Technical data

sheet taped on the area under inspection. The test area shall be
soaked for a 24 hours minimum, and shall have a minimum
diameter of 3 inches.
5.6.6.1.4.3 Remove the wet cloth and plastic sheet and
blot up the surface water. Immediately applya1inchstrip of
tape, PN 250, manufactured by 3M Company, (NSN 7510-
00-283-0612), age of tape not to exceed 3 years, adhesive
side down. Press the tape down, using two passes of a 4 1/2
pound rubber covered roller or employ firm pressure with the
hand.
NOTE
This tape is the only approved tape (no alterna-
tives or substitutes).
5.6.6.1.4.4 Remove the tape in one abrupt motion, and
examine the test area for any paint damage such as removal
of one of the layers of the finish system or removal of the
entire system from metal. Any removal constitutes failure of
the wet tape test.
5.6.6.1.4.5 Gloss shall be measured in accordance with
the general procedures described in Federal Test Method
Standard 141, Method 6101 and 6103, except that the
measurements will be made on flat or approximately flat
surfaces of the aircraft instead of a test panel. The test shall
be made on the complete exterior finish after drying for a
period of at least 24 hours in a sufficient number of areas to
assure that the required gloss has been obtained. See Table
5-3.
Table 5-3. Gloss Requirements
Gloss Meter Paint System
Degrees Reading Unit
60 Semi-gloss 35-45
60 High-gloss 90 Min
60 Gloss 80 Min
60 Camouflage 7 Max
60 and 85
*
Gunship
*
3 Max
(both)
*
Both Meters Required
5.6.6.2 Evaluation and classification of discrepancies for
complete aircraft painting.
5.6.6.2.1 The paint system, pattern, and markings shall be
in accordance with weapon system specific TO’s, aircraft
drawings, or other applicable directives, and Chapter 8 of this
manual.
5.6.6.2.2 Colors of camouflage pattern shall fade and
blend into each other with irregular lines of demarcation, with
no straight or sharp lines.
5.6.6.2.3 No color variation in any single color area of the
camouflage pattern or paint scheme when the surface is
viewed with the unaided eye from a distance of 50 feet is
allowed. Touch-up of the paint system to correct minor
discrepancies by the paint activity will produce some minor
color variation and is acceptable.
5.6.6.2.4 No more than 2 minor sags or runs per 50 square
feet of surface is allowed (a minor run is one which does not
exceed two inches in length).
NOTE
Slight orange peel appearance is inherent with the
PR-1434 GV polysulfide primer/MIL-PRF-
85285, Type I polyurethane paint system and is
acceptable.
5.6.6.2.5 The paint system shall pass the paint adhesion
wet tape test. Candidate test areas shall include the following
(where applicable): Upper center wing, left and right upper
inboard and outboard wing, left and right lower wing surface
(inboard and outboard), left and right horizontal stabilizer
surface (upper and lower), left or right side of vertical
stabilizer, cargo door, MLG pod, engine pylon, engine
nacelle, left and right side of fuselage forward and aft, lower
fuselage or belly (multiple sites shall be selected for this
area). Failure of this test includes peeling of topcoat to primer
as well as primer to bare metal.
5.6.6.2.6 Fifteen or more individual discrepancies, any
combination of discrepancies with a total area of 15 or more
square feet, or any one discrepancy with an area of 5 or more
square feet wrinkling, crazing, blistering, lifting, or pitting/
cupping as defined in this technical order or peeling of
topcoat to primer or primer to bare metal shall be reported as
a major defect. List all these discrepancies by number found
and type, area of each, and total area of all discrepancies.
NOTE
Failure of 25 percent of the wet tape adhesion
tests prescribed here shall be reported as major
defect. List all failures of this test by location on
the aircraft.
5.6.6.3 Frequency of Inspection. The quality control
plan and frequency of inspection shall be decided by local
quality control authority. For large surface painting (e.g., the
partial or complete repaint of an aircraft), a predetermined
number of tests may be applied to sampled areas of each item.
For subassembly and component painting, inspection of paint
shop workmanship may be covered by in-process inspection
or inspections of representative samples items according to a
sampling plan either on a time basis or production count
basis. Testing shall be kept to the minimum necessary to
determine acceptability of the finished work. System and
Item Managers have the option to specify a frequency of test
in technical orders or work specifications on their equipment.
TO 1-1-8
5-12