Urgent action TDs are issued under the governing
factors of combat necessity or hazardous conditions
that could result in injury to personnel, damage to
valuable property, or unacceptable reductions in
operational efficiency. These safety and material risks
are acceptable only within definite time limits. When
compliance is not accomplished within these time
limits, urgent action TDs require that affected aircraft
be grounded, and that the use of any missiles,
munitions, equipments, or materials involved be
Routine action TDs are used to authorize,
accomplish, or modify only. They are issued when
conditions embody risks acceptable within broad time
limits. If uncorrected, these conditions could
constitute a hazard through prolonged use, have a
negative effect on operational efficiency, reduce
tactical or support utility, or reduce operational life or
general service use of systems or equipment. Routine
action is not assigned to bulletins.
Record Purpose is used to confirm a modification
that has been completely incorporated by the
contractor or in-house activity in all accepted
equipment (before issuance of the TD). This category
is not used to formalize interim changes, assign
message TDs, or to assign bulletins.
What are the two methods of updating a technical
Define a rescission.
How long should an activity maintain a TD on
How are TDs cancelled?
What activity assigns the numbers for changes
When an uncorrected, unsafe condition exists
that could result in serious injury to personnel or
damage or destruction of property, what
category of TD is issued?
What category of technical directive is issued to
complete an action that, if uncorrected, could
constitute a hazard through prolonged use?
What category of TD is used to confirm that a
modification has been completely incorporated
by the contractor or in-house activity in all
LEARNING OBJECTIVE: Recognize the
procedures followed by central and dispersed
The aeronautical technical publications library
(TPL) serves two important functions. First, it serves
as a centralized source of up-to-date information for
all mechanics and technicians. Second, it gives all
personnel an excellent source of reference material to
help with personal training and individual
improvement. To do the job, the TPL contains copies
of all technical manuals that apply to an activitys
assigned aircraft, its related systems and equipment,
and the level of maintenance involved.
Each aviation maintenance activity operates TPL
services to support local operations and maintenance.
A central TPL (CTPL), once established, controls
technical publication activities within the command.
This includes the setting up and operation of dispersed
libraries. The QA division has overall management
responsibility for the technical library. The paragraphs
that follow discuss the functions of the central and
When an activity needs more than one library, it
sets up a CTPL. This CTPL manages the technical
publications in the activity. The CTPL is responsible
for determining the activitys publication needs. The
CTPL also procures and distributes publications and
provides for the security, maintenance, and updating
of all the technical publications. The CTPL is the
activitys point of contact with NATSF and Naval
Aviation Supply Office (ASO).
When an activity with a central library has other
technical libraries within the command, these other
libraries are called dispersed technical publications
libraries (DTPL). The CTPL manages these dispersed
libraries. The CTPL also provides initial outfitting and
issues updated material to DTPLs. The CTPL holds
the DTPLs responsible for the storage and availability
of publications that it issues to them. If a DTPL needs
additional information on a subject or technical