Submitted specimens must
conform to very rigid specifications. Most of the tests are designed to utilize
a specific area for the apparatuses to determine the results.
All specimens must be
bundled in sets of four (4) and labeled. The tests commonly require only three
specimens to complete a test, however some specimens have certain explosive
characteristics. These characteristics might invalidate one sample and another
must be run in its place.
One set of four (4) specimens
is required for each surface " face" that needs testing.
One additional set of
four (4) specimens is required if the "face" is known to have isotropic
flame properties (such as fabrics, woven materials).
One set of four (4) is
required for flaming and one set of four (4) is required for non-flaming (smoke
density or, toxicity) if required.
Important note:
Each set of specimens must be accompanied by their own FAA Form 8130.3. Also, the specific
test required must be called out in an approved test plan. If these
two items are not met we can still test the specimens and issue preliminary
results. However, the results will not be certifiable to the FAA.
The following is for one
sample size, four of each should be provided. (for bunsen burner, heat release,
smoke density, 4 for each mode required - Flaming/Non-Flaming)
TYPE OF TEST:
|
SIZE
REQUIREMENTS:
(4 each) |
ALLOWABLE
TOLERANCES: |
12 second vertical
bunsen burner |
3"
X 12 " |
unspecified |
60
second vertical
Bunsen burner |
3"
X 12 " |
unspecified |
Horizontal
Bunsen burner |
3"
X 12 " |
unspecified |
45
degree Bunsen burner |
12"
X 12" |
unspecified |
60
degree wire
Bunsen burner |
35"
length |
unspecified |
Heat
release rate |
5.94"
X 5.94" |
+0"
/ -0.06" |
Smoke
density |
2.9"
X 2.9" |
+0"
/ -0.06" |
Smoke
density
electrical wire |
10'
length |
unspecified |
Toxicty
(non-FAA required) |
2.9"
X 2.9" |
+0"
/ -0.06" |
Printed
Circuit Board
(Airbus Specific)** |
4.9"
X 6.7" |
unspecified |
Wire
/ Cable
(Smoke & Toxicity) |
10'
(16 AWG and smaller)*** |
unspecified |
Flame
Propagation
(Thermal/Acoustic) |
12.5"
X 23" |
unspecified |
Flame
Propagation
(Ridged Core) |
11.5"
X 23" |
+0.25"
/ -0.25" |
Flame
Propagation
(Hook/Loop) |
4.25"
X 12" |
+0.25"
/ -0.25" |
Flame
Propagation
(Tape) |
Put the initial edge of the first 2" strip of tape 2.25" away from the right edge. |
AC25.856-1 par. 5 b. (2) |
Flame
Propagation (Damping) |
7.125" X 12". |
AC25.856-1
par. 7 f. (2) |
** Airbus states that the entire printed circuit board must be tested, not
just a representative sample. If the printed circuit board is larger that
the required size, than it is best to cut the board into equal size pieces
that are 4.9" X 6.7" or smaller. Each piece of the entire board
must be tested and then averaged as one of three samples. As an example: if
you have a printed circuit board that is 9" X 9" you need three
of these boards and then cut each one into a 4.5"X 4.5" piece (sample1a
and 1b). You would ship us a total of 6 pieces (a set of 3 for sample PCB-1a
and a set of 3 for sample PCB-1b).
*** For wires larger that 16 AWG and all multistrand cables the formula for
quantity is 27/dia" = length in inches per mode. Example, cable diameter
is 0.22" then 27/0.22=123" per mode (flaming / nonflaming)
|