Hangar 9 Alpha 40 ARF Assembly Manual page 16

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Step 18
The next step is to remove the backing from the hook and loop
material from the speed control and secure it to the battery
trays. This is tricky and will require patience to accomplish.

Step 19
Use the hook and loop straps to secure the motor battery
in the fuselage. If the battery slides forward or aft in the
fuselage, use a small piece of hook and loop tape between
the tray and battery to prevent it from doing so.
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Step 20
Use a hobby knife with a #11 blade to expose the two holes
for the fuselage hatch mounting screws.

Step 21
Slide the fuselage hatch in position on the fuselage. The
tabs will lock the front of the hatch in position. Slide a #4
washer on a 3mm x 12mm socket head screw. Place a drop
of threadlock on the screw. Use a 2.5mm hex wrench or ball
driver to tighten the screw. Use two screws and washers to
secure the hatch to the fuselage.

Step 22
On the bottom of the fuselage, right behind the rear window,
is an area that can be removed to provide cooling air to pass
through the fuselage to cool the motor battery. Removing
this covering is only necessary if you are not using the
newer Li-Po batteries capable of a 25C discharge rate.
Hangar 9 Alpha 40 ARF Assembly Manual