MIL-DTL-25866C
2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event
of a conflict between the text of this document and the references cited herein, the text of this
document takes precedence. Nothing in this document, however, supersedes applicable laws and
regulations unless a specific exemption has been obtained.
3. REQUIREMENTS
3.1 First article. When specified (see 6.2), a sample shall be subjected to first article
testing in accordance with 4.2.
3.2 Components. The light shall consist of:
Item No.
Quantity
Description
Requirement
1
1
Housing
3.6
2
1
Base plate
3.7
3
1
Reflector
3.8
4
1
Lens
3.9
5
2
Lamp
3.10
6
1
Manual switch
3.11
7
1
Inertia switch
3.12
8
1
Power failure relay
3.13
9
4
Batteries
3.14
3.3 Materials.
3.3.1 Fungus-proof materials. Materials that are nutrients for fungi shall not be used
where it is practical to avoid them. Where used and not hermetically sealed, they shall be treated
with a fungicidal agent acceptable to the procuring activity. However, if they will be used in a
hermetically sealed enclosure, fungicidal treatment will not be necessary.
3.4 Design and construction. The light shall be designed and constructed so that no parts
will work loose in service. It shall be built to withstand the strain, vibrations, and other
conditions incident to shipping, storage, installation, and service.
3.4.1 Adjustment and repair. The light shall be so constructed that adjustments and
repairs (including replacement of lamp and batteries) can be made easily by the personnel of
operating units, with tools normally available commercially.
3.4.2 Installation. The light shall be designed for installation near each exit of the
aircraft cabin so that the light beam will be directed to illuminate the exit in an efficient manner.
All parts shall be suitably enclosed to prevent tampering or damage.
3.4.3 Portability. The light shall be so designed that it can be easily and quickly
removed from its mounting position. The device used to secure the light in its mounting position
shall hold the light in place during the conditions specified in 3.5.
3
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