Aviation Technical English for aircraft maintenance engineers (Авиационный технический английский язык для студентов-авитехников)

138 (a) For External Items: A thorough visual inspection of external structural items using concentrated lighting and workstands (inspections looking down from cherry pickers are not considered adequate) to gain proximity and looking for detailed condition, loose or missing attachments, cracks, wrinkles, distortions, flaking paints and misalignments, etc. (b) For Internal Items with external detectability: A thorough visual inspection of external structural items. This external inspection is directed by external evidence of internal damages, such as wrapage, wrinkled/ bulged/dented or canned skin, loose or missing fasteners, fluid or air stains, etc. When such evidence is found, thorough and extensive internal inspection has to be performed to determine if an internal damage exists. In all cases the follow-up internal inspection procedures are mentioned on the (external inspection) SIM page. Note: Proximity to the specific item permits physical contact. Removal of (detachable) parts to gain visual access may be required. Wiping or cleaning may be required in areas susceptible to problems. The cleaning process must have no detrimental effect on equipment. Use of aids, like magnifying glass and mirror may be required. TVCI: Thorough Visual Check Internal (structures only).Athorough visual check Internal of internal structural items using concentrated lighting. Parts that do not allow access to the inspection items have to be removed. Inspection items that cannot be fully examined in installed position have to be removed also for correct inspection. Note: Whenever a thorough visual inspection of internal structural items is specified, all system installations in the vicinity of the specific structural item shall receive a thorough visual check. Proximity to the specified item shall permit physical contact to determine item condition. Removal of detachable parts to gain access may be necessary. UTI: Ultrasonic Inspection . See NDT manual D6-37239 part 4. XRAY: X-Ray Inspection . See NDT manual D6-37239 part 2. WAC: Walk Around Check . A visual check from ground level for obvious discrepancies. A Zonal Walk Around Check ( ZWAC ) means, a WAC of or in a particular zone.