of the aircraft for flight, verify proper servicing, and to detect degradation that may have occurred during the previous flight. The turnaround inspection is valid for a period of 24 hours, provided that no flight and no maintenance  other  than  servicing  occur  during  this period.  The  accomplishment  of  the  daily  inspection does not satisfy the turnaround requirements. On aircraft  that  are  furnished  turnaround  inspection requirements,   the   preflight   and   postflight requirements do not apply. Phase inspection. The phase maintenance concept divides the total scheduled maintenance requirements into small packages or phases of approximately the same work content. These are done sequentially at specified intervals. Completion of all required phases at  their  specified  intervals  completes  the  phase inspection cycle. The cycle is repetitive for the service life of the aircraft and is not interrupted during SDLM. Phase inspections are not included in the SDLM specifications, and are not done during the SDLM process.   Aircraft   returning   from   SDLM/special rework have the next phase due upon expiration of the authorized interval from the last phase inspection completed. Special  inspection.  A  special  inspection  is  a scheduled  inspection  with  a  prescribed  interval  other than daily or phase. These intervals are specified in the applicable PMS publication and are based on elapsed calendartime, flight hours, operating hours, or number of cycles/events; for example, 7, 28 days; 50, 100, 200 hours; 10, 100 arrestments; or 5,000 rounds fired. Zonal inspection. A zonal inspection is a general inspection of a specific area of an aircraft. These inspections are for obvious defects, such as leaks, frayed cables, cracks, corrosion, or physical damage. Zonal   inspections   are   normally   performed   in conjunction with other scheduled maintenance tasks by the rating assigned, such as an Aviation Electronics Technician  (AT)  rating  assigned  to  perform  an inspection on a radar antenna may also be assigned a zonal  inspection  of  the  compartment  for  obvious defects. NOTE:  You should refer to the Naval Aviation Maintenance   Program   (NAMP),   OPNAVINST 4790.2,  for  added  information  about  the  maintenance program  and  the  forms  and  records  used  in  the program. Q43. Q44. Q45. Q46. Q47. Q48. What type inspection is performed at the time a reporting custodian accepts a newly assigned aircraft? What type inspection is performed to check equipment that requires a daily verification of satisfactory   functioning. What type inspection is required as the result of a specific overlimit condition? A preflight inspection is valid for a period of how many  hours? What type inspection consists of checking the aircraft for fright readiness by performing visual examinations and operational tests to discover defects and maladjustments that, if not corrected, would cause accidents or aborted missions? What type inspections are normally performed in conjunction  with  other  scheduled  maintenance tasks by the rating assigned? SUMMARY This chapter identified the organization of the line division. Responsibilities and qualification of a plane captain  were  covered  but  were  not  all  inclusive. Special safety requirements and safety precautions for aircraft ashore and afloat were also mentioned. Special programs covered in this chapter touch on the basics. The information contained in these programs is more than any individual could be expected to memorize or be solely responsible for. You should keep informed of changes to programs at your command that might affect your work center. 5-33