however, the items enclosed in quotation marks remain the same on every report. First, the abbreviated name of the controlling custodian of the aircraft that is being reported is entered. The next item is the word "XRAY." The third part of this line is the abbreviated name of the reporting custodian and detachment number, if applicable, of the aircraft that is being reported. Next, the serial number of the OPNAV XRAY message is entered. The report symbol follows the serial number. A typical subject line would read as shown below. SUBJ: LANT XRAY VP-5 099 5442-1 Item A—Bureau Number (BUNO). The BUNO of the aircraft that is being reported is entered here. This is important because the BUNO is the only single identification that is different for every aircraft in the Navy, regardless of type or model. The CNO maintains and controls the master BUNO register. Item B—Permanent Unit Code (PUC). The six-digit PUC that identifies the reporting custodian of the aircraft that is being reported is entered here. Each reporting custodian of aircraft has been assigned a PUC by the CNO, or, in the case of detachments, by the controlling custodian. Item C—Date of Action. The day, month, and year the action occurred is reported here. The day, month, and year is expressed as a six-digit number. For example, 21 March 1998 would be reported as 032198. Item D—Action Code. The Action code is a one-digit code that describes the particular action being reported. Action codes used for reporting a change in either reporting or controlling custody are A, F, G, R, and Y. Action codes used for reporting a change in status are E, H, L, M, S, and X. Permissible Action codes are shown in table 7-2. Permissible Action code/Status code combinations can be found in OPNAVINST 5442.2. Item E—Status Code. Reported under item E is the new Status code of the aircraft. If the action being reported does not involve a change in status, the current applicable Status code is entered. A Status code describes the condition of the aircraft. A complete list of authorized Status codes is shown in Table 7-3. Item F—Model Designation. The complete model designation of the aircraft being reported is entered here; for example, A-4E, F-14C and F/A-18D. Item G—Period Number. The period number represents the period in which the aircraft is serving (or last served, if not currently operating). The period num- ber changes only when an aircraft begins a new operat- ing period after standard rework or new production. Item H—Period End Date (PED). This element of information is related to item G above in that PED represents the date at which the period indicated in that item is scheduled to be (or was) completed. The period commences when the aircraft is first reported in status Axx following acceptance or rework. The month in which an aircraft is received from Naval Air Systems Command Fleet Support (NAVAIRSYSCOM FS) custody is counted as NO month in regard to operating period. The month in which an aircraft is predicted to return to NAVAIRSYSCOM FS custody is counted as 1 month. For example, an aircraft with an operating period of 24 months is received into an operating command from NAVAIRSYSCOM FS custody in June 1997. The predicted PED for this aircraft is June 1999. If extensions are granted on the service or period of an aircraft, the PED is not changed. A PED computation chart is shown in table 7-4. NOTE: The xx in above Status code stands for two digits that can further define the code. Item I—Extension Number. The number in this item pertains to extensions of the current tour or period only. Extensions granted on second or subsequent periods are renumbered. Extensions granted on second or subsequent periods have extension numbers that start with the number 01 in each period. Action code X is used to describe the initiation of extensions. Item J—Strike/Damage Code. If the action that is being reported involves the strike or damage of aircraft, the four-character Strike/Damage Code that describes the circumstance is entered in item J. NOTE: Strike is the official action that removes an aircraft from the list of Navy aircraft. See table 7-5 for Strike and Damage Codes. discussed in the following paragraphs. Categories 1 through 4 are used to describe the main reasons for which an aircraft can be stricken. Category 5 is used for substantially damaged aircraft that are repairable. Each category requires separate administrative procedures. These categories are Category 1—Damage. An aircraft is stricken in category 1 if the aircraft is lost or if the aircraft is damaged to such an extent that its restoration to serviceability would be uneconomica 1 or militarily impractical. This category is the one most often used by operating activities. 7-5