P-39

P-39 aircraft interior light for crew and service areas

The P-39 is an aircraft interior light used for local and general illumination inside airplanes and helicopters. It is installed in crew cabins, cargo compartments, technical spaces, service areas and crew workstations. The light is designed for onboard use, where compact size, vibration resistance and simple maintenance are important. In aircraft operation, the P-39 is not an external navigation light. It belongs to the internal lighting system and helps provide visibility for crew, maintenance access and compartment service work.

Cabin and compartment lighting function of the P-39

The main task of the P-39 is to illuminate working and service areas inside the aircraft. It can be used in the cockpit, navigator’s workplace, flight engineer area, cargo cabin, entrance zones, wardrobe areas, emergency exit zones and remote tail compartments. In technical areas, the light helps crews and maintenance personnel inspect equipment, wiring, pipelines and underfloor spaces. Depending on aircraft wiring, the P-39 may be switched manually or connected to local switches for automatic activation when a hatch or service panel is opened.

P-39 construction and light diffuser

The P-39 has a stamped metal housing, with the inner surface formed as a reflector. The light source is protected by a glass diffuser, which may be supplied in white matte or green versions depending on the installation purpose. The white diffuser is normally used for general illumination, while the green version may be used where softer, less disturbing cockpit or service lighting is required. During maintenance, the diffuser, lamp holder, reflector, contacts and housing condition should be checked.

Lamp holder and electrical design of the P-39

The P-39 uses a two-contact bayonet lamp holder fixed in the lamp-holder support. The light is designed for connection to the aircraft low-voltage DC electrical system, typically 24 V or 28 V depending on aircraft type. It is usually fitted with a small incandescent globe lamp. In modernized installations, LED replacement elements may be used only if they are allowed by the operator’s documentation and electrical compatibility requirements. Incorrect lamp power or poor contact can cause overheating, low light output or unstable operation.

P-39 in aircraft technical compartments

A common application of the P-39 is lighting of technical compartments and underfloor spaces. On some aircraft, lights of this type may be connected through a limit switch, such as VK-2-142G, so that the compartment is illuminated when a technical hatch is opened. This is practical for maintenance because technicians often work in narrow areas with limited natural light. In such applications, the reliability of the switch, wiring, lamp and mounting point is as important as the light unit itself.

Aircraft application of the P-39 interior light

The P-39 is used on many Soviet and Russian-designed aircraft and helicopters. It may be installed on transport, passenger and military aircraft, including An-12, An-24, An-26, An-30, An-72, An-74, Il-18, Il-76, Yak-40, Yak-42, Tu-134 and Tu-154. It is also used on helicopters such as Mi-8, Mi-14, Mi-24, Mi-26, Ka-27 and Ka-32 depending on configuration. Exact installation quantity and location should be checked by aircraft type and interior lighting documentation.

Supply and inspection of P-39

For procurement or replacement, the product should be specified as P-39 aircraft interior light, with diffuser color and lamp version confirmed in advance. The unit may be supplied new, from storage, repaired or serviceable depending on availability. Before installation, the housing, diffuser, lamp holder, contacts, mounting points and wiring connection should be checked. For aircraft use, passport, quality documents or acceptance documentation should be confirmed where required.

Product Type: Aircraft interior light / cabin light
Designation: P-39
Alternative Designation: П-39
Function: Interior illumination of crew, cargo, service and technical areas
Application / Where Used: Aircraft internal lighting systems
System / Installation Area: Cockpit, crew workplaces, cargo compartments, technical compartments, underfloor spaces, entrance zones and service areas
Housing: Stamped metal housing with internal reflector surface
Diffuser: Protective glass diffuser
Diffuser Versions: White matte or green depending on installation purpose
Lamp Holder: Two-contact bayonet holder fixed in lamp-holder support
Light Source: Incandescent globe lamp; LED elements may be used in modernized installations if approved
Nominal Voltage: 24 V / 28 V aircraft electrical system
Lamp Power: 10 W or 15 W depending on lamp type
Associated Switch: VK-2-142G limit switch may be used for automatic compartment lighting depending on aircraft wiring
Operating Features: Increased resistance to vibration and temperature variation
Compatible Aircraft / Equipment: An-12, An-24, An-26, An-30, An-72, An-74, Il-18, Il-76, Yak-40, Yak-42, Tu-134, Tu-154, Mi-8, Mi-14, Mi-24, Mi-26, Ka-27, Ka-32 depending on configuration
Typical Installation Locations: Ceiling panels, side panels, navigator / flight engineer work areas, cargo cabin, technical compartments, tail compartments, entrance doors and emergency exit areas
Condition: New / from storage / repaired / serviceable depending on availability
Inspection / Testing: Lamp check, contact check, diffuser inspection, housing inspection, mounting check and wiring connection check
Technical Documentation: Product passport, aircraft internal lighting documentation and quality documents as applicable

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Returns & Changes (Restocking Fee)
For selected items, a RESTOCKING FEE of 10% may apply in case of return, order cancellation, or changes to the order specifications. This condition applies only to certain products and is confirmed at the order approval stage.

Warranty
All products are covered by a standard 6-month warranty.
Extended warranty is available upon request and is agreed individually; it may affect the final product price.