7. ‘normally unoccupied space’ means a protected space that is occupied for limited periods only …

1.

On military ground vehicles

1.1.

For the protection of engine compartments

1.2.

For the protection of crew compartments

2.

On military surface ships

2.1.

For the protection of normally occupied machinery spaces

2.2.

For the protection of normally unoccupied engine spaces

2.3.

For the protection of normally unoccupied electrical compartments

2.4.

For the protection of command centres

2.5.

For the protection of fuel pump rooms

2.6.

For the protection of flammable liquid storage compartments

3.

On military submarines

3.1.

For the protection of machinery spaces

3.2.

For the protection of command centres

3.3.

For the protection of diesel generator spaces

3.4.

For the protection of electrical compartments

4.

On aircraft

4.1.

For the protection of normally unoccupied cargo compartments

4.2.

For the protection of cabins and crew compartments

4.3.

For the protection of engine nacelles and auxiliary power units

4.4.

For the inerting of fuel tanks

4.5.

For the protection of dry bays

5.

In land-based command and communications facilities essential to national security