flight of day. Visual examining of the aircraft and operational checking of certain system and components to ensure there are no serious defect or malfunctions.

Thru-flight Inspection

________ in between flight inspection. Accomplished after each flight when a turn around sorties is scheduled. Checking for flight continuance by visual inspection of components and system to assure that no defect exist that will be detrimental for further flight.

Basic Post Flight Inspection

accomplished after the last flight of specified flying period.

Line Maintenance

task perform on the aircraft by a skilled technician by the use of basic tools such as servicing

Base Maintenance

task that is usually performed on an Approved AMO with special tools and equipment and released by specialized technicians.

On equipment

task perform on the aircraft

Off equipment

task that cannot be effectively accomplished on the aircraft, required the removal of the component for shop repair.

Continuing Airworthiness

The set of processes by which an aircraft, engine, propeller or part complies with the applicable airworthiness requirements and remains in a condition for safe operation throughout its operating life.

Modification

the alteration of an aircraft/aeronautical product in conformity with an approved standard.

Major modification

an alteration not listed in the aircraft, aircraft engine, or propeller specifications

Repair

the restoration of an aeronautical product to an airworthy condition to ensure that the aircraft continues to comply with the design aspects of the appropriate airworthiness requirements used for the issuance of the type certificate for the respective aircraft type, after it has been damaged or subjected to wear

Major repair

means a repair: (1) that if improperly done might appreciably affect weight, balance, structural strength, performance, power-plant, operations, flight characteristics, or other qualities affecting airworthiness; (2) that is not done according to accepted practices or cannot be done by elementary operations.

Preventative maintenance

Simple or minor preservation operations and the replacement of small standard parts, not involving complex assembly operations.

Overhaul

The restoration of an aircraft/aeronautical product using methods, techniques, and practices acceptable to the Authority, including disassembly, cleaning, and inspection as permitted, repair as necessary, and reassembly; and tested in accordance with approved standards and technical data, or in accordance with current standards and technical data acceptable to the Authority.

Aircraft

any machine that can derive support in the atmosphere from the reactions of the air other than the reactions of the air against the earth's surface.

Engine

A unit used or intended to be used for aircraft propulsion. It consists of at least those components and equipment necessary for the functioning and control, but excludes the propeller (if applicable).

Large airplane

an airplane of a maximum certificated take-off mass of over 5,700 kg.

Small airplane

an aeroplane of a maximum certificated take-off mass of 5,700 kg or less.

Master minimum equipment list (MMEL)

A list established for a particular aircraft type by the organization responsible for the type design with the approval of the State of Design containing items, one or more of which is permitted to be unserviceable at the commencement of a flight.

Minimum equipment list (MEL)

A list provides for the operation of aircraft, subject to specified conditions, with particular equipment inoperative, prepared by an operator in conformity with, or more restrictive than, the MMEL established for the aircraft type.