An ADR is used to report critical, major, or minor discrepancies. Definitions of critical, major, and minor deficiencies are as follows: A critical defect constitutes hazardous or unsafe condition (or as determined by experience and judgement could conceivably become hazardous and unsafe), thus making an aircraft unsafe for flight or endangering operating personnel. A major defect is a defect that could result in failure or materially reduce usability of the unit for its intended purpose. A minor defect is a defect that is not likely to materially reduce usability of the unit or product for its intended purpose or departs from established standards. Submit the required ADR within 5 working days after completion of an acceptance flight. A supplemental ADR, if any, must be submitted within 30 days of completion of the acceptance check flight. Submit a negative response if no discrepancies are found. State “No Discrepancies Noted, Reply Not Required” in Block 22 of Standard Form 368. Use the preaddressed envelopes that should be in the manila envelope in each aircraft logbook. Refer to OPNAVINST 4790.2 for more information on ADRs. ENGINEERING INVESTIGATION (EI) An engineering investigation (EI) provides an investigative process to determine cause of an aircraft mishap, lightening strike, weapon system and equipment failure, or fleet-wide material problem. An EI is submitted in support of the investigation. An EI should be submitted whenever the following circumstances exist: Safety is involved. This includes an EI request that is prepared in conjunction with an aircraft mishap and an HMR when an unsafe condition exists Additional technical or engineering information is required to complete an aircraft mishap investigation. Aircraft readiness is seriously impaired due to poor material reliability. A component is rejected through the Naval Oil Analysis Program (NOAP) after all authorized repairs are attempted. An environmental issue requires a change in material or process that is in conflict with a material or process that is specified in an existing publication or TD. Higher authority directs that the investigation be conducted. Unless combined with an HMR, an EI request should be submitted by routine priority message within 5 working days after discovery of the deficiency. A combined report follows HMR reporting criteria. Refer to OPNAVINST 4790.2 for handling and preparation of EI material. TECHNICAL PUBLICATION DEFICIENCY REPORT (TPDR) A technical publication deficiency report (TPDR) is a simplified method for reporting a safety hazard or routine deficiency in a technical publication. Technical publications where TPDRs can apply include MRCs, checklists, WUC manuals, shop process cards, MIMs, weapon loading manuals, stores loading manuals, conventional weapon checklists, nuclear weapon checklists, stores reliability cards, IPB listings, TDs, and technical manuals. The TPDR is the NAMDRP report that the CTPL will be most concerned with since the CTPL librarian submits and monitors this report. Some routine deficiencies may not require issuance of a change for immediate corrective action. Other deficiencies are critical and may, if not corrected, cause serious injury or death to personnel, loss of equipment, or damage to personal or government property. Some of the more common deficiencies include the following: Incorrect operating or troubleshooting proce- dures Incorrect or missing part numbers Format errors affecting maintenance Missing details Incorrect artwork NOTE: A deficiency or routine change recommendation in a Naval Air Training and Operating Procedures Standardization (NATOPS) manual or other tactical manual should be reported under the NATOPS/Tactical Manual Deficiency Reporting Program by submitting a NATOPS/Tactical Change Recommendation Form, OPNAV Form 3710/6. Instructions for processing OPNAV Form 3710/6 are 3-28