For ongoing maintenance of aircraft, aircraft hangars shall be available and large enough to accommodate aircraft during maintenance activities.
Where the hangar is not owned by the AMO, it is recommended to:
Establish proof of authorisation to use hangar;
Demonstrate sufficiency of hangar space to carry out planned base maintenance by preparing a projected aircraft hangar visit plan relative to the maintenance programme;
Update the aircraft hangar visit plan on a regular basis;
Ensure, for aircraft component maintenance, aircraft component workshops are large enough to accommodate the components on planned maintenance;
Ensure aircraft hangar and aircraft component workshop structures prevent the ingress of rain, hail, ice, snow, wind and dust, etc.;
Ensure workshop floors are sealed to minimise dust generation; and
Demonstrate access to hangar accommodation for usage during inclement weather for minor scheduled work and/or lengthy defect rectification.
Aircraft maintenance staff shall be provided with an area where they may study maintenance instructions and complete maintenance records in a proper manner.
Note: It is acceptable to combine any or all of the above requirements into one office subject to the staff having sufficient room to carry out assigned tasks.
Hangars used to house aircraft together with office accommodation shall be such as to insure a clean, effective and conformable working environment.
Temperatures should be maintained at a comfortable level.
Dust and any other airborne contamination should be kept to a minimum and not permitted to reach a level in the work task area where visible aircraft/component surface contamination is evident.
Lighting should be such as to insure each inspection and maintenance task can be carried out.
Noise levels should not be permitted to rise to the point of distracting personnel from carrying out inspection tasks. Where it is impractical to control the noise source, such personnel should be provided with the necessary personal equipment to stop excessive noise causing distraction during inspection tasks.
Where a particular maintenance task requires the application of specific environmental conditions different to the foregoing, then such conditions shall be observed. (Specific conditions are identified in the approved maintenance instructions.)
Where the working environment for line maintenance deteriorates to an unacceptable level with respect to temperature, moisture, hail, ice, snow, wind, light, dust/other airborne contamination; the particular maintenance or inspection tasks shall be suspended until satisfactory conditions are re-established.
For both base and line maintenance where dust or other airborne contamination results in visible surface contamination, all susceptible systems shall be sealed until acceptable conditions are re-established.
Storage facilities for serviceable aircraft components shall be clean, well ventilated and maintained at an even dry temperature to minimise the effects of condensation.
Manufacturer and standards recommendations shall be followed for specific aircraft components.
Storage racks shall provide sufficient support for large aircraft components such that the component is not distorted.
All aircraft components, wherever practicable, shall remain packaged in protective material to minimise damage and corrosion during storage.
14 CFR 145.103
FAA Order 8900.1, Vol. 2, Chapter 11, Section 5 and Vol., 6, Chapter 9, Section 8
IS: 188.8.131.52 Equipment, Tools, and Material
All applicable tools, equipment, and test equipment used for product acceptance and/or for making a finding of airworthiness shall be traceable to the [STATE] National Standards.
Except as provided in paragraph (a), in the case of foreign manufactured tools, equipment, and test equipment, the standard provided by the county of manufacture may be used if approved by the Authority.
Where the manufacturer specifies a particular tool, equipment, or test equipment then that tool, equipment, or test equipment shall be used unless the manufacturer has identified the use of an equivalent.
Except as provided in paragraph (c), tools, equipment, or test equipment other than that recommended by the manufacturer will be acceptable based on at least the following:
The AMO shall have a procedure in the Maintenance Procedures Manual if it intends to use equivalent tools, equipment, or test equipment other than that recommended by the manufacturer.
The AMO shall have a programme to include:
A description of the procedures used to establish the competence of personnel that make the determination of equivalency to tools, equipment, or test equipment.
Conducting and documenting the comparison made between the specification of the tool, equipment or test equipment recommended by the manufacturer and the equivalent tool, equipment, or test equipment proposed.
Ensuring that the limitations, parameters, and reliability of the proposed tool, equipment, or test equipment are equivalent to the manufacturer's recommended tools, equipment, or test equipment.
Ensuring that the equivalent tool, equipment, or test equipment is capable of performing the appropriate maintenance function, all normal tests, or calibrations, and checking all parameters of the aircraft or aeronautical product undergoing maintenance or calibration.
The AMO shall have full control of the equivalent tool, equipment, or test equipment (i.e., ownership, lease, etc.)
An AMO approved for base maintenance shall have sufficient aircraft access equipment and inspection platforms/docking such that the aircraft may be properly inspected.
The AMO shall have a procedure to inspect/service and, where appropriate, calibrate tools, equipment, and test equipment on a regular basis and indicate to users that an item is within any inspection or service or calibration time limit.
The AMO shall have a procedure if it uses a standard (primary, secondary or transfer standards) for performing calibration, to ensure that standard cannot be used to perform maintenance.
A clear system of labeling all tooling, equipment and test equipment shall be used to give information on when the next inspection or service or calibration is due, and give status information if the item is unserviceable for any other reason where it may not be obvious.
A clear system of labeling all tooling, equipment, and test equipment shall be used to give information on when such tooling, equipment, and test equipment is not used for product acceptance and/or for making a finding of airworthiness.
A register shall be maintained for all calibrated tools, equipment and test equipment together with a record of calibrations and standards used.
Inspection, service, or calibration on a regular basis shall be in accordance with the equipment manufacturers' instructions except where the AMO can show by results that a different time period is appropriate in a particular case and is acceptable to the Authority.
14 CFR 145.109
FAA Order 8900.1, Vol. 2, Chapter 11, Section 5