b. Attach spacer pad(s) to an earcup with the hook side of the pad facing
the pile fastener on the earcup. Ensure that the fasteners are firmly
attached. Repeat for the other earcup.
3. Don the helmet, tighten the chinstrap, and recheck the earseal compression.
Add more spacer pads if needed until earseals are sufficiently compressed
and a uniform, comfortable earcup fit is attained.
Adjustment #3: TPL Custom-Fitting
If the helmet does not fit properly, i.e. it has hot spots or pressure points or the fit
is too tight or too loose, remove the helmet and custom-fit the TPL following the
Custom-Fitting Procedure below.
Tools and Equipment Required
1. Oven - Capable of stabilized sustained temperature of 200°F ± 5°F
(93.3°C ± 2.8°C) with thermometer and internal volume of approximately 1.5
cubic feet or equivalent
2. Ruler
3. Timer or equivalent
4. Masking Tape
STEP RESULT/REMARKS
1. Set oven rack to lowest position; heat
oven to 200°F ± 5°F (93.3°C 2.8°C).
- Ensure oven stabilizes at
approximately 200°F.
- Do not remove TPL cover; heat as a
unit.
2. Place TPL fabric side down in
center of rack in heated oven.
CAUTION
ENSURE THAT NO UPPER BURNER
ACTIVATES DURING HEATING, OR
TPL PLASTIC LAYERS WILL MELT.
- Preview Steps 5 through 10 so that
they may be completed within 30
seconds.
3. Allow oven to stabilize at temperature
listed in Step 1 before starting timed
sequence.
- In helmet, cover hook fasteners on
rear of energy-absorbing liner with
masking tape to ease TPL positioning.
4. Heat TPL for approximately 10
minutes.
- Set timer, stopwatch, or equivalent.
- Check TPL every two or three minutes
to ensure plastic layers are not
melting.
- Describe procedure to crewmember
being fitted.
5. Remove TPL from oven. - Steps 5 - 10 should be completed
within 30 seconds.
10
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