(BURNTHROUGH TEST RIG)

1
Radiant Panel Test / Extended flame
time Equivalence between 25.856 and 25.853
CEAT (Aeronautical Test Centre of Toulouse)
2
Radiant Panel Test / Vertical Test
BACKGROUND

• Since 25.856 is applicable
• Materials for thermal acoustic insulation need
  to meet the 15s Radiant Panel Test requirements
  (whatever their beavior with Vertical Test)
• Materials for cabin layout still need to meet
  Vertical Test requirements (25.853)

3
Radiant Panel Test / Vertical Test
Some materials can be used both for thermal
acoustic insulation and for cabin layout
4
Radiant Panel Test / Vertical Test
Extending Flame time
In some cases, FAA has extended pilot flame time
up to 30s and thinks to extending it up to 60s.
Evolution of the rule permits some insulation
materials (which failed with the standard test)
to be OK with extended flame time test.
5
Radiant Panel Test / Vertical Test
? Questions ?
With these new test conditions
- Is Radiant Panel Test still more severe than
Vertical Test ?
- Is there a risk to accept for thermal acoustic
insulation (in hidden area) a material which is
forbidden for cabin layout ?
6
Radiant Panel Test / Vertical Test
Purpose of the study
Tested Materials

• Preliminary study to verify on few selected
  configurations if the equivalence between
  25.856(a) and 25.853(a) will still valid with
  this new test conditions

7
Radiant Panel Test / Vertical Test
Proceeding
1) Selection among already tested materials
(Radiant Panel Test) which was OK for the burn
length but not for the after flame time. 2) New
tests on these materials - Radian Panel Test
with an extended pilot flame time (30s and 60s) -
Vertical Test 12s and 60s
(Only 15s Radiant Panel Test has been tested with
3 samples, due to limited number of samples the
other cases has been conducted only on 1 sample)
8
Radiant Panel Test / Vertical Test
9
Radiant Panel Test / Vertical Test
10
Radiant Panel Test / Vertical Test
Burn lengths
Radiant Panel Test All burn lengths
0 Vertical Test All burn lengths meet the
requirement
11
Radiant Panel Test / Vertical Test
Test Results
12
Radiant Panel Test / Vertical Test
CONCLUSION
For the tested materials - Radiant Panel
Test is always more severe than Vertical Test -
Extended flame time does not systematically lead
to decrease after flame time. No inconsistency
between radiant panel test (with extended pilot
flame time) (25.856(a)) and Vertical Test
(25.853(a))
13
Radiant Panel Test / Vertical Test
THE END