assembly must be removed. Hours or counts come from operating records that indicate elapsed time operated or counts (cycles run) on the equipment or aircraft. From these hours or counts, replacement due should be computed in accordance with procedures in the latest edition of OPNAVINST 4790.2. When computing replacement due, you should screen all portions of the ASR to determine what component has the least operating time remaining. Figures 6-13 and 6-14 show an ASR for a servo cylinder installed on BUNO 149725 with two components, the trunnion assembly and the housing assembly installed on the servo cylinder. The trunnion assembly is authorized 4,200 operating hours between overhauls and has accumulated no operating hours since overhaul, so the assembly can be operated for 4,200 hours. The housing assembly is authorized a total service life of 5,700 hours before it must be retired (discarded). The housing assembly has accumulated 4,000 hours and can now be operated for 1,700 hours. The servo cylinder is authorized 1,800 operating hours between overhauls and has accumulated zero operating hours. In this example, the housing assembly (1,700 hours) becomes the determining factor when the replacement due is computed. The 1,700 hours is added to the aircraft time-since new at the time of installation as follows: Aircraft Time Since New 8,975 Housing Assembly Operating Hours + 1,700 Replacement Due 10,675 In this example, the servo cylinder must be removed from the aircraft when the aircraft reaches 10,675 operating hours. In other words, the aircraft can operate for 1,700 hours after installation of the servo cylinder before the servo cylinder must be removed from the aircraft. Replacement intervals are outlined in applicable PMICs. Section I of the ASR is the Identification Data section. All blocks must be completed. Section II lists all life limited and forced removal subassemblies. The maximum flight hours or counts expended on any subassembly determine when a particular assembly must be removed. Section III is used to record installation of an assembly. When assemblies are installed, verify all existing entries for aircraft and equipment hours or counts and assembly hours or counts. Section IV records instances of removal. Ensure a reason for removal and a job control number (JCN) is entered in Block “D” of this section. This assists maintenance personnel in future repair or rework actions of the assembly. Section V is used to document TD installation and removal. Notice that the TD Identification section contains the same information as the “F” record of the MAF. Section VI contains Repair/Rework/Overhaul/ Exceedances data. Record all repair, rework, or overhaul actions in this section. Record any instances of exceedances during operation and the level of exceedance. Refer to the latest edition of the OPNAVINST 4790.2 for specific details and procedures for recording data in this section. Q22. An ASR is lost. What activity should you contact for information required to reconstruct a replacement ASR? EQUIPMENT HISTORY RECORD (EHR) CARD (OPNAV 4790/113) The Equipment History Record (EHR) Card (figs. 6-15 and 6-16) provides a method of monitoring specific maintenance data on maintenance engineering cognizant field activity (MECFA) designated components. The EHR card also tracks maintenance data for equipment that does not qualify as an SRC card item. Quick engine change kits (QECKs) and armament equipments are examples of EHR card equipment. An individual card for each EHR component is maintained as part of the aircraft logbook as long as the component is installed. When a component is removed from the aircraft, the EHR card should be closed-out, and the card should accompany the component. NOTE: Do not track SRCs with EHR cards. Loss of an EHR card does not prevent use of the component. Each MECFA is responsible for maintaining the history of EHR components. To accomplish this function, the user must forward canceled cards, copies of updated cards, and copies of new cards generated for EHR items to the appropriate MECFA. The respective MECFAs maintain this information and respond to requests for EHR data. SCHEDULED REMOVAL COMPONENT (SRC) CARD (OPNAV 4790/28A) The complete maintenance history, installation, and usage data for all items designated as scheduled removal components are recorded on the SRC card 6-24