9 - Paint is new. Airframe and paint are in excellent condition with no scratches or dents.
8 - Paint and airframe are in near new condition. Minor scratches (shallow, short and fewer than one or two per square foot) are detectable only on close inspection (inspecting aircraft while standing at less than arm's length from it). Paint on often-used fasteners and screws may be chipped.
7 - Paint has high gloss. Small number (fewer than three or four per square foot) of scratches are apparent, mostly on leading edges due to abrasion. Close inspection reveals only a few small dents or chips (fewer than one or two per square foot). Windows are clear with no crazing or discoloring.
6 - Paint is shiny. Several small scratches, chips or dents (four to six per square foot) can be found, mostly around high-use areas (fuel caps, doors, struts). Some crazing or small stress cracks (fewer than two or three hairline cracks per square foot) are visible in plastic and fiberglass structures. Several windows may be milky at edges.
5 - Paint is sound (no corrosion apparent). Slight oxidation can be easily polished out, leaving paint shiny again. Two or three small areas (rounded corner of cowling, part of leading edge) of crazing can be found in paint. Paint on leading edges is rough from abrasion. Touched up or repaired areas may be seen on close inspection. Small number (three or four per square foot) of short cracks can be found in fiberglass wingtips and cowlings due to normal wear or hangar rash. Cowling seals are faded. Many (less than half) windows have milky edges. Several windows may be crazed or lightly scratched. Aircraft looks attractive to most people during a walk-around.
4 - Paint is generally sound. Small areas require special attention (touch up or repaired by trained individual) due to oxidation, peeling, chipping, corrosion or crazing. Paint is dull in many (less than half) areas. Most windows are crazed and scratched.
3 - Paint is not shiny and has peeled in many areas. Most leading edges and upper surfaces are crazed and oxidized. Moderate number (five or six per square foot) of chips, cracks or dents can be found. All window surfaces are scratched. Even after touch-up and polishing, aircraft still looks unsightly.
2 - Aircraft looks terrible. Paint is badly oxidized, peeled and blemished. It is well beyond the tough-up and polish stage. Corrosion, dents and cracks require extensive work.
1 - Exterior is so full of corrosion, heavy dents or tears that it will not pass an annual inspection without repairs.
BLUEBOOK AIRCRAFT RATING SCALE INTERIOR
10 - Aircraft is new.
9 - Interior is new. There are no scratches, cracks, crazing or other evidence of use.
8 - Interior is in near new condition. Any smell, dirt or matting can be removed by simple cleaning. Some evidence of use can be found only on close inspection.
7 - A small amount of wear is apparent. Small, shallow scratches and stains (one or two per seat) can be found on seats, carpet or woodwork. Stain remover and shampoo removes almost all stains. Headliner is clean with no stains. There are no nicks in woodwork.
6 - Headliner may have a couple of dirty spots that can be removed almost completely with cleaning. Matting in high-use areas does not vacuum out completely. Steaming or shampooing improves interior considerably, but a couple of small, limited areas (doorways, beneath rudder pedals) remain looking worn or stained. No frayed or torn fabric is apparent. Leather, vinyl or woodwork has no cracks, but small scratches or creases (four to six per seat) are obvious. Seats and drawers operate smoothly. Scratches in scuff plates around doorways are obvious. Interior still looks attractive when cleaned thoroughly.
5 - High-use areas (doorway, beneath rudder pedals) still look worn (fibers appear shorter than surrounding carpet) after thorough shampooing. Headliner may have several stains but is not torn. Minor (two or three instances per seat) fraying, staining or cracking is apparent on less than half of the seats. Small nicks are visible in woodwork. About one-third of the seats and drawers do not operate smoothly. Interior can be made to look clean, but it lacks sparkle in many areas.
4 - Scratches, stains and frayed fabric are seen on most seats. More than half of the leather or vinyl seats may have small cracks. Carpet is matted along aisle. Carpet also has numerous stains, snags or other irregularities. Interior has two or three tears. About half of the seats and drawers do not operate smoothly. Wood laminates may be peeling slightly. Several cracks in scuff plates around doorways are obvious. Interior cannot be made to look clean or smell fresh.
3 - Tears, snags and stains are clearly visible in many areas. Several cigarette burns can be found. Most seats and drawers do not operate smoothly. Interior looks and smells dirty even after cleaning.
2 - Cracks, stains, tears and snags are the norm. Many seats have exposed foam. Interior is dirty and foul-smelling even after a thorough cleaning.
1 - Interior is so dirty and worn that most people would be hesitant about sitting down for fear of damaging their clothing.