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 discontinued. 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. Q46. Q37. Q38. Q49. Q50. Q51. Q52. Q53. What  are  the  two  methods  of  updating  a  technical directive? Define  a  rescission. How long should an activity maintain a TD on file? How are TDs cancelled? What activity assigns the numbers for changes and  bulletins? 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 accepted   equipment? TECHNICAL  PUBLICATIONS LIBRARY PROCEDURES LEARNING  OBJECTIVE:  Recognize  the procedures followed by central and dispersed technical libraries. 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 activity’s 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 dispersed  libraries. CENTRAL TECHNICAL PUBLICATIONS LIBRARY (CTPL) 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 activity’s 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 activity’s point of contact with NATSF and Naval Aviation Supply Office (ASO). DISPERSED LIBRARY 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 2-33