philosophy must exist for all products. The descriptions, procedures
and spare parts in the maintenance manual must be based on the chosen
In short, this philosophy must answer the following
- Who will do the preventive maintenance?
- Who will do the corrective maintenance?
- What level of skill, education and experience is required by the
personnel to do the preventive and corrective maintenance?
- To which maintenance level will the personnel do repair
and/or parts replacement?
Normally, three levels of maintenance are defined:
- Organizational level
- Intermediate level
- Depot level
This level only includes an overall
description of the system. The maintenance personnel are only permitted
to replace fuses, fans, filters and other expendables, and will only
perform the basic preventive maintenance. We do not expect the reader
to use any special tools or instruments.
All major repairs must
be carried out by the manufacturers or one of our authorized dealers.
This level includes a relatively detailed
description of the product. The manual must include an overall functional
and physical block diagram, and also descriptions and block diagrams
of the circuit diagrams and modules. The product's built-in test equipment
(BITE) system (if applicable) must be explained, and the required
maintenance procedures included accordingly. All required cable and
interconnection diagrams must be included in the manual.
of fault symptoms, troubleshooting flow charts or similar methods
for corrective maintenance may be used if possible. However, it is
our belief that troubleshooting is best supported by a combination
of the product's BITE system and the personnel's general skill and
We expect the reader to be an engineer or
technician, and that he/she has the use of multimeters and oscilloscopes.
He/she is permitted to carry out off-line tests (BITE and operational
specifications), and to replace circuit boards and modules.
This level is some times referred to as PCB Documentation
. The depot level documentation allows the reader to carry out
repairs to the circuit boards and modules.
level is normally only implemented for defence deliveries, and then
as separate instruction manuals.
We expect the reader to be
a skilled and experienced engineer or technician, and that he/she
has the use of multimeters and oscilloscopes.